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33.80.+m Atomic-ensemble quantum memory for light

Broadband noise-free optical quantum memory with neutral nitrogen-vacancy centers in diamond

Tue, 2015-06-02 01:48 - Josh Nunn
Date: 
2015-05-08
Author(s): 

E. Poem,* C. Weinzetl, J. Klatzow, K. T. Kaczmarek, J. H. D. Munns, T. F. M. Champion, D. J. Saunders, J. Nunn, and I. A. Walmsley

Reference: 

IOPEXPORT_BIB.bib

IOPEXPORT_BIB.bib

PhysRevB.91.205108
Broadband noise-free optical quantum memory with neutral nitrogen-vacancy centers in diamond
E. Poem and C. Weinzetl and J. Klatzow and K. T. Kaczmarek and J. H. D. Munns and T. F. M. Champion and D. J. Saunders and J. Nunn and I. A. Walmsley
Phys. Rev. B 
91 
205108 
(2015)
http://link.aps.org/doi/10.1103/PhysRevB.91.205108
http://dx.doi.org/10.1103/PhysRevB.91.205108
URL: 

http://journals.aps.org/prb/abstract/10.1103/PhysRevB.91.205108

It is proposed that the ground-state manifold of the neutral nitrogen-vacancy center in diamond could be used as a quantum two-level system in a solid-state-based implementation of a broadband noise-free quantum optical memory.

Interfacing GHz-bandwidth heralded single photons with a warm vapour Raman memory

Tue, 2015-06-02 01:44 - Josh Nunn
Date: 
2015-04-02
Author(s): 

P S Michelberger1, T F M Champion1, M R Sprague1, K T Kaczmarek1, M Barbieri1, X M Jin1,2, D G England1,3, W S Kolthammer1, D J Saunders1, J Nunn1 and I A Walmsley

Reference: 

IOPEXPORT_BIB.bib

IOPEXPORT_BIB.bib

1367-2630-17-4-043006
Interfacing GHz-bandwidth heralded single photons with a warm vapour Raman memory
P. S. Michelberger and T. F. M. Champion and M. R. Sprague and K. T. Kaczmarek and M. Barbieri and X. M. Jin and D. G. England and W. S. Kolthammer and D. J. Saunders and J. Nunn and I. A. Walmsley
New Journal of Physics 
17 
043006 
(2015)
http://stacks.iop.org/1367-2630/17/i=4/a=043006
Broadband quantum memories, used as temporal multiplexers, are a key component in photonic quantum information processing, as they make repeat-until-success strategies scalable. We demonstrate a prototype system, operating on-demand, by interfacing a warm vapour, high time-bandwidth-product Raman memory with a travelling wave spontaneous parametric down-conversion source. We store single photons and observe a clear influence of the input photon statistics on the retrieved light, which we find currently to be limited by noise. We develop a theoretical model that identifies four-wave mixing as the sole important noise source and point towards practical solutions for noise-free operation.
URL: 

http://iopscience.iop.org/1367-2630/17/4/043006

Quantum memory for entangled continuous-variable states

Mon, 2010-12-27 21:37 - Q-Essence Coordinator
Date: 
2010-11-07
Reference: 

K. Jensen, W. Wasilewski, H. Krauter, T. Fernholz, B. M. Nielsen, M. Owari, M. B. Plenio, A. Serafini, M. M. Wolf & E. S. Polzik,
Nature Physics 7, 13–16 (2011)
http://www.nature.com/nphys/journal/vaop/ncurrent/abs/nphys1819.html

A quantum memory for light is a key element for the realization of future quantum information networks. Requirements for a good quantum memory are versatility (allowing a wide range of inputs) and preservation of quantum information in a way unattainable with any classical memory device. Here we demonstrate such a quantum memory for continuous-variable entangled states, which play a fundamental role in quantum information processing.

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