Quantum state transfer between superconducting cavities via exchange-free interactions

TL;DR

This paper introduces a novel, exchange-free quantum state transfer protocol between superconducting cavities using continuous two-mode squeezing, demonstrating coherent, bidirectional transfer of arbitrary quantum states including error correction codes.

Contribution

The paper presents the first experimental realization of exchange-free quantum state transfer between superconducting cavities using continuous two-mode squeezing interactions.

Findings

Successful bidirectional transfer of arbitrary quantum states

Implementation of quantum error correction codes transfer

Provides a new approach to quantum transducers

Abstract

We propose and experimentally demonstrate a novel protocol for transferring quantum states between superconducting cavities using only continuous two-mode squeezing interactions, without exchange of photonic excitations between cavities. This approach conceptually resembles quantum teleportation, where quantum information is transferred between different nodes without directly transmitting carrier photons. In contrast to the discrete operations of entanglement and Bell-state measurement in teleportation, our scheme is symmetric and continuous. We experimentally realize coherent and bidirectional transfer of arbitrary quantum states, including bosonic quantum error correction codes. Our results offer new insights into the quantum state transfer and quantum teleportation. In particular, our demonstration validates a new approach to realize quantum transducers, and might find applications in a wide range of physical platforms.