Control limit on quantum state preparation under decoherence

Kohei Kobayashi, Naoki Yamamoto

Research output: Contribution to journalArticle

Abstract

Quantum information technologies require careful control for generating and preserving a desired target quantum state. The biggest practical obstacle is of course decoherence. Therefore, the reachability analysis, which in our scenario aims to estimate the distance between the controlled state under decoherence and the target state, is of great importance to evaluate the realistic performance of those technologies. This paper presents a lower bound of the fidelity-based distance for a general open Markovian quantum system driven by the decoherence process and several types of control including feedback. The lower bound is straightforward to calculate and can be used as a guide for choosing the target state, as demonstrated in some examples. Moreover, the lower bound is applied to derive a theoretical limit in some quantum metrology problems based on a large-size atomic ensemble under control and decoherence.

Original languageEnglish
Article number052347
JournalPhysical Review A
Volume99
Issue number5
DOIs
Publication statusPublished - 2019 May 28

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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