Autonomous Quantum State Transfer by Dissipation Engineering

TL;DR

This paper demonstrates how dissipation engineering in open quantum systems enables autonomous, directional quantum state transfer between stationary qubits without the need for precise timing control.

Contribution

It introduces a dissipation-based method for autonomous quantum state transfer, eliminating the need for time-dependent control in quantum information processing.

Findings

Minimum system dimension for transfer is 3x2 plus an auxiliary reservoir.

Proposes realistic superconducting circuit implementations.

Suggests schemes for long-distance state transfer using impedance-matched dissipation.

Abstract

Quantum state transfer from an information-carrying qubit to a receiving qubit is ubiquitous for quantum information technology. In a closed quantum system, this task requires precisely-timed control of coherent qubit-qubit interactions that are intrinsically reciprocal. Here, breaking reciprocity by tailoring dissipation in an open system, we show that it is possible to autonomously transfer a quantum state between stationary qubits without time-dependent control. We present the general requirements for this directional transfer process, and show that the minimum system dimension for transferring one qubit of information is 3 $\times$ 2 (between one physical qutrit and one physical qubit), plus one auxiliary reservoir. We propose realistic implementations in present-day superconducting circuit QED experiments, and further propose schemes compatible with long-distance state transfer using impedance-matched dissipation engineering.