US 12,111,205 B2
Device and method for detecting single microwave photons
Raphaël Lescanne, Le Kremelin-Bicetre (FR); Samuel Deleglise, Paris (FR); Emmanuel Flurin, Paris (FR); and Zaki Leghtas, Paris (FR)
Assigned to CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR); SORBONNE UNIVERSITE, Paris (FR); COLLEGE DE FRANCE, Paris (FR); and ECOLE NORMALE SUPERIEURE, Paris (FR)
Appl. No. 17/414,588
Filed by CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR); SORBONNE UNIVERSITE, Paris (FR); COLLEGE DE FRANCE, Paris (FR); and ECOLE NORMALE SUPERIEURE, Paris (FR)
PCT Filed Dec. 17, 2019, PCT No. PCT/EP2019/085695
§ 371(c)(1), (2) Date Jun. 16, 2021,
PCT Pub. No. WO2020/127299, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 1873288 (FR), filed on Dec. 19, 2018.
Prior Publication US 2022/0057261 A1, Feb. 24, 2022
Int. Cl. G01J 1/00 (2006.01); G01J 1/44 (2006.01)
CPC G01J 1/44 (2013.01) [G01J 2001/442 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A superconducting device for detection of a single microwave photon, the device comprising:
a quantum system with two energy levels, of which the ground state and an excited state are controllable and detectable, the transition between the ground and excited state having an angular frequency ωq;
a buffer resonator arranged to receive an incident single microwave photon and having an angular frequency ωb;
a dissipative auxiliary resonator arranged to discharge a photon at a rate κw and having an angular frequency ωw; and
readout means arranged for detecting the state of the two-level quantum system;
in which the buffer resonator and the auxiliary resonator are coupled to the quantum system;
the quantum system being suitable for allowing a modulable three-wave interaction between the buffer resonator, the auxiliary resonator, and the quantum system; and
in which the excited state of the quantum system and the photon of the auxiliary resonator are created at a rate Γ, such that Γ<κw, in response to the reception of the incident photon in the buffer resonator and to the application of parametric pumping to the quantum system, to the buffer resonator, or to the auxiliary resonator, the parametric pumping being carried out by means of a microwave field having an angular frequency ωp=ωq+ωw−ωb.