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Title: Non-destructively probing the thermodynamics of quantum systems with qumodes
Authors: Elliott, Thomas J.
Gu, Mile
Thompson, Jayne
Liu, Nana
Keywords: Science::Physics
Issue Date: 2023
Source: Elliott, T. J., Gu, M., Thompson, J. & Liu, N. (2023). Non-destructively probing the thermodynamics of quantum systems with qumodes. AVS Quantum Science, 5(3), 034402-1-034402-8.
Project: MOE-T2EP50221-0005 
Journal: AVS Quantum Science 
Abstract: Quantum systems are by their very nature fragile. The fundamental backaction on a state due to quantum measurement notwithstanding, there is also in practice often a destruction of the system itself due to the means of measurement. This becomes acutely problematic when we wish to make measurements of the same system at multiple times, or generate a large quantity of measurement statistics. One approach to circumventing this is the use of ancillary probes that couple to the system under investigation, and through their interaction, enable properties of the primary system to be imprinted onto and inferred from the ancillae. Here we highlight means by which continuous variable quantum modes (qumodes) can be employed to probe the thermodynamics of quantum systems in and out of equilibrium, including thermometry, reconstruction of the partition function, and reversible and irreversible work. We illustrate application of our results with the example of a spin-1/2 system in a transverse field.
ISSN: 2639-0213
DOI: 10.1116/5.0139099
Schools: School of Physical and Mathematical Sciences 
Organisations: Centre for Quantum Technologies, NUS 
MajuLab, CNRS-UNS-NUS-NTU International Joint Research Unit, UMI 3654 
Rights: © 2023 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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