Dynamical control of quantum state transfer within hybrid open systems

TL;DR

This paper investigates optimizing quantum state transfer in hybrid open systems, revealing that avoiding bath-induced errors and leakage constraints influence transfer speed, with slower transfers sometimes being more effective.

Contribution

It introduces a detailed analysis of quantum state transfer optimization considering bath memory effects and leakage, highlighting counterintuitive speed limitations.

Findings

Avoiding bath-induced errors depends on bath-memory time.

Faster transfer is not always optimal for a given energy.

Leakage out of the operational subspace limits transfer performance.

Abstract

We analyze quantum state-transfer optimization within hybrid open systems, from a "noisy" (write-in) qubit to its "quiet" counterpart (storage qubit). Intriguing interplay is revealed between our ability to avoid bath-induced errors that profoundly depend on the bath-memory time and the limitations imposed by leakage out of the operational subspace. Counterintuitively, under no circumstances is the fastest transfer optimal (for a given transfer energy).