Discrimination of Ohmic thermal baths by quantum dephasing probes
- URL: http://arxiv.org/abs/2008.02526v2
- Date: Sun, 9 Aug 2020 10:11:34 GMT
- Title: Discrimination of Ohmic thermal baths by quantum dephasing probes
- Authors: Alessandro Candeloro, Matteo G. A. Paris
- Abstract summary: We evaluate the minimum error probability achievable by three different kinds of quantum probes, namely a qubit, a qutrit and a quantum register made of two qubits.
A qutrit probe outperforms a qubit one in the discrimination task, whereas a register made of two qubits does not offer any advantage.
- Score: 68.8204255655161
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We address the discrimination of structured baths at different temperatures
by dephasing quantum probes. We derive the exact reduced dynamics and evaluate
the minimum error probability achievable by three different kinds of quantum
probes, namely a qubit, a qutrit and a quantum register made of two qubits. Our
results indicate that dephasing quantum probes are useful in discriminating low
values of temperature, and that lower probabilities of error are achieved for
intermediate values of the interaction time. A qutrit probe outperforms a qubit
one in the discrimination task, whereas a register made of two qubits does not
offer any advantage compared to two single qubits used sequentially.
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