| Autor: |
Jiang-Shan Tang, Wei Nie, Lei Tang, Mingyuan Chen, Xin Su, Yanqing Lu, Franco Nori, Keyu Xia |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Physical review letters. 128(20) |
| ISSN: |
1079-7114 |
| Popis: |
We study a single-photon band structure in a one-dimensional coupled-resonator optical waveguide that chirally couples to an array of two-level quantum emitters (QEs). The chiral interaction between the resonator mode and the QE can break the time-reversal symmetry without the magneto-optical effect and an external or synthetic magnetic field. As a result, nonreciprocal single-photon edge states, band gaps, and flat bands appear. By using such a chiral QE coupled-resonator optical waveguide system, including a finite number of unit cells and working in the nonreciprocal band gap, we achieve frequency-multiplexed single-photon circulators with high fidelity and low insertion loss. The chiral QE-light interaction can also protect one-way propagation of single photons against backscattering. Our work opens a new door for studying unconventional photonic band structures without electronic counterparts in condensed matter and exploring its applications in the quantum regime. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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