Memory-enhanced noiseless cross-phase modulation
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(Published version)
Date
2012
Authors
Hosseini, M.
Rebić, S.
Sparkes, B.
Twamley, J.
Buchler, B.
Lam, P.
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Journal article
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Light: Science & Applications, 2012; 1(DECEMBER):e40-1-e40-5
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Mahdi Hosseini, Stojan Rebic, Ben M Sparkes, Jason Twamley, Ben C Buchler and Ping K Lam
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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.
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© 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:// creativecommons.org/licenses/by-nc-nd/3.0