Quantum state correction using a measurement-based feedforward mechanism
Donaldson, Ross J. and Mazzarella, Luca and Zanforlin, Ugo and Collins, Robert J. and Jeffers, John and Buller, Gerald S. (2019) Quantum state correction using a measurement-based feedforward mechanism. Physical Review A - Atomic, Molecular, and Optical Physics, 100 (2). 023840. ISSN 1094-1622
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Abstract
One of the weaknesses of quantum optical state postselection schemes is the low success probability. Typically there is a trade-off between amplifier properties such as success probability and output state fidelity. However, here we present a state comparison amplifier for optical coherent states, which features an active measurement and feedforward mechanism to correct for errors made during the initial amplification. The simple and relatively low latency mechanism allows us to correct for a binary phase alphabet. We demonstrate a significant simultaneous improvement in the amplifier characteristic parameters: output state fidelity, correct state fraction, and success probability. This demonstrates that nondeterministic quantum amplification can be enhanced significantly by measurement and feedforward.
Author(s): | Donaldson, Ross J., Mazzarella, Luca ![]() ![]() | Item type: | Article |
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ID code: | 69832 |
Keywords: | quantum optical state postselection schemes, optical-fiber communications, photonics, quantum key distribution, QKD, quantum bit error rate, QBER, state comparison amplifier, SCAMP, Optics. Light, Atomic and Molecular Physics, and Optics |
Subjects: | Science > Physics > Optics. Light |
Department: | Faculty of Science > Physics |
Depositing user: | Pure Administrator |
Date deposited: | 19 Sep 2019 08:41 |
Last modified: | 07 Dec 2019 05:03 |
URI: | https://strathprints.strath.ac.uk/id/eprint/69832 |
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