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Author : Vincent W. S. Chan
Publisher :
ISBN 13 :
Total Pages : 129 pages
Book Rating : 4.:/5 (217 download)
Download or read book Characterization of Measurements in Quantum Communication written by Vincent W. S. Chan and published by . This book was released on 1975 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Vincent Wai-Sum Chan
Publisher :
ISBN 13 :
Total Pages : 550 pages
Book Rating : 4.:/5 (241 download)
Download or read book Characterization of Measurements in Quantum Communications written by Vincent Wai-Sum Chan and published by . This book was released on 1974 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Vladimir B. Braginsky
Publisher : Cambridge University Press
ISBN 13 : 9780521484138
Total Pages : 216 pages
Book Rating : 4.4/5 (841 download)
Download or read book Quantum Measurement written by Vladimir B. Braginsky and published by Cambridge University Press. This book was released on 1995-05-25 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an up-to-date introduction to the quantum theory of measurement. Although the main principles of the field were elaborated in the 1930s by Bohr, Schrödinger, Heisenberg, von Neuman, and Mandelstam, it was not until the 1980s that technology became sufficiently advanced to allow its application in real experiments. Quantum measurement is now central to many ultra-high technology developments, such as "squeezed light," single atom traps, and searches for gravitational radiation. It is also considered to have great promise for computer science and engineering, particularly for its applications in information processing and transfer. The book begins with a brief introduction to the relevant theory and goes on to discuss all aspects of the design of practical quantum measurement systems.
Author : Osamu Hirota
Publisher : Springer Science & Business Media
ISBN 13 : 1461559235
Total Pages : 521 pages
Book Rating : 4.4/5 (615 download)
Download or read book Quantum Communication, Computing, and Measurement written by Osamu Hirota and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 521 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the proceedings of the Third International Conference on Quantum Communication and Measurement. The series of international conferences on quantum communication and measurement was established to encourage scientists working in the interdisciplinary research fields of quantum communication science and technology. The first such conference, organized by C. Benjaballah and O. Hirota under the title "Quantum Aspects of Optical Communication," assembled approximately 80 researchers in Paris in 1990. The second conference, held in Nottingham in 1994, was organized by V. P. Belavkin, R. L. Hudson, and O. Hirota and attracted about 130 participants from 22 countries. The present conference, organized by O. Hirota, A. S. Holevo, C. M. Caves, H. P. Yuen, and L. Accardi, was heldSeptember 25-30, 1996, in Fuji-Hakone Land, Japan, andjnvolved about 120 researchers from 15 countries. The topics at this third conference included the foundations of quantum communi cation and information theory, quantum measurement theory, quantum cryptography and quantum computation, quantum devices and high-precision measurements, gener ation of nonclassical light, and atom optics. Special emphasis was placed on bringing together research workers in experimental and engineering fields of quantum commu nication and quantum computing and theoreticians working in quantum measurement and information theory. Nineteen plenary and parallel sessions and one poster ses sion were organized, at which a total of 82 papers were presented. Interesting and stimulating scientific discussions took place between and after sessions as well as in the evenings.
Author : Paolo Tombesi
Publisher : Springer Science & Business Media
ISBN 13 : 0306471140
Total Pages : 472 pages
Book Rating : 4.3/5 (64 download)
Download or read book Quantum Communication, Computing, and Measurement 3 written by Paolo Tombesi and published by Springer Science & Business Media. This book was released on 2007-05-08 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains contributions based on the lectures delivered and posters presented at the Fifth International Conference on Quantum Communication, Measurement and Computing (QCM&C-Y2K). This Conference is the fifth of a successful series hosted this time in Italy, was held in Capri, 3-7 July, 2000. The conference was attended by more than 200 participants from all over the world. There was also a high level of participation from graduate students, who greatly benefited from the opportunity to attend world-class conferences. The Conference Hall was hosted in La Residenza Hotel in Capri, where part of p- ticipants where housed, while others where housed in various cozy nearby - tels. All enjoyed the pleasant atmosphere offered by the island of Capri. There were 59 invited lectures given as oral presentations of 30 minutes and 94 poster papers. The major topics covered at the Conference where new experimental and theoretical results in quantum information. They were divided in five parts; i) Quantum Information and Communication, ii) Quantum Measurement, - coherence, and Tomography, iii) Quantum Computing, iv) Cryptography, v) Entanglement and Teleportation. We were lucky in that almost all major - perimental groups in the world working in this area were represented, as were the major theoreticians. There was very active audience participation. A n- ber of graduate students and post-docs were able to present their contributions in four after dinner poster sessions.
Author : Prem Kumar
Publisher : Springer Science & Business Media
ISBN 13 : 0306470977
Total Pages : 527 pages
Book Rating : 4.3/5 (64 download)
Download or read book Quantum Communication, Computing, and Measurement 2 written by Prem Kumar and published by Springer Science & Business Media. This book was released on 2007-05-08 with total page 527 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on the Fourth International Conference on Quantum Communication, Measurement and Computing, this volume brings together scientists working in the interdisciplinary fields of quantum communication science and technology. Topics include quantum information theory, quantum computing, stochastic processes and filtering, and quantum measurement theory
Author : Akira Sone (Ph. D.)
Publisher :
ISBN 13 :
Total Pages : 165 pages
Book Rating : 4.:/5 (113 download)
Download or read book Quantum System Identification by Local Measurements written by Akira Sone (Ph. D.) and published by . This book was released on 2019 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum information processing, including quantum computation, quantum communication, and quantum metrology, is expected to be the next-generation information technology capable of outperforming classical devices. The physical platform for quantum information devices requires many-body quantum systems with many interacting qubits (two-level systems), and several experimental systems have been actively studied in recent years for realizing such scalable quantum information processors. Reliable quantum information processing essentially requires robust initialization of the quantum system, robust control protocols and precise measurement. As these indispensable tasks strongly depend on the physical properties and dynamics of the quantum system, the precise characterization of the experimental system, namely quantum system identification, is a crucial prerequisite. In a closed quantum system, the Hamiltonian includes the information about the properties of the system, such as the number of qubits, single-body energy of qubits, topology of qubit network graph and coupling types between qubits. For thermal equilibrium state, the temperature also becomes an important parameter characterizing the thermal properties of the system. Quantum system identification aims at extracting these elements from measurements of the system dynamics or state. However, performing measurement over the whole many-qubit system is typically a demanding task in the laboratory. Furthermore, given the lack of knowledge about the system, one cannot control or measure the system with high accuracy before characterizing it. Thanks to recent advances in quantum metrology with a single qubit sensor, a well-characterized qubit system can play the role of a quantum probe, which is coherently coupled to the target system, thus enabling practical schemes to identify the target many-body quantum system indirectly through system-probe correlations. More broadly, this quantum probe strategy is an example of system identification performed via local measurements. This thesis focuses on the role of quantum correlations in quantum system identification assisted by local measurements in two different regimes: (1) dynamical and (2) equilibrium regime. In the dynamical regime, we introduce the mathematical concept of quantum system identifiability with respect to Hamiltonian parameter identification and Hilbert space dimension identification. Exploiting the linearity of the dynamics, we employ linear system realization theory, algebraic geometry and graph-theory to analyze the identifiability of an unknown Hamiltonian or the dimensions of the Hilbert space of the target many-body quantum system. Based on the formalism, we propose practical algorithms for both identifiability problems. We further find that propagation of correlations between the quantum probe and the whole system is a necessary condition to fully identify the parameters and dimensions of the target system through local measurements on the quantum probe. In the equilibrium regime, the thesis discusses the problem of estimating either the temperature or Hamiltonian parameters, which can in general be extracted by characterizing the thermal equilibrium state. We discuss a general local measurement scheme, which we call "greedy local measurement scheme", where one performs sequential optimal measurement on a complete set of subsystems. We introduce a practical measure of nonclassical correlations, called discord for local metrology, to measure the nonclassical correlations induced by local optimal measurements. By comparing the greedy local measurement scheme and global measurement scheme, we explicitly demonstrate that in the high-temperature limit discord for local metrology quantifies the ultimate precision limit loss in local metrology. Conversely, this shows that nonclassical correlations could contribute to sensitivity enhancement in parameter estimation even at thermal equilibrium. These results can be expected to contribute to the characterization of near-term quantum information processors, such as Noisy Intermediate-Scale Quantum (NISQ) devices, and to find applications in quantum sensing, e.g. in room-temperature nanoscale magnetic resonance sensing of nuclear spins in molecules or imaging of biological complex systems.
Author : V.P. Belavkin
Publisher : Springer Science & Business Media
ISBN 13 : 9780306451287
Total Pages : 578 pages
Book Rating : 4.4/5 (512 download)
Download or read book Quantum Communications and Measurement written by V.P. Belavkin and published by Springer Science & Business Media. This book was released on 1995-08-31 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Workshop on Quantum Communications and Measurement was held at the University of Nottingham from July 10-16, 1994. It followed the successful meeting on Quantum Aspects of Optical Communications in Paris in November 1990. This time the conference was devoted to mathematical, physical and engineering aspects of quantum noise, signal processing and quantum informa tion in open systems, quantum channels, and optical communications. It brought research workers in the experimental and engineering aspects of quantum optics and communication systems into contact with theoreticians working in quantum probability and measurement theory. The workshop was attended by more than 130 participants from 22 different countries. The largest groups [after the UK (31)] were from Japan (19) and from Russia (14). The subjects discussed included the mathematical foundations of quantum communication systems, experiments and devices, the problem of collapse and continuous measurement, quantum input and output processes, causality and nondemolition observation, squeezed states, quan tum jumps, state diffusion and spontaneous localization, filtering and control in quantum systems, and new quantum optical phenomena and effects, including non classical light. These new mathematical and physical ideas were stimulated by recent advances in generation and detection of light with low quantum noise and the development of techniques for trapping a single atom over an extended period of time, making it possible to observe individual quantum phenomena at the macroscopic level.
Author : V.P. Belavkin
Publisher : Springer Science & Business Media
ISBN 13 : 1489913912
Total Pages : 510 pages
Book Rating : 4.4/5 (899 download)
Download or read book Quantum Communications and Measurement written by V.P. Belavkin and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Workshop on Quantum Communications and Measurement was held at the University of Nottingham from July 10-16, 1994. It followed the successful meeting on Quantum Aspects of Optical Communications in Paris in November 1990. This time the conference was devoted to mathematical, physical and engineering aspects of quantum noise, signal processing and quantum informa tion in open systems, quantum channels, and optical communications. It brought research workers in the experimental and engineering aspects of quantum optics and communication systems into contact with theoreticians working in quantum probability and measurement theory. The workshop was attended by more than 130 participants from 22 different countries. The largest groups [after the UK (31)] were from Japan (19) and from Russia (14). The subjects discussed included the mathematical foundations of quantum communication systems, experiments and devices, the problem of collapse and continuous measurement, quantum input and output processes, causality and nondemolition observation, squeezed states, quan tum jumps, state diffusion and spontaneous localization, filtering and control in quantum systems, and new quantum optical phenomena and effects, including non classical light. These new mathematical and physical ideas were stimulated by recent advances in generation and detection of light with low quantum noise and the development of techniques for trapping a single atom over an extended period of time, making it possible to observe individual quantum phenomena at the macroscopic level.
Author : Paolo Tombesi
Publisher : Springer Science & Business Media
ISBN 13 : 0306466090
Total Pages : 472 pages
Book Rating : 4.3/5 (64 download)
Download or read book Quantum Communication, Computing, and Measurement 3 written by Paolo Tombesi and published by Springer Science & Business Media. This book was released on 2001-06-30 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is the proceedings of the 5th International Conference on Quantum Communication, Computing , and Measurement, held in Capri in July 2000, and covers all areas of quantum information science, which has developed dramatically recently. An excellent overview of the current topics in the field, it discusses quantum information theory, quantum measurement theory, decoherence, and entanglement theory as the theoretical aspect of quantum information science. Also included are quantum communication systems, quantum computing, quantum cryptography, new quantum effects and their experiments, generation and detection of nonclassical light, and teleportation as applications of quantum information science. In addition, the result of the third international quantum communication award is introduced.
Author : Alexander V. Sergienko
Publisher : CRC Press
ISBN 13 : 1420026607
Total Pages : 248 pages
Book Rating : 4.4/5 (2 download)
Download or read book Quantum Communications and Cryptography written by Alexander V. Sergienko and published by CRC Press. This book was released on 2018-10-03 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: All current methods of secure communication such as public-key cryptography can eventually be broken by faster computing. At the interface of physics and computer science lies a powerful solution for secure communications: quantum cryptography. Because eavesdropping changes the physical nature of the information, users in a quantum exchange can easily detect eavesdroppers. This allows for totally secure random key distribution, a central requirement for use of the one-time pad. Since the one-time pad is theoretically proven to be undecipherable, quantum cryptography is the key to perfect secrecy. Quantum Communications and Cryptography is the first comprehensive review of the past, present, and potential developments in this dynamic field. Leading expert contributors from around the world discuss the scientific foundations, experimental and theoretical developments, and cutting-edge technical and engineering advances in quantum communications and cryptography. The book describes the engineering principles and practical implementations in a real-world metropolitan network as well as physical principles and experimental results of such technologies as entanglement swapping and quantum teleportation. It also offers the first detailed treatment of quantum information processing with continuous variables. Technologies include both free-space and fiber-based communications systems along with the necessary protocols and information processing approaches. Bridging the gap between physics and engineering, Quantum Communications and Cryptography supplies a springboard for further developments and breakthroughs in this rapidly growing area.
Author : Stephen M. Barnett
Publisher : A I P Press
ISBN 13 :
Total Pages : 452 pages
Book Rating : 4.F/5 ( download)
Download or read book Quantum Communication, Measurement and Computing written by Stephen M. Barnett and published by A I P Press. This book was released on 2004-11-19 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers were peer reviewed.Quantum communications, measurement and computing embodies the fledgling science of quantum information. It applies quantum physics to tackle the challenges of next generation information processing. The conference was the seventh in the series. These proceedings describe papers presented at the meeting and represent the forefront of current research. Topics include: quantum communication, measurement, quantum computation, entanglement, quantum cryptography, sources of quantum states, time, as well as dissipation and decoherence.
Author : V.W.S. Chan
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (84 download)
Download or read book Characterization of Maesurements in Quantum Communication written by V.W.S. Chan and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Hye Won Chung
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.:/5 (893 download)
Download or read book Extracting Classical Information from Quantum States written by Hye Won Chung and published by . This book was released on 2014 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Motivated by the increasing demand for more powerful and efficient optical communication systems, quantum mechanics of information processing has become the key element in determining the fundamental limits of physical channels, and in designing quantum communication systems that approach those fundamental limits. To achieve higher data rates over quantum optical channels, we need to efficiently extract classical information from quantum states. However, peculiar properties of quantum states, such as the no-cloning theorem and the non-reversible measurement process, provide new challenges in the measurement of quantum states; in quantum information science, there is no concept analogous to sufficient statistics in classical information science. Therefore, to extract as much information as possible from quantum states, it is important to choose the right measurement process. In this thesis, we investigate the fundamental question of how to design the measurement process to efficiently extract information from quantum states. First, we consider adaptive measurement, with which we measure each received quantum state one at a time, and then update the next measurement process based on the previous observations. We show that for binary hypothesis testing between two ideal laser light pulses, if we update the adaptive measurement to maximize the communication efficiency at each instant, based on recursively updated knowledge of the receiver, then we can achieve the theoretical lower bound of the detection error probability. Using this viewpoint, we give a natural generalization of the adaptive measurement to general Mary hypothesis testing problems. We also analyze the information capacity with adaptive measurement, and compare the result with that for direct detection receivers and the ultimate capacity of quantum channels (the Holevo limit). We also investigate finite-blocklength joint receivers. The ultimate capacity of quantum channels is calculated under the assumption that an infinite number of quantum states can be collectively measured in one shot. However, this assumption becomes the primary barrier that prevents practical implementations of capacity-achieving joint detection receivers. The maximum number of classical information bits extracted per use of the quantum channel strictly increases with the number of channel outputs jointly measured at the receiver. This phenomenon is called strict superadditivity, and it has been thought of as a unique property that can be observed only in quantum channels, but not in classical discrete memoryless channels (DMCs). In this thesis, we introduce a new aspect of understanding strict superadditivity by comparing the performance of concatenated coding over quantum channels and classical DMCs, for a fixed inner code length. We show that the strict superadditivity in information rate occurs due to a loss of information from hard-decisions at the finite blocklength. We also find a lower bound on the maximum achievable information rate as a function of the length of the quantum measurement. The analysis and new insights into the measurement process of quantum states that we develop in this thesis can be used to improve not only current quantum optical communication systems, but also classical information processing, where the data is too big to be handled with sufficient statistics. Our work would help develop new concepts of efficient statistics that provide systematic ways to choose useful information among big data while discarding the rest.
Author :
Publisher :
ISBN 13 :
Total Pages : 456 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author : Gianfranco Cariolaro
Publisher :
ISBN 13 : 9783319156019
Total Pages : pages
Book Rating : 4.1/5 (56 download)
Download or read book Quantum Communications written by Gianfranco Cariolaro and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This book demonstrates that a quantum communication system using the coherent light of a laser can achieve performance orders of magnitude superior to classical optical communications Quantum Communications provides the Masters and PhD signals or communications student with a complete basics-to-applications course in using the principles of quantum mechanics to provide cutting-edge telecommunications. Assuming only knowledge of elementary probability, complex analysis and optics, the book guides its reader through the fundamentals of vector and Hilbert spaces and the necessary quantum-mechanical ideas, simply formulated in four postulates. A turn to practical matters begins with and is then developed by: · development of the concept of quantum decision, emphasizing the optimization of measurements to extract useful information from a quantum system; · general formulation of a transmitter-receiver system · particular treatment of the most popular quantum communications systems--OOK, PPM, PSK and QAM; · more realistic performance evaluation introducing thermal noise and system description with density operators; · consideration of scarce existing implementations of quantum communications systems and their difficulties with suggestions for future improvement; and · separate treatment of quantum information with discrete and continuous states. Quantum Communications develops the engineering student's exposure to quantum mechanics and shows physics students that its theories can have practically beneficial application in communications systems. The use of example and exercise questions (together with a downloadable solutions manual for instructors) will help to make the material presented really sink in for students and invigorate subsequent research.
Author : John Edward Kaufmann
Publisher :
ISBN 13 :
Total Pages : 384 pages
Book Rating : 4.E/5 ( download)
Download or read book Communication Over a Quantum Channel with Feedback written by John Edward Kaufmann and published by . This book was released on 1980 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
