Quantum Information Processing with Single Photons and Atomic Ensembles in Microwave Coplanar Waveguide Resonators

Optical isolation is important for protecting a laser from damage due to the detrimental back reflection of light. It typically relies on breaking Lorentz reciprocity and normally is achieved via the Faraday magneto-optical effect, requiring a strong external magnetic field. Single-photon isolation, the quantum counterpart of optical isolation, is the key functional component in quantum information processing, but its realization is challenging. In this chapter, we present all-optical schemes for isolating the backscattering from single photons. In the first scheme, we show the single-photon isolation can be realized by using a chiral quantum optical system, in which a quantum emitter asymmetrically couples to nanowaveguide modes or whispering-gallery modes with high optical chirality. Secondly, we propose a chiral optical Kerr nonlinearity to bypass the so-called dynamical reciprocity in nonlinear optics and then achieve room-temperature photon isolation with low insertion loss. The concepts we present may pave the way for quantum information processing in an unconventional way.

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A versatile source of single photons for quantum information processing

Nature Communications ◽

10.1038/ncomms2838 ◽

2013 ◽

Vol 4 (1) ◽

Cited By ~ 147

Author(s):

Michael Förtsch ◽

Josef U. Fürst ◽

Christoffer Wittmann ◽

Dmitry Strekalov ◽

Andrea Aiello ◽

...

Keyword(s):

Information Processing ◽

Quantum Information ◽

Quantum Information Processing ◽

Single Photons

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Dipole Blockade and Quantum Information Processing in Mesoscopic Atomic Ensembles

Physical Review Letters ◽

10.1103/physrevlett.87.037901 ◽

2001 ◽

Vol 87 (3) ◽

Cited By ~ 992

Author(s):

M. D. Lukin ◽

M. Fleischhauer ◽

R. Cote ◽

L. M. Duan ◽

D. Jaksch ◽

...

Keyword(s):

Information Processing ◽

Quantum Information ◽

Quantum Information Processing ◽

Atomic Ensembles ◽

Dipole Blockade

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DECOHERENCE-FREE QUANTUM MEMORY FOR PHOTONIC STATE USING ATOMIC ENSEMBLES

International Journal of Quantum Information ◽

10.1142/s021974990900547x ◽

2009 ◽

Vol 07 (04) ◽

pp. 811-820 ◽

Cited By ~ 2

Author(s):

FENG MEI ◽

YA-FEI YU ◽

ZHI-MING ZHANG

Keyword(s):

Information Processing ◽

Quantum Information ◽

Large Scale ◽

Quantum Information Processing ◽

Single Photon ◽

Quantum Memory ◽

Single Photon Detection ◽

Atomic Ensembles ◽

Optical Elements ◽

Photonic State

Large scale quantum information processing requires stable and long-lived quantum memories. Here, using atom-photon entanglement, we propose an experimentally feasible scheme to realize decoherence-free quantum memory with atomic ensembles, and show one of its applications, remote transfer of unknown quantum state, based on laser manipulation of atomic ensembles, photonic state operation through optical elements, and single-photon detection with moderate efficiency. The scheme, with inherent fault-tolerance to the practical noise and imperfections, allows one to retrieve the information in the memory for further quantum information processing within the reach of current technology.

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