Speaker
Description
In recent years, quantum thermometry has emerged as a promising approach for achieving precise temperature measurements at the nanoscale, where classical thermometers fail to perform effectively. Quantum probes, such as single- and two-qubit systems, offer a powerful method for accurately measuring the temperature of a bosonic bath. In this talk, I will discuss how the precision of temperature estimation can be improved through the use of quantum Fisher information and the quantum signal-to-noise ratio. A key result is that introducing an ancilla qubit, which mediates the interaction between the probe and the thermal environment, enhances the thermometric sensitivity by encoding temperature information into the coherence of the probe. We further investigate the use of two interacting qubits, either entangled or separated initially, as quantum probes in various environmental configurations.
The findings demonstrate that thermometric precision improves as the system approaches a steady state, governed by the interaction between the qubits. This provides a pathway for efficient low-temperature estimation by tuning the qubit-qubit interaction. The study raises important questions about the role of energy dissipation and resource efficiency in quantum thermometry, which is crucial for developing quantum devices that operate near the quantum limit. These results connect to the broader challenge of optimizing energy consumption in quantum technologies, especially in cryogenic environments where precise temperature control is critical for performance.
Ref: Y. Aiache, A. El Allati, and K. El Anouz, Physical Review A 110, 032605 (2024), https://arxiv.org/abs/2411.05950
| Theme | Theme 3. Theoretical and experimental methods for quantum effects in energy processes |
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