The effect of quantum memory on quantum speed limit time for CP-(in)divisible channels

TL;DR

This paper explores how quantum memory influences the quantum speed limit time, showing that quantum memory can accelerate quantum evolution across various channels, beyond what CP-indivisibility alone predicts.

Contribution

It introduces a novel analysis of quantum speed limit time as a function of quantum memory, revealing that memory can enhance evolution speed in both CP-divisible and indivisible channels.

Findings

Quantum memory can speed up quantum evolution.

Quantum memory effects extend beyond CP-indivisibility criteria.

Memory influences the speed limit in non-unitary quantum dynamics.

Abstract

Quantum speed limit time defines the limit on the minimum time required for a quantum system to evolve between two states. Investigation of bounds on speed limit time of quantum system under non-unitary evolution is of fundamental interest, as it reveals interesting connections to quantum (non-)Markovianity. Here, we discuss the characteristics of quantum speed limit time as a function of quantum memory, quantified as the deviation from temporal self-similarity of quantum dynamical maps for CP-divisible as well as indivisible maps, and show that the presence of quantum memory can speed up quantum evolution. This demonstrates the enhancement of the speed of quantum evolution in the presence of quantum memory for a wider class of channels than indicated by the CP-indivisibility criterion.