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Quantum measurements of sums

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Title
Quantum measurements of sums
Author(s)
Juzar Thingna; Peter Talkner
Subject
QUANTUM MEASUREMENT, ; BAND-LIMITED FUNCTIONS, ; QUBITS
Publication Date
2020-07
Journal
PHYSICAL REVIEW A, v.102, no.1, pp.012213
Publisher
AMER PHYSICAL SOC
Abstract
© 2020 American Physical Society. A method is proposed that allows one to infer the sum of the values of an observable taken during contacts with a pointer state. Hereby, the state of the pointer is updated while contacted with the system and remains unchanged between contacts while the system evolves in time. After a prescribed number of such contacts, the position of the pointer is determined by means of a projective measurement. The outcome is specified in terms of a probability distribution function for unitary and Markovian dissipative dynamics and compared with the results of the same number of generalized Gaussian measurements of the considered observable. As a particular example, a qubit is considered with an observable contacting to the pointer that does not commute with the system Hamiltonian
URI
https://pr.ibs.re.kr/handle/8788114/7765
DOI
10.1103/PhysRevA.102.012213
ISSN
2469-9926
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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