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- W1843369754 abstract "For continuous weak measurement of qubits, we obtain exact expressions for weak values (WVs) from the post-selection restricted average of measurement outputs, by using both the quantumtrajectory- equation (QTE) and quantum Bayesian approach. The former is applicable to short-time weak measurement, while the latter can relax the measurement strength to finite. We find that even in the very weak limit the result can be essentially different from the one originally proposed by Aharonov, Albert and Vaidman (AAV), in a sense that our result incorporates non-perturbative correction which could be important when the AAV's WV is large. Within the Bayesian framework, we obtain also elegant expressions for finite measurement strength and find that the amplifier's noise in quantum measurement has no effect on the WVs. In particular, we obtain very useful result for homodyne measurement in circuit-QED system, which allows for measuring the real and imaginary parts of the AAV's WV by simply tuning the phase of the local oscillator. This advantage can be exploited as efficient state-tomography technique." @default.
- W1843369754 created "2016-06-24" @default.
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- W1843369754 date "2015-02-09" @default.
- W1843369754 modified "2023-10-14" @default.
- W1843369754 title "Weak values in continuous weak measurement of qubits" @default.
- W1843369754 doi "https://doi.org/10.48550/arxiv.1502.02396" @default.
- W1843369754 hasPublicationYear "2015" @default.
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