Single-qubit thermometry

Jevtic, Sania, Newman, David, Rudolph, Terry and Stace, T.M (2015) Single-qubit thermometry. Physical Review A - Atomic, Molecular, and Optical Physics, 91 1: . doi:10.1103/PhysRevA.91.012331

Author Jevtic, Sania
Newman, David
Rudolph, Terry
Stace, T.M
Title Single-qubit thermometry
Journal name Physical Review A - Atomic, Molecular, and Optical Physics   Check publisher's open access policy
ISSN 1094-1622
Publication date 2015-01-22
Year available 2015
Sub-type Article (original research)
DOI 10.1103/PhysRevA.91.012331
Open Access Status DOI
Volume 91
Issue 1
Total pages 4
Place of publication College Park, United States
Publisher American Physical Society
Language eng
Abstract Distinguishing hot from cold is the most primitive form of thermometry. Here we consider how well this task can be performed using a single qubit to distinguish between two different temperatures of a bosonic bath. In this simple setting, we find that letting the qubit equilibrate with the bath is not optimal, and depending on the interaction time it may be advantageous for the qubit to start in a state with some quantum coherence. We also briefly consider the case that the qubit is initially entangled with a second qubit that is not put into contact with the bath and show that entanglement allows for even better thermometry.
Keyword Optics
Physics, Atomic, Molecular & Chemical
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID EP/K022512/1
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2016 Collection
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Citation counts: TR Web of Science Citation Count  Cited 12 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 10 times in Scopus Article | Citations
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