Fundamental Bounds in Measurements for Estimating Quantum States

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Quantum measurement unavoidably disturbs the state of a quantum system if any information about the system is extracted. Recently, the concept of reversing quantum measurement has been introduced and has attracted much attention. Numerous efforts have thus been devoted to understanding the fundamental relation of the amount of information obtained by measurement to either state disturbance or reversibility. Here, we experimentally prove the trade-off relations in quantum measurement with respect to both state disturbance and reversibility. By demonstrating the quantitative bound of the trade-off relations, we realize an optimal measurement for estimating quantum systems with minimum disturbance and maximum reversibility. Our results offer fundamental insights on quantum measurement and practical guidelines for implementing various quantum information protocols.
Publisher
AMER PHYSICAL SOC
Issue Date
2014-07
Language
English
Article Type
Article
Keywords

MEASUREMENT REVERSAL; FIDELITY; QUBIT

Citation

PHYSICAL REVIEW LETTERS, v.113, no.2

ISSN
0031-9007
DOI
10.1103/PhysRevLett.113.020504
URI
http://hdl.handle.net/10203/247189
Appears in Collection
PH-Journal Papers(저널논문)
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