2017/03/31 by Yuxiang Yang, Giulio Chiribella, Masahito Hayashi · 1 citation
Mathematics · Physics and Astronomy · #Advanced Frequency and Time Standards #Algorithm #Atomic and Subatomic Physics Research #Computer science #Mathematics #Measure (data warehouse) #Physics #Quantum #Quantum algorithm #Quantum computer #Quantum error correction #Quantum mechanics #Quantum network #Quantum optics and atomic interactions #Statistical physics #Statistics #Stopwatch #quant-ph
paper · pdf · doi:10.1098/rspa.2017.0773
published as Proceedings of the Royal Society A, 474, 20170773 (2018) · 10 + 5 pages, 3 figures
openalex publication_date 2018/05/01 · arxiv created 2019/01/26 · arxiv updated 2019/01/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Quantum mechanics imposes a fundamental trade-off between the accuracy of time measurements and the size of the systems used as clocks. When the measurements of different time intervals are combined, the errors due to the finite clock size accumulate, resulting in an overall inaccuracy that grows with the complexity of the set-up. Here, we introduce a method that, in principle, eludes the accumulation of errors by coherently transferring information from a quantum clock to a quantum memory of the smallest possible size. Our method could be used to measure the total duration of a sequence of events with enhanced accuracy, and to reduce the amount of quantum communication needed to stabilize clocks in a quantum network.