Quantum noise induced nonreciprocity for single photon transport in parity-time symmetric systems

• URL: http://arxiv.org/abs/2407.00758v1
• Date: Sun, 30 Jun 2024 16:47:57 GMT
• Title: Quantum noise induced nonreciprocity for single photon transport in parity-time symmetric systems
• Authors: Dibyendu Roy, G. S. Agarwal,
• Abstract summary: We show nonreciprocal light propagation for single-photon inputs due to quantum noise in coupled optical systems with gain and loss. We consider two parity-time ($mathcalPT$) symmetric linear optical systems consisting of either two directly coupled resonators or two finite-length waveguides evanescently coupled in parallel.
• Score: 1.6597433198079004
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We show nonreciprocal light propagation for single-photon inputs due to quantum noise in coupled optical systems with gain and loss. We consider two parity-time ($\mathcal{PT}$) symmetric linear optical systems consisting of either two directly coupled resonators or two finite-length waveguides evanescently coupled in parallel. One resonator or waveguide is filled with an active gain medium and the other with a passive loss medium. The light propagation is reciprocal in such $\mathcal{PT}$ symmetric linear systems without quantum noise. We show here that light transmission becomes nonreciprocal when we include quantum noises in our modeling, which is essential for a proper physical description. The quantum nonreciprocity is especially pronounced in the $\mathcal{PT}$ broken phase. Transmitted light intensity in the waveguide of incidence is asymmetric for two waveguides even without noise. Quantum noise significantly enhances such asymmetry in the broken phase.

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