Quantum Clocks are More Accurate Than Classical Ones
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Author / Producer
Date
2022
Publication Type
Journal Article
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yes
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Abstract
A clock is, from an information-theoretic perspective, a system that emits information about time. One may therefore ask whether the theory of information imposes any constraints on the maximum precision of clocks. Here we show a quantum-over-classical advantage for clocks or, more precisely, the task of generating information about what time it is. The argument is based on information-theoretic considerations: we analyze how the accuracy of a clock scales with its size, measured in terms of the number of bits that could be stored in it. We find that a quantum clock can achieve a quadratically improved accuracy compared to a purely classical one of the same size.
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published
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Journal / series
Volume
3 (1)
Pages / Article No.
10319
Publisher
American Physical Society
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Subject
Quantum channels; Quantum entanglement; Quantum walks
Organisational unit
03781 - Renner, Renato / Renner, Renato
Notes
Funding
165843 - Fully quantum thermodynamics of finite-size systems (SNF)
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