Collective advantages in qubit reset: effect of coherent qubits

TL;DR

This paper investigates how collective quantum effects can reduce the thermodynamic cost and improve the efficiency of qubit reset processes, especially in the quasistatic and finite-time regimes, with implications for quantum device design.

Contribution

It demonstrates that collective qubit reset can lower thermodynamic costs and enhance performance compared to individual resets, introducing new protocols and theoretical insights.

Findings

Thermodynamic cost of collective reset is lower than parallel reset due to entanglement.

Error probability diminishes and heat production approaches Landauer bound in finite-time protocols.

Qubit reset performance improves with increasing number of qubits.

Abstract

The Landauer principle sets a lower bound on the thermodynamic cost of qubit reset, which is only attainable for the quasistatic process. In this Letter, we explore the collective advantage of qubit reset of coherent qubits in three aspects. First, for the quasistatic process, the thermodynamic cost of collective reset is remarkably lower than parallel reset because of the reduced Hilbert space dimension due to entanglement effects. Second, for the finite-time qubit reset, we prove that the error probability fades away and per-qubit heat production tends the Landauer bound for initially continuous protocols in the thermodynamic limit. Third, we show that qubit reset performance enhances with the increase in the number of qubits. Our results, illustrated by different protocols, provide a blueprint for future quantum device fabrication.