Lower bounds for the time-bandwidth product of a single-photon pulse

A deterministic photon-photon quantum logic gate is a long-standing goal. Building such a gate becomes possible if a light pulse containing only one photon imprints a phase shift of π onto another light field. We experimentally demonstrate the generation of such a π phase shift with a single-photon pulse. A first light pulse containing less than one photon on average is stored in an atomic gas. Rydberg blockade combined with electromagnetically induced transparency creates a phase shift for a second light pulse, which propagates through the medium. We measure the π phase shift of the second pulse when we postselect the data upon the detection of a retrieved photon from the first pulse. This demonstrates a crucial step toward a photon-photon gate and offers a variety of applications in the field of quantum information processing.

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Numerical analyses of emission of a single-photon pulse based on single-atom–cavity quantum electrodynamics

Progress of Theoretical and Experimental Physics ◽

10.1093/ptep/ptz052 ◽

2019 ◽

Vol 2019 (6) ◽

Author(s):

Hiroo Azuma

Keyword(s):

Quantum Electrodynamics ◽

Single Photon ◽

Cavity Quantum Electrodynamics ◽

Numerical Analyses ◽

Single Atom ◽

Photon Pulse

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Cavity QED of a leaky planar resonator coupled to an atom and an input single-photon pulse

Physical Review A ◽

10.1103/physreva.88.033853 ◽

2013 ◽

Vol 88 (3) ◽

Cited By ~ 1

Author(s):

Denis Gonţa ◽

Peter van Loock

Keyword(s):

Cavity Qed ◽

Single Photon ◽

Photon Pulse

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Remote quantum state preparation and transfer with the interactions of photons and quantum-dot spins

Modern Physics Letters B ◽

10.1142/s0217984914501279 ◽

2014 ◽

Vol 28 (16) ◽

pp. 1450127 ◽

Cited By ~ 1

Author(s):

Xiao-Jie Yuan ◽

Ping Dong ◽

Min Wang ◽

Ming Yang ◽

Zhuo-Liang Cao

Keyword(s):

Quantum Dot ◽

Quantum State ◽

Single Photon ◽

State Preparation ◽

Coupling System ◽

Quantum State Preparation ◽

Cavity Coupling ◽

Photon Pulse ◽

Cavity System ◽

Singly Charged

In this paper, we propose a scheme of remote quantum state preparation and transfer that use a double-sided cavity system, in which a singly charged quantum dot is embedded in a double-sided optical microcavity with partially reflective top and bottom mirrors. The implementation of the scheme mainly depends on the interaction between the input single-photon pulse and the spins of electrons in the coupling system. Discussions about the effect of the cavity loss, side leakage and exciton–cavity coupling strength for the fidelity of generated states show that the fidelity can remain high enough by controlling these parameters. Therefore, the current scheme is feasible in the experiment.

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