A single-photon microwave switch with recoverable control photon

TL;DR

This paper proposes a superconducting circuit-based single-photon microwave switch that uses one control photon to modulate another photon, with the ability to recover the control photon after switching, advancing ultra-low-power quantum-classical hybrid devices.

Contribution

It introduces a novel single-photon microwave switch with recoverable control photon using circuit QED, enabling low-power classical processing within quantum systems.

Findings

Switch performance quantified by photon flux

Control photon can be recovered post-switching

Design compatible with current superconducting technology

Abstract

Scalable quantum technologies may be applied in prospective architectures employing traditional information processing elements, such as transistors, rectifiers, or switches modulated by low-power inputs. In this respect, recently developed quantum processors based, e.g., on superconducting circuits may alternatively be employed as the basic platform for ultra-low-power consumption classical processors, in addition to obvious applications in quantum information processing and quantum computing. Here we propose a single-photon microwave switch based on a circuit quantum electrodynamics setup, in which a single control photon in a transmission line is able to switch on/off the propagation of another single photon in a separate line. The performances of this single-photon switch are quantified in terms of the photon flux through the output channel, providing a direct comparison of our results with available data. Furthermore, we show how the design of this microwave switch enables the recovery of the single control photon after the switching process. This proposal may be readily realized in state-of-art superconducting circuit technology.