Quantum routing of few photons using a nonlinear cavity coupled to two chiral waveguides

Abstract

We investigate few-photons scattering properties in two one-dimensional waveguides chirally coupled to a nonlinear cavity. The quantum states of scattered few-photons are solved analytically via a real-space approach, and the solution indicates the few-photons reflection and transmission properties. When inputing two photons of equal energy to resonate with the cavity, the propagation characteristics of the two photons will be interesting, which is different from the previous anti-bunching effects with a quantum emitter. More importantly, when the total energy of the two incident photons equals the energy of a nonlinear cavity accommodating two photons, the bound state will become larger influence resulting in the disappearance of the antibunching effect. However, the bound state have no effect the probability of routing to another waveguide.

Single-photon scattering and quantum entanglement of two giant atoms with azimuthal angle differences in a waveguide system

“…[1][2][3] In the past decades, waveguide quantum electrodynamics (wQED) systems, [4] which can tailor effectively the coupling between one-dimensional waveguide modes and quantum emitters, have provided powerful platforms to investigate the photon scattering. Based on such ideal platforms, a wide variety of striking transport properties in one-dimensional waveguides have been demonstrated, including asymmetrical Fano-line shapes, [5][6][7][8] electromagnetically induced transparency without control light field, [9][10][11] waveguide-mediated quantum entanglement, [12][13][14][15] unconventional photon blockade, [16][17][18][19] high-efficiency quantum routing and frequency conversion, [20][21][22][23][24][25] generating photonic band structures and bound states, [26][27][28] etc.…”

Frequency-tunable single-photon router based on a microresonator containing a driven three-level emitter

“…Consequently, a wide variety of studies on quantum routing are implemented in various wQED systems, including atomic qubits, [3][4][5][6][7] superconducting qubits, [8][9][10][11][12] quantum dots, [13,14] optomechanical systems, [15,16] optical cavity systems, [17][18][19][20] and chiral waveguide systems. [21][22][23][24][25] Generally, for an optical transmission system the incident frequency should match the resonance frequency of the coupled emitter in the router, which enables the router work efficiently. Off-resonance photons do not function greatly since there are no couplings with the quantum emitter.…”

Dynamic modulated single-photon routing

“…In this regard, a variety of theoretical and experimental efforts have been devoted to the realization and development of single-photon router based on atomic systems, [7][8][9] whispering-gallery resonators, [10][11][12][13] optomechanical systems, [14][15][16][17] cavity (circuit) quantum electrodynamics (QED), [18][19][20][21][22] and waveguide-QED systems. [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] However, most of the previous single-photon router can only work well with a high routing efficiency at the resonant or selected frequency point under the condition that all the system dissipations are completely ignored. [38][39][40] The selected frequency points are usually non-adjustable due to the fact that all the system parameters are constants in previous routing schemes.…”