Quantum speed limit time of a qubit system with non-Hermitian detuning

TL;DR

This paper explores how non-Hermitian detuning affects the quantum speed limit time of a qubit, revealing that it can be made arbitrarily small or zero, thus enabling effective acceleration of quantum evolution.

Contribution

It demonstrates that non-Hermitian detuning allows for the quantum speed limit time to be minimized or nullified, which was not previously understood.

Findings

Quantum speed limit time can be arbitrarily small or zero.

Non-Hermitian detuning accelerates quantum evolution.

No nonzero lower bound exists for evolution time in this system.

Abstract

We investigated the quantum speed limit time of a qubit system with non-Hermitian detuning. Our results show that, with respect to two distinguishable states of the non-Hermitian system, the evolutionary time does not have a nonzero lower bound. And the quantum evolution of the system can be effectively accelerated by adjusting the non-Hermitian detuning parameter, as well as the quantum speed limit time can be arbitrarily small even be zero.