Limitations of two-level emitters as nonlinearities in two-photon controlled-phase gates

Anders Nysteen; Dara P S McCutcheon; Mikkel Heuck; Jesper Mørk; Dirk R Englund

doi:10.1103/PhysRevA.95.062304

Limitations of two-level emitters as nonlinearities in two-photon controlled-phase gates

Anders Nysteen, Dara P S McCutcheon, Mikkel Heuck, Jesper Mørk, Dirk R Englund

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Abstract

We investigate the origin of imperfections in the fidelity of a two-photon controlled-phase gate based on two-level-emitter non-linearities. We focus on a passive system that operates without external modulations to enhance its performance. We demonstrate that the fidelity of the gate is limited by opposing requirements on the input pulse width for one- and two-photon scattering events. For one-photon scattering, the spectral pulse width must be narrow compared to the emitter linewidth, while two-photon scattering processes require the pulse width and emitter linewidth to be comparable. We find that these opposing requirements limit the maximum fidelity of the two-photon controlled-phase gate for Gaussian photon pulses to 84%.

Original language	English
Article number	062304
Number of pages	7
Journal	Physical Review A
Volume	95
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevA.95.062304
Publication status	Published - 5 Jun 2017

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title = "Limitations of two-level emitters as nonlinearities in two-photon controlled-phase gates",

abstract = "We investigate the origin of imperfections in the fidelity of a two-photon controlled-phase gate based on two-level-emitter non-linearities. We focus on a passive system that operates without external modulations to enhance its performance. We demonstrate that the fidelity of the gate is limited by opposing requirements on the input pulse width for one- and two-photon scattering events. For one-photon scattering, the spectral pulse width must be narrow compared to the emitter linewidth, while two-photon scattering processes require the pulse width and emitter linewidth to be comparable. We find that these opposing requirements limit the maximum fidelity of the two-photon controlled-phase gate for Gaussian photon pulses to 84\%. ",

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year = "2017",

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T1 - Limitations of two-level emitters as nonlinearities in two-photon controlled-phase gates

AU - Nysteen, Anders

AU - McCutcheon, Dara P S

AU - Heuck, Mikkel

AU - Mørk, Jesper

AU - Englund, Dirk R

PY - 2017/6/5

Y1 - 2017/6/5

N2 - We investigate the origin of imperfections in the fidelity of a two-photon controlled-phase gate based on two-level-emitter non-linearities. We focus on a passive system that operates without external modulations to enhance its performance. We demonstrate that the fidelity of the gate is limited by opposing requirements on the input pulse width for one- and two-photon scattering events. For one-photon scattering, the spectral pulse width must be narrow compared to the emitter linewidth, while two-photon scattering processes require the pulse width and emitter linewidth to be comparable. We find that these opposing requirements limit the maximum fidelity of the two-photon controlled-phase gate for Gaussian photon pulses to 84%.

AB - We investigate the origin of imperfections in the fidelity of a two-photon controlled-phase gate based on two-level-emitter non-linearities. We focus on a passive system that operates without external modulations to enhance its performance. We demonstrate that the fidelity of the gate is limited by opposing requirements on the input pulse width for one- and two-photon scattering events. For one-photon scattering, the spectral pulse width must be narrow compared to the emitter linewidth, while two-photon scattering processes require the pulse width and emitter linewidth to be comparable. We find that these opposing requirements limit the maximum fidelity of the two-photon controlled-phase gate for Gaussian photon pulses to 84%.

UR - https://arxiv.org/abs/1612.04803

U2 - 10.1103/PhysRevA.95.062304

DO - 10.1103/PhysRevA.95.062304

M3 - Article (Academic Journal)

SN - 2469-9926

VL - 95

JO - Physical Review A

JF - Physical Review A

IS - 6

M1 - 062304

ER -

Limitations of two-level emitters as nonlinearities in two-photon controlled-phase gates

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