2017
DOI: 10.1103/physreva.96.022127
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Noninvasive measurement of dynamic correlation functions

Abstract: The measurement of dynamic correlation functions of quantum systems is complicated by measurement backaction. To facilitate such measurements we introduce a protocol, based on weak ancilla-system couplings, that is applicable to arbitrary (pseudo)spin systems and arbitrary equilibrium or nonequilibrium initial states. Different choices of the coupling operator give access to the real and imaginary parts of the dynamic correlation function. This protocol reduces disturbances due to the early time measurements t… Show more

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Cited by 25 publications
(59 citation statements)
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“…In this section we briefly summarize the "ideal versions" (without taking into account imperfections and measurement noise) of the ancilla-free measurement protocols put forward in [11,12]. The protocols are applicable to arbitrary Hamiltonians H of interacting spin-1/2 degrees of freedom (qubits), on arbitrary lattices, and for arbitrary initial states.…”
Section: Measuring Dynamic Correlations Of Single-site Spin-1/2 Omentioning
confidence: 99%
See 4 more Smart Citations
“…In this section we briefly summarize the "ideal versions" (without taking into account imperfections and measurement noise) of the ancilla-free measurement protocols put forward in [11,12]. The protocols are applicable to arbitrary Hamiltonians H of interacting spin-1/2 degrees of freedom (qubits), on arbitrary lattices, and for arbitrary initial states.…”
Section: Measuring Dynamic Correlations Of Single-site Spin-1/2 Omentioning
confidence: 99%
“…As discussed in more detail in Refs. [11,12], the statistical error in Im C caused by the finite number of repetitions of the measurement is minimised for the choice of θ = ±π/2.…”
Section: Measuring Dynamic Correlations Of Single-site Spin-1/2 Omentioning
confidence: 99%
See 3 more Smart Citations