Quantum State Transfer via a Multimode Resonator

TL;DR

This paper introduces a non-Markovian formalism for quantum state transfer via multimode resonators, combining low loss and high speed features, suitable for scalable superconducting quantum computing.

Contribution

It proposes a novel quantum state transfer scheme using multimode resonators with strong coupling, bridging single-mode cavity methods and waveguide protocols.

Findings

Scheme is immune to thermal channel occupations with harmonic resonators.

Achieves low loss and high speed quantum state transfer.

Applicable for scalable superconducting quantum computing.

Abstract

Large-scale fault-tolerant superconducting quantum computation needs rapid quantum communication to network qubits fabricated on different chips and long-range couplers to implement efficient quantum error-correction codes. Quantum channels used for these purposes are best modeled by multimode resonators, which lie between single-mode cavities and waveguides with a continuum of modes. In this Letter, we propose a non-Markovian formalism for quantum state transfer using coupling strengths comparable to the channel's free spectral range ($g{\sim}\fsr$). Our scheme merges features of both the STIRAP-based methods for single-mode cavities and the pitch-and-catch protocol for long waveguides, integrating their advantage of low loss and high speed. It is immune to thermal channel occupations if using harmonic resonators for the sender and receiver.