Nonreciprocal light propagation in coupled microcavities system beyond weak-excitation approximation

Abstract

We propose a scheme for nonreciprocal light propagation in two coupled cavities system, in which a two-level quantum emitter is coupled to one of the optical microcavities. For the case of parity-time () symmetric system (i.e., coupled active-passive cavities system), the cavity gain can significantly enhance the optical nonlinearity induced by the interaction between a quantum emitter and cavity field beyond weak-excitation approximation. The increased optical nonlinearity results in the non-lossy nonreciprocal light propagation with high isolation ratio in proper parameters range. In addition, our calculations show that nonreciprocal light propagation will not be affected by the unstable output field intensity caused by optical bistability, and we can even switch directions of nonreciprocal light propagation by appropriately adjusting the system parameters.

Phase-controlled single-photon nonreciprocal transmission in a one-dimensional waveguide

“…Optical nonreciprocal devices allow the propagation of photons from one side to be superior than that from the opposite side. Due to its potential applications in quantum sensing and information process, the nonreciprocal signal transmission has been studied widely in various of physical systems, such as the opto-mechanical systems [1][2][3][4][5][6][7][8][9][10], parity-time-symmetry optical systems [11][12][13][14][15][16], cavity QED systems [17][18][19][20][21][22][23][24][25][26][27][28] and atomic systems [29][30][31][32][33][34]. On the other hand, the controllable photon transmission in quantum network composed by the waveguide and quantum node plays a central role in the design of quantum transistors [35][36][37][38][39][40], quantum routers [41,42], and frequency converters [43][44][45]…”

Nonreciprocity via Nonlinearity and Synthetic Magnetism

“…The combination of synthetic magnetism and nonlinearity is a general method to show both nonreciprocal transmission and nonreciprocal photon blockade simultaneously, and could be implemented in photonic systems, microwave superconducting circuits, and optomechanical systems [55,56]. Our work can also be extended to a wide range of systems with the Kerr nonlinearity replaced by second-order nonlinearity [57], optomechanical interaction [15][16][17], and the interaction to a two-level quantum emitter [18] or two-level atomic ensemble [19].…”

“…In recent years, many works have reported the construction of optical isolators in an asymmetric nonlinear optical molecule, which consists of two coupled cavities with one of them containing nonlinear interactions, such as Kerr nonlinear interaction [13,14], optomechanical interaction [15][16][17], and the interaction to a two-level quantum emitter [18] or two-level atomic ensemble [19]. To demonstrate nonreciprocity in these isolators, the amplitude of the input field is usually pretty large, and such isolators are constrained by a dynamic reciprocity relation for the input fields with small amplitude [20].…”

Ultrastrong tunable coupler between superconducting LC resonators

“…We also confirm that the coupler can be turned on and off by comparing the simulation and measurement results, including the crosstalk between the input and output ports. Also, inter-resonator couplings are expected to be applied for quantum computation using a cat code and a holonomic gate [36,37], a parametric amplifier [38] a the beam-splitter [39].…”