Quantum switch for single-photon transport in a coupled superconducting transmission line resonator array

TL;DR

This paper proposes a quantum switch mechanism for single-photon transport in a superconducting resonator array, enabling controllable photon routing via tunable interactions mediated by a SQUID.

Contribution

It introduces a novel method to realize a quantum switch for single-photon transport using a controllable hopping interaction in a superconducting resonator array.

Findings

Single-photon transport can be controlled with arbitrary wavevector.

Controllable hopping interaction is achieved via a detuned SQUID.

The approach enables tunable photon routing in superconducting circuits.

Abstract

We propose and study an approach to realize quantum switch for single-photon transport in a coupled superconducting transmission line resonator (TLR) array with one controllable hopping interaction. We find that the single-photon with arbitrary wavevector can transport in a controllable way in this system. We also study how to realize controllable hopping interaction between two TLRs via a superconducting quantum interference device (SQUID). When the frequency of the SQUID is largely detuned from those of the two TLRs, the variables of the SQUID can be adiabatically eliminated and thus a controllable interaction between two TLRs can be obtained.