Phase-dependent which-way information

Schilling U, von Zanthier J (2012)

Publication Status: Published

Publication Type: Journal article

Publication year: 2012

Journal

Physics Letters A Elsevier

Publisher: Elsevier

Book Volume: 376

Pages Range: 3479-3484

Journal Issue: 46

DOI: 10.1016/j.physleta.2012.10.019

Abstract

We introduce an observable for reading out a which-way detector in a Young-type interferometer whose eigenstates either contain full which-way information or none at all. We calculate the which-way knowledge kappa that can be retrieved from this observable and find that kappa depends on the phase difference delta that the interfering quantum object accumulates on its passage through the interferometer. It turns out that for certain phase shifts kappa(delta) equals one, independent of the visibility of the interference pattern. In addition, within a certain range of phase shifts kappa(delta) can be larger than the which-way information obtained from the observable recognized to provide optimal which-way information on average. (C) 2012 Elsevier BM. All rights reserved.

Authors with CRIS profile

Uwe Schilling Graduiertenzentrum der FAU Joachim von Zanthier Quantum Optics & Quantum Information (QOQI)

Related research project(s)

Fundamental questions in quantum optics Jan. 1, 2007 - Jan. 1, 2010

How to cite

APA:

Schilling, U., & von Zanthier, J. (2012). Phase-dependent which-way information. Physics Letters A, 376(46), 3479-3484. https://doi.org/10.1016/j.physleta.2012.10.019

MLA:

Schilling, Uwe, and Joachim von Zanthier. "Phase-dependent which-way information." Physics Letters A 376.46 (2012): 3479-3484.

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