Trade-off between information gain and fidelity under weak measurements

Longfei Fan, Wenchao Ge, Hyunchul Nha, M. Suhail Zubairy

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4 Citations (Scopus)

Abstract

It is of general interest how a quantum measurement may disturb a quantum system while it gives information on the state of the system. We study a trade-off relation between the information gain and the output fidelity for a quantum nondemolition measurement scheme for photon numbers. Toward this aim, we obtain general expressions for the information gain and the output fidelity for an arbitrary initial state. We particularly investigate how these two quantities vary with measurement strength for some specific classes of states, through a single measurement or successive measurements.

Original languageEnglish
Article number022114
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume92
Issue number2
DOIs
Publication statusPublished - 17 Aug 2015

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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