Related papers: Symmetry Protected Two-Photon Coherence Time

Symmetry Protected Two-Photon Coherence Time

URL: http://arxiv.org/abs/2406.13028v1
Date: Tue, 18 Jun 2024 19:44:22 GMT
Title: Symmetry Protected Two-Photon Coherence Time
Authors: Xuanying Lai, Christopher Li, Alan Zanders, Yefeng Mei, Shengwang Du,
Abstract summary: We report the observation of symmetry protected two-photon coherence time of biphotons generated from backward spontaneous four-wave mixing in $87$Rb atoms. This outcome highlights the pivotal role of symmetry in manipulating and controlling photonic quantum states.
Score: 0.3518504468878697
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We report the observation of symmetry protected two-photon coherence time of biphotons generated from backward spontaneous four-wave mixing in laser-cooled $^{87}$Rb atoms. When biphotons are nondegenerate, non-symmetric photonic absorption loss results in exponential decay of the temporal waveform of the two-photon joint probability amplitude, leading to shortened coherence time. In contrast, in the case of degenerate biphotons, when both paired photons propagate with the same group velocity and absorption coefficient, the two-photon coherence time, protected by space-time symmetry, remains unaffected by medium absorptive losses. Our experimental results validate these theoretical predictions. This outcome highlights the pivotal role of symmetry in manipulating and controlling photonic quantum states.

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