Quantum probing beyond pure dephasing
- URL: http://arxiv.org/abs/2003.04014v2
- Date: Tue, 25 Aug 2020 07:53:21 GMT
- Title: Quantum probing beyond pure dephasing
- Authors: Dario Tamascelli, Claudia Benedetti, Heinz-Peter Breuer, and Matteo
G.A. Paris
- Abstract summary: We analyze the performance of a single-qubit probe in characterizing Ohmic bosonic environments at thermal equilibrium.
In particular, we analyze the effects of tuning the interaction Hamiltonian between the probe and the environment.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Quantum probing is the art of exploiting simple quantum systems interacting
with a complex environment to extract precise information about some
environmental parameters, e.g. the temperature of the environment or its
spectral density. Here we analyze the performance of a single-qubit probe in
characterizing Ohmic bosonic environments at thermal equilibrium. In
particular, we analyze the effects of tuning the interaction Hamiltonian
between the probe and the environment, going beyond the traditional paradigm of
pure dephasing. In the weak-coupling and short-time regime, we address the
dynamics of the probe analytically, whereas numerical simulations are employed
in the strong coupling and long-time regime. We then evaluate the quantum
Fisher information for the estimation of the cutoff frequency and the
temperature of the environment. Our results provide clear evidence that pure
dephasing is not optimal, unless we focus attention to short times. In
particular, we found several working regimes where the presence of a transverse
interaction improves the maximum attainable precision, i.e. it increases the
quantum Fisher information. We also explore the role of the initial state of
the probe and of the probe characteristic frequency in determining the
estimation precision, thus providing quantitative guidelines to design
optimized detection to characterize bosonic environments at the quantum level.
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