Implementation of a Quantum Switch with Superconducting Circuits: Part 2

A quantum switch (QSwitch) is a four-node quantum router that swaps a single photon between an input and two outputs based on a quantum address. In contrast to previous quantum routers, which require the output qubit to be classically selected, a QSwitch can route to a superposition of outputs. A QSwitch is a necessary component for building a quantum RAM (QRAM), as the gate that it enables forms the basis of the memory access operation upon which QRAM usage relies.

This is the second part of a two-part talk. In this part, we present experimental results on a QSwitch implemented using four fixed-frequency transmons. We will discuss how we characterize the gates used in the protocol, benchmark the overall protocol performance, and consider possible sources of error.