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Journal of the Optical Society of America B

Single-photon transistor based on tunable coupling in a cavity quantum electrodynamics system

Shuang Xu, H. Z. Shen, X. X. Yi

Published Jul 7, 2016• 7 citations
Publisher

Abstract

We propose a single-photon transistor scheme based on cavity quantum electrodynamics that employs variable coupling between a resonator and a waveguide. We show that the effective absorption of a single photon of arbitrary shape can be realized through controlled variation of the coupling. Subsequently, with coupling turned off, the absorbed photon would remain inside the resonator, alter the effective frequency of the artificial atom, and enable the controlled resonant transmission of multiple source photons. Moreover, the gate photon can be easily retrieved. Our results provide a promising platform for coherent manipulation and individual microwave photon detection, which has potential applications in quantum information processing and quantum communication.

DOI
10.1364/josab.33.001600

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We propose a single-photon transistor scheme based on cavity quantum electrodynamics that employs variable coupling between a resonator and a waveguide. We show that the effective absorption of a single photon of arbitrary shape can be realized through controlled variation of the coupling. Subsequently, with coupling turned off, the absorbed photon would remain inside the resonator, alter the effective frequency of the artificial atom, and enable the controlled resonant transmission of multiple source photons. Moreover, the gate photon can be easily retrieved. Our results provide a promising platform for coherent manipulation and individual microwave photon detection, which has potential applications in quantum information processing and quantum communication.
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A photonic transistor that can switch or amplify an optical signal with a single gate photon requires strong non-linear interaction at the single-photon level. Circuit quantum electrodynamics provides great flexibility to generate such an interaction, and thus could serve as an effective platform to realize a high-performance single-photon transistor. Here we demonstrate such a photonic transistor in the microwave regime. Our device consists of two microwave cavities dispersively coupled to a superconducting qubit. A single gate photon imprints a phase shift on the qubit state through one cavity, and further shifts the resonance frequency of the other cavity. In this way, we realize a gain of the transistor up to 53.4 dB, with an extinction ratio better than 20 dB. Our device outperforms previous devices in the optical regime by several orders in terms of optical gain, which indicates a great potential for application in the field of microwave quantum photonics and quantum information processing.
Abstract Controllable single-photon scattering in a one-dimensional waveguide coupled to a Jaynes–Cummings structure containing a time-modulated two-level atom interacting with a single-mode cavity is investigated. The photon transmission and reflection amplitudes are calculated by using an effective Floquet Hamiltonian in real space. The results show that the coupling between the atom and the cavity mode can dynamically be tuned via periodically modulating the atomic transition frequency. As a consequence, the scattering behaviors of the waveguide photons can be actively manipulated, and a controllable single-photon switch with high on-off ratio could be realized. More interestingly, the switch works well within a wide frequency region, i.e., the transmission of both resonant and off-resonant waveguide photons can be effectively switched on or off with appropriate system parameters. Furthermore, the proposed dynamically tunable switching scheme is robust against atomic dissipation associated with the help of atom-cavity coupling mismatch. Such single-photon device can be used as an elementary unit for various quantum information processing.
We present a scheme for photonic transistors based on photons and phonons in a cavity electromechanical system, which is composed of a superconducting microwave cavity coupled to a nanomechanical resonator. Control of the propagation of photons is achieved through the interaction of microwave field (photons) and nanomechanical vibrations (phonons). By calculating the transmission spectrum of the signal field, we show that the signal field can be efficiently attenuated or amplified, depending on the power of a second 'gating' (pump) field. This scheme may be a promising candidate for single-photon transistors and pave the way for numerous applications in telecommunication and quantum information technologies.
Cavity quantum electrodynamics (cavity QED) with single atoms and single photons provides a promising route toward scalable quantum information processing (QIP) and computing. A strongly coupled atom-cavity system should act as a universal quantum interface, allowing the generation and storage of quantum information. This thesis describes the realisation of an atom-cavity system used for the production and manipulation of single photons. These photons are shown to exhibit strong sub-Poissonian statistics and indistinguishability, both prerequisites for their use in realistic quantum systems. Further, the ability to control the temporal shape and internal phase of the photons, as they are generated in the cavity, is demonstrated. This high degree of control presents a novel mechanism enabling the creation of arbitrary photonic quantum bits.
We provide a proposal to achieve single-photon router in the microwave domain based on a waveguide quantum electrodynamics structure, which consists of a double-resonator side coupled to a superconducting transmission line. A superconducting quantum interference device is used to realize tunable and switchable coupling between the resonators; thereby the transport of a single photon in the transmission line can be effectively controlled. Our calculations show that the device has high on-off ratio and is experimentally feasible in currently available superconducting quantum circuits.