Direct quantum process tomography via measuring sequential weak values of incompatible observables

Title
Direct quantum process tomography via measuring sequential weak values of incompatible observables
Authors
문성욱한상욱김용수조영욱이상윤김요셉김윤호
Issue Date
2018-01
Publisher
Nature Communications
Citation
VOL 9, NO 192-6
Abstract
The weak value concept has enabled fundamental studies of quantum measurement and, recently, found potential applications in quantum and classical metrology. However, most weak value experiments reported to date do not require quantum mechanical descriptions, as they only exploit the classical wave nature of the physical systems. In this work, we demonstrate measurement of the sequential weak value of two incompatible observables by making use of two-photon quantum interference so that the results can only be explained quantum physically. We then demonstrate that the sequential weak value measurement can be used to perform direct quantum process tomography of a qubit channel. Our work not only demonstrates the quantum nature of weak values but also presents potential new applications of weak values in analyzing quantum channels and operations.
URI
http://pubs.kist.re.kr/handle/201004/67223
ISSN
2041-1723
Appears in Collections:
KIST Publication > Article
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