Quantum Network Coding

Author : Hjalmar Rall
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (141 download)

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Download or read book Quantum Network Coding written by Hjalmar Rall and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Communication takes place at every level in the processing of information, from the transporting of individual bits between logic gates in a classical computer to large transfers of data between computers over the internet. The study of communication is therefore essential to understanding information processing and particularly so in the case of quantum information processing. Quantum communication enables interactions between distant quantum systems and as such plays a key role in important applications of quantum information, such as distributed quantum computing, quantum key distribution, and information transport within quantum processors. Recent years have seen the introduction of noisy intermediate-scale quantum(NISQ) processors with upward of 100 qubits capable of performing simple quantum algorithms,as well as quantum communication networks achieving high fidelity. Despite the improvements in the hardware, noise and limited resources remain a hurdle to effective quantum communication. This is of particular practical importance in the scenario where multiple parties must simultaneously communicate quantum information across a shared quantum network,such as a future quantum internet. In this thesis, I study quantum network coding (QNC) and specifically the derivative measurement-based quantum network coding (MQNC), an alternative to standard quantum information routing, which promises reduced noise and resource requirements.By redistributing entanglement in resources called graph states, I was able to implement MQNC on current generation IBM Q superconducting quantum processors based in York town Heights in New York State and subsequently performed the protocol with improved fidelity compared to that which could be achieved using an earlier iteration of the hardware.Starting from these improved experimental results, noise in MQNC was studied in the context of a NISQ processor. While still noisy, the final states generated using MQNC possessed some entanglement useful for communication, and the conditions under which teleportation is possible across these states were investigated. The possibility of entanglement purification for further reduction of noise was also investigated, but was not found to be practical on the current IBM hardware. Additionally, I introduce an alternative interpretation of QNC in the context of network switching and develop an efficient n ©7 n non-blocking switch based on MQNC and a classical switch network. This switch has a number of favourable properties in the context of NISQ hardware and may be implemented directly on a common processor topology. Lastly, protection against qubit loss errors tailored to MQNC was studied in the form of substantial modifications to a previously introduced counterfactual loss tolerance scheme." --Abstract.