Reversing the weak quantum measurement for a photonic qubit

Title
Reversing the weak quantum measurement for a photonic qubit
Authors
김용수조영욱Young-Sik RaYoon-Ho Kim
Issue Date
2009-06
Publisher
Optics express
Citation
VOL 17, NO 14-11985
Abstract
We demonstrate the conditional reversal of a weak (partial-collapse) quantum measurement on a photonic qubit. The weak quantum measurement causes a nonunitary transformation of a qubit which is subsequently reversed to the original state after a successful reversing operation. Both the weak measurement and the reversal operation are implemented linear optically. The state recovery fidelity, determined by quantum process tomography, is shown to be over 94% for partial-collapse strength up to 0.9. We also experimentally study information gain due to the weak measurement and discuss the role of the reversing operation as an information erasure.
URI
http://pubs.kist.re.kr/handle/201004/70514
ISSN
1094-4087
Appears in Collections:
KIST Publication > Article
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