Quantum Zeno switch for single-photon coherent transport
Lan Zhou, S. Yang, Yu-xi Liu, C. P. Sun, Franco Nori

TL;DR
This paper introduces a quantum Zeno switch that uses high-frequency modulation of a two-level system to control single-photon transport in a waveguide, enabling on/off switching of photon reflection.
Contribution
It presents a novel method to control TLS-environment coupling via dynamical quantum Zeno effect, with analytical and numerical validation for single-photon transport control.
Findings
Coupling can be turned on or off by adjusting modulation parameters.
Photon reflection vanishes at zeros of a Bessel function.
Analytical results agree with Floquet numerical simulations.
Abstract
Using a dynamical quantum Zeno effect, we propose a general approach to control the coupling between a two-level system (TLS) and its surroundings, by modulating the energy level spacing of the TLS with a high frequency signal. We show that the TLS--surroundings interaction can be turned on or off when the ratio between the amplitude and the frequency of the modulating field is adjusted to be a zero of a Bessel function. The quantum Zeno effect of the TLS can also be observed by the vanishing of the photon reflection at these zeros. Based on these results, we propose a quantum switch to control the transport of a single photon in a 1D waveguide. Our analytical results agree well with numerical results using Floquet theory.
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