Photonic controlled- PHASE gates through Rydberg blockade in optical cavities

Sumanta Kumar Das; Andrey Grankin; Ivan Iakoupov; Etienne Brion; Johannes Borregaard; Rajiv Boddeda; Imam Usmani; Alexei Ourjoumtsev; Philippe Grangier; Anders Søndberg Sørensen

doi:10.1103/PhysRevA.93.040303

Photonic controlled- PHASE gates through Rydberg blockade in optical cavities

Sumanta Kumar Das, Andrey Grankin, Ivan Iakoupov, Etienne Brion, Johannes Borregaard, Rajiv Boddeda, Imam Usmani, Alexei Ourjoumtsev, Philippe Grangier, Anders Søndberg Sørensen

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Abstract

We propose a scheme for high-fidelity photonic controlled-phase gates using a Rydberg blockade in an ensemble of atoms in an optical cavity. The gate operation is obtained by first storing a photonic pulse in the ensemble and then scattering a second pulse from the cavity, resulting in a phase change depending on whether the first pulse contained a single photon. We show that the combination of a Rydberg blockade and optical cavities effectively enhances the optical nonlinearity created by the strong Rydberg interaction and makes the gate operation more robust. The resulting gate can be implemented with cavities of moderate finesse, allowing for highly efficient processing of quantum information encoded in photons. As an illustration, we show how the gate can be employed to increase the communication rate of quantum repeaters based on atomic ensembles.

Original language	English
Article number	040303
Journal	Physical Review A (Atomic, Molecular and Optical Physics)
Volume	93
Issue number	4
ISSN	2469-9926
DOIs	https://doi.org/10.1103/PhysRevA.93.040303
Publication status	Published - 11 Apr 2016

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title = "Photonic controlled- PHASE gates through Rydberg blockade in optical cavities",

abstract = "We propose a scheme for high-fidelity photonic controlled-phase gates using a Rydberg blockade in an ensemble of atoms in an optical cavity. The gate operation is obtained by first storing a photonic pulse in the ensemble and then scattering a second pulse from the cavity, resulting in a phase change depending on whether the first pulse contained a single photon. We show that the combination of a Rydberg blockade and optical cavities effectively enhances the optical nonlinearity created by the strong Rydberg interaction and makes the gate operation more robust. The resulting gate can be implemented with cavities of moderate finesse, allowing for highly efficient processing of quantum information encoded in photons. As an illustration, we show how the gate can be employed to increase the communication rate of quantum repeaters based on atomic ensembles.",

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T1 - Photonic controlled- PHASE gates through Rydberg blockade in optical cavities

AU - Das, Sumanta Kumar

AU - Grankin, Andrey

AU - Iakoupov, Ivan

AU - Brion, Etienne

AU - Borregaard, Johannes

AU - Boddeda, Rajiv

AU - Usmani, Imam

AU - Ourjoumtsev, Alexei

AU - Grangier, Philippe

AU - Sørensen, Anders Søndberg

PY - 2016/4/11

Y1 - 2016/4/11

N2 - We propose a scheme for high-fidelity photonic controlled-phase gates using a Rydberg blockade in an ensemble of atoms in an optical cavity. The gate operation is obtained by first storing a photonic pulse in the ensemble and then scattering a second pulse from the cavity, resulting in a phase change depending on whether the first pulse contained a single photon. We show that the combination of a Rydberg blockade and optical cavities effectively enhances the optical nonlinearity created by the strong Rydberg interaction and makes the gate operation more robust. The resulting gate can be implemented with cavities of moderate finesse, allowing for highly efficient processing of quantum information encoded in photons. As an illustration, we show how the gate can be employed to increase the communication rate of quantum repeaters based on atomic ensembles.

AB - We propose a scheme for high-fidelity photonic controlled-phase gates using a Rydberg blockade in an ensemble of atoms in an optical cavity. The gate operation is obtained by first storing a photonic pulse in the ensemble and then scattering a second pulse from the cavity, resulting in a phase change depending on whether the first pulse contained a single photon. We show that the combination of a Rydberg blockade and optical cavities effectively enhances the optical nonlinearity created by the strong Rydberg interaction and makes the gate operation more robust. The resulting gate can be implemented with cavities of moderate finesse, allowing for highly efficient processing of quantum information encoded in photons. As an illustration, we show how the gate can be employed to increase the communication rate of quantum repeaters based on atomic ensembles.

U2 - 10.1103/PhysRevA.93.040303

DO - 10.1103/PhysRevA.93.040303

M3 - Journal article

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VL - 93

JO - Physical Review A (Atomic, Molecular and Optical Physics)

JF - Physical Review A (Atomic, Molecular and Optical Physics)

IS - 4

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Photonic controlled- PHASE gates through Rydberg blockade in optical cavities

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