Journal
PHYSICS LETTERS A
Volume 403, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physleta.2021.127383
Keywords
Sequential measurements; Indefinite causal order; Kirkwood-Dirac distribution; Weak value; Conditional visibility
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This study examines two projective measurements performed sequentially on a quantum system with completely indefinite order. The interference of different orders allows for the determination of the Kirkwood-Dirac distribution of the quantum system being measured, enabling the extraction of a weak value of an observable without the need for weak measurement. In an interferometric setting, the Kirkwood-Dirac distribution can be constructed from conditional visibility and phase shift.
Two projective measurements sequentially performed on a quantum system is studied in the case that the order of the measurements is completely indefinite. The interference of the different orders provides the Kirkwood-Dirac distribution of a quantum system to be measured and thus the weak value of an observable can be obtained without weak measurement. In an interferometric setting, the Kirkwood-Dirac distribution can be constructed from conditional visibility and phase shift. (C) 2021 Elsevier B.V. All rights reserved.
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