Abstract A circuit quantum electrodynamics (QED) scheme is proposed for generating an on‐demand single‐photon source with full external engineering in a Floquet‐modulated Jaynes–Cummings (JC) system. The photon blockade effect can be induced across multiple Floquet sidebands, enabling the selective generation of a bright single‐photon beam at a specific sideband frequency by adjusting the external driving field of the qubit, without requiring modifications to the circuit components. This is of significance for practical applications of integrated micro‐nano single quantum devices within a quantum information network.
Abstract A circuit quantum electrodynamics (QED) scheme is proposed for generating an on‐demand single‐photon source with full external engineering in a Floquet‐modulated Jaynes–Cummings (JC) system. The photon blockade effect can be induced across multiple Floquet sidebands, enabling the selective generation of a bright single‐photon beam at a specific sideband frequency by adjusting the external driving field of the qubit, without requiring modifications to the circuit components. This is of significance for practical applications of integrated micro‐nano single quantum devices within a quantum information network.
ABSTRACT High‐performance unidirectional and directional single‐photon sources characterized by high purity and brightness are crucial in quantum networks. In this work, photon blockade has been demonstrated with maximized mean photon number in the emitter, cavity and two‐field driving Jaynes–Cummings models using two‐photon dissipation. The results show that the two‐photon dissipation process effectively enhance the antibunching effect, thereby reducing the necessity for sufficiently strong coupling strengths and enabling the realization of photon blockade at points of maximized mean photon number. Based on prior study, nonreciprocal photon blockade via chiral coupling is proposed in conjunction with two‐photon dissipation under different driving configurations. The results indicate that nonreciprocal photon blockade emerges in both cavity and two‐field driving cases, but is absent in the emitter driving case. Under cavity driving, the nonreciprocal photon blockade accompanies with relatively higher mean photon number. Under two‐field driving, additional advantages are observed. First, the nonreciprocal photon blockade can be obtained independently in both driving directions. Second, the effect is stronger compared to that under cavity driving. Third, it operates effectively over relatively broader continuous frequency ranges. This work is meaningful for the development of high‐performance single‐photon sources and nonreciprocal single‐photon devices in simple cavity quantum electrodynamics systems.
Abstract The capability to design spectrally controlled photon emission is not only fundamentally interesting for understanding frequency‐encoded light–matter interactions, but also is essential for realizing the preparation and manipulation of quantum states. Here, a dynamically modulated qubit array is considered, and realize frequency‐controlled single‐photon emission focusing on the generation of a frequency comb constituted solely of even‐parity or anti‐Stokes sidebands. This system also offers parity‐dependent bunching and antibunching in frequency‐filtered quantum correlations. In particular, the waveguide quantum electrodynamics (QED) setup is extended to include chiral and non‐local coupling architectures, thereby enhancing its versatility in Floquet engineering. This proposal also supports the predictable generation of high‐dimensional entangled quantum states, where the corresponding effective Hilbert space dimension is well controlled by energy modulation. Moreover, the utilisation of sophisticated numerical tools, such as the matrix product states (MPSs) and the discretization approach, enables the efficient simulation of multi‐photon dynamics, in which the non‐Markovian Floquet steady states emerge. This work fundamentally broadens the fields of collective emission, and has wide applications in implementing frequency‐encoded quantum information processing and many‐body quantum simulation.
We propose a scheme to realize a two-photon Jaynes-Cummings model for a single atom inside an optical cavity. It is shown that the interplay of a laser detuning and atom (cavity) pump (driven) field gives rise to the strong single photon blockade, two-photon bundles, and photon-induced tunneling. With the cavity driven field, strong photon blockade occurs in the weak coupling regime, and switching between single photon blockade and photon-induced tunneling at two-photon resonance are achievable via increasing the driven strength. By turning on the atom pump field, quantum switching between two-photon bundles and photon-induced tunneling at four-photon resonance are realized. More interestingly, the high-quality quantum switching between single photon blockade, two-photon bundles, and photon-induced tunneling at three-photon resonance is achieved with combining the atom pump and cavity driven fields simultaneously. In contrast to the standard two-level Jaynes-Cummings model, our scheme with generating a two-photon (multi-photon) Jaynes-Cummings model reveals a prominent strategy to engineer a series of special nonclassical quantum states, which may pave the way for investigating basic quantum devices to implement in quantum information processing and quantum networks.
Abstract In this paper, the photon blockade effect in a three-wave mixing coupling system with a quantum dot has been studied. By using analytical calculation and numerical analysis, we find that both the conventional photon blockade and the unconventional photon blockade effects could be realized in this system in strong-coupling regime just by one driving. Besides, compared with Jaynes–Cummings model, this hybrid system shows other obvious advantages in realizing the photon blockade, like blockading photon of more different frequencies, stronger antibunching effect. All the results may provide useful theoretical references for the single-photon devices design by using quantum dot and three-wave mixing system in future experiments and applications.
Single-photon devices at microwave frequencies are important for applications in quantum information processing and communication in the microwave regime. In this work we describe a proposal of a multioutput single-photon device. We consider two superconducting resonators coupled to a gap-tunable qubit via both its longitudinal and transverse degrees of freedom. Thus, this qubit-resonator coupling differs from the coupling in standard circuit quantum-electrodynamic systems described by the Jaynes-Cummings model. We demonstrate that an effective quadratic coupling between one of the normal modes and the qubit can be induced and this induced second-order nonlinearity is much larger than that for conventional Kerr-type systems exhibiting photon blockade. Assuming that a coupled normal mode is resonantly driven, we observe that the output fields from the resonators exhibit strong sub-Poissonian photon-number statistics and photon antibunching. Contrary to previous studies on resonant photon blockade, the first-excited state of our device is a pure single-photon Fock state rather than a polariton state, i.e., a highly hybridized qubit-photon state. In addition, it is found that the optical state truncation caused by the strong qubit-induced nonlinearity can lead to an entanglement between the two resonators, even in their steady state under the Markov approximation.
We investigate the photon blockade effect in a Jaynes-Cummings hybrid system with Kerr nonlinearity. Specifically, the hybrid system consists of a Jaynes-Cummings model nonlinearly coupled to two other optical modes. Our results, supported by both analytical calculations and numerical simulations, show that strong photon antibunching can occur in this system. Compared with a system without Kerr nonlinearity, the proposed system exhibits a stronger photon blockade effect due to the superposition of unconventional (quantum interference) and conventional (Kerr-induced anharmonicity) blockade mechanisms. Furthermore, we discuss the influences of Jaynes-Cummings coupling and driving strength on the photon blockade. Our findings may contribute to the design and application of single-photon source devices.