Bojer M, Friedenberger A, Lutz E (2019)
Publication Type: Journal article
Publication year: 2019
Book Volume: 3
Journal Issue: 6
We evaluate the quantum witness based on the no-signaling-in-time condition of a damped two-level system for nonselective generalized measurements of varying strength. We explicitly compute its dependence on the measurement strength for a generic example. We find a vanishing derivative for weak measurements and an infinite derivative in the limit of projective measurements. The quantum witness is hence mostly insensitive to the strength of the measurement in the weak measurement regime and displays a singular, extremely sensitive dependence for strong measurements. We finally relate this behavior to that of the measurement disturbance defined in terms of the fidelity between pre-measurement and post-measurement states.
APA:
Bojer, M., Friedenberger, A., & Lutz, E. (2019). Quantum witness of a damped qubit with generalized measurements. Journal of Physics Communications, 3(6). https://dx.doi.org/10.1088/2399-6528/ab2209
MLA:
Bojer, Manuel, Alexander Friedenberger, and Eric Lutz. "Quantum witness of a damped qubit with generalized measurements." Journal of Physics Communications 3.6 (2019).
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