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TT: Fachverband Tiefe Temperaturen

TT 49: Poster Session: Superconductivity

TT 49.31: Poster

Mittwoch, 3. April 2019, 15:00–18:30, Poster D

A superconducting detector that counts microwave photons up to two — •Andrii Sokolov^1,2 and Frank Wilhelm-Mauch¹ — ¹Saarland University, Saarbrücken, Germany — ²Institute of Physics of the National Academy of Sciences, Kyiv, Ukraine

In the last decade, there has been a substantial interest in Josephson junction based detectors. The detectors that have been demonstrated [1, 4] provide no information besides the presence or absence of photons. However, a number resolving photon detector may be of use for optimal discrimination of coherent states [2], qubit readout [3], and various quantum optics experiments in the microwave domain.

To resolve one- and two-photon inputs, we propose to use a two-photon transition. First, at least two photons are necessary to deliver a click. Then, if the detector does not fire, one can quickly tune it such that a single photon is enough to give a click. Using this method, the vacuum state, single-photon state, and states with two and more photons can be distinguished. We present a theory of our detector and evaluate its performance.
Y.-F. Chen et al., Phys. Rev. Lett. 107, 217401, (2011)
Ch. Wittmann et al., Phys. Rev. A 81, 062338 (2010)
A. Sokolov, Phys. Rev. A 93, 032323 (2016)
A. Opremcak et al., Science 361, 1239 (2018)