Estimating the postmeasurement state

Jürgen Audretsch, L. Diósi, Thomas Konrad

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Generalized measurement {Ms} on a single d-level quantum system was studied. For the case when the initial state is pure and otherwise completely unknown, it was pointed out that the best estimates of the premeasurement and postmeasurement states for a given measurement readout s are the respective right and left eigenvectors of Ms, belonging to the (common) largest eigenvalue. The mean post-measurement estimation fidelity of the measurement device was also calculated and shown to satisfy a simple relationship with the mean premeasurement estimation fidelity. A constraint between the postmeasurement estimation fidelity and the operation fidelity of the measurement illustrated how state disturbance and information gain about the postmeasurement state are competing with each other.

Original languageEnglish
JournalPhysical Review A
Volume68
Issue number3
Publication statusPublished - Sep 2003

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physics and Astronomy(all)

Cite this

Audretsch, J., Diósi, L., & Konrad, T. (2003). Estimating the postmeasurement state. Physical Review A, 68(3).

Estimating the postmeasurement state. / Audretsch, Jürgen; Diósi, L.; Konrad, Thomas.

In: Physical Review A, Vol. 68, No. 3, 09.2003.

Research output: Contribution to journalArticle

Audretsch, J, Diósi, L & Konrad, T 2003, 'Estimating the postmeasurement state', Physical Review A, vol. 68, no. 3.
Audretsch J, Diósi L, Konrad T. Estimating the postmeasurement state. Physical Review A. 2003 Sep;68(3).
Audretsch, Jürgen ; Diósi, L. ; Konrad, Thomas. / Estimating the postmeasurement state. In: Physical Review A. 2003 ; Vol. 68, No. 3.
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