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Type: Journal article
Title: Memory-enhanced noiseless cross-phase modulation
Author: Hosseini, M.
Rebić, S.
Sparkes, B.
Twamley, J.
Buchler, B.
Lam, P.
Citation: Light: Science and Applications, 2012; 1(DECEMBER):e40-1-e40-5
Publisher: Nature Publishing Group
Issue Date: 2012
ISSN: 2047-7538
Statement of
Mahdi Hosseini, Stojan Rebic, Ben M Sparkes, Jason Twamley, Ben C Buchler and Ping K Lam
Abstract: Large nonlinearity at the single-photon level can pave the way for the implementation of universal quantum gates. However, realizing large and noiseless nonlinearity at such low light levels has been a great challenge for scientists in the past decade. Here, we propose a scheme that enables substantial nonlinear interaction between two light fields that are both stored in an atomic memory. Semiclassical and quantum simulations demonstrate the feasibility of achieving large cross-phase modulation (XPM) down to the single-photon level. The proposed scheme can be used to implement parity gates from which CNOT gates can be constructed. Furthermore, we present a proof of principle experimental demonstration of XPM between two optical pulses: one stored and one freely propagating through the memory medium.
Keywords: CNOT gate; cross-phase modulation; electromagnetically induced transparency; parity gate; quantum memory
Rights: © 2012 CIOMP. All rights reserved. This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivative Works 3.0 Unported License. To view a copy of this license, visit http://
DOI: 10.1038/lsa.2012.40
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Physics publications

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