Continuous weak measurement of quantum coherent oscillations

By A. N. Korotkov, Dmitri V. Averin. 2000

159 citations recorded by the source corpus.

We consider the problem of continuous quantum measurement of coherent oscillations between two quantum states of an individual two-state system. It is shown that the interplay between the information acquisition and the backaction dephasing of the oscillations by the detector imposes a fundamental limit, equal to four, on the signal-to-noise ratio of the measurement. The limit is universal, e.g., independent of the coupling strength between the detector and system, and results from the tendency of quantum measurement to localize the system in one of the measured eigenstates.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/3f7d995a566e93986536dadbf89e9e5c5467e1bb

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In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

Citations in the corpus

Introduction to quantum noise, measurement, and amplification (2008, methodology): “Somewhat surprisingly, the same maximum peak-to-floor ratio is obtained when one tries to continuously monitor coherent qubit oscillations with a linear detector which is transversely coupled to the qubit (Korotkov and Averin, 2001); this is also a non-QND situation.”
Experimental violation of a Bell’s inequality in time with weak measurement (2010, methodology): “of theoretical calculations [9, 24, 25], and precise knowledge of all sample parameters allows us to obtain for the first time a quantitative comparison with these theories.”