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Quantum watch and its intrinsic proof of accuracy

Marta Berholts1,2,*, Ronny Knut1,†, Robert Stefanuik1, Hampus Wikmark1, Susmita Saha1,3, and Johan Söderström1,‡

  • 1Department of Physics and Astronomy, University of Uppsala, SE-75120 Uppsala, Sweden
  • 2Department of Physics, University of Tartu, EST-50411 Tartu, Estonia
  • 3Department of Physics, Ashoka University, IN-131029 Sonipat, India

  • *Corresponding author: marta.berholts@gmail.com
  • †ronny.knut@physics.uu.se
  • ‡johan.soderstrom@physics.uu.se
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Phys. Rev. Research 4, 043041 – Published 18 October, 2022

DOI: https://doi.org/10.1103/PhysRevResearch.4.043041

Abstract

We have investigated the rich dynamics of complex wave packets composed of multiple high-lying Rydberg states in He. A quantitative agreement is found between theory and time-resolved photoelectron spectroscopy experiments. We show that the intricate time dependence of such wave packets can be used for investigating quantum defects and performing artifact-free timekeeping. The latter relies on the unique fingerprint that is created by the time-dependent photoionization of these complex wave packets. These fingerprints determine how much time has passed since the wave packet was formed and provide an assurance that the measured time is correct. Unlike any other clock, this quantum watch does not utilize a counter and is fully quantum mechanical in its nature. The quantum watch has the potential to become an invaluable tool in pump-probe spectroscopy due to its simplicity, assurance of accuracy, and ability to provide an absolute timestamp, i.e., there is no need to find time zero.

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Phys. Rev. Research 4, 043041– Published 18 October, 2022
  • Received 25 January 2022
  • Accepted 17 August 2022
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