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BEGIN:VEVENT
DTSTAMP:20260525T192946Z
DTSTART;VALUE=DATE-TIME:20230616T130000
DTEND;VALUE=DATE-TIME:20230616T140000
SUMMARY:Theory group seminar on "Quantum electrodynamics of non-demolitio
 n detection of single microwave photon by superconducting qubit array" S
 peaker: Patrick Navez\, Loughborough University.
TZID:Europe/London
UID:20230616-8a17841a884dd5d3018867e27eb1596c@warwick.ac.uk
CREATED:20230529T142358Z
DESCRIPTION:Abstract Single particle detection is one of the most fundame
 ntal issues in quantum mechanics as it addresses the question of quantum
  measurement. An accurate quantum description of a detector would avoid 
 the use of the Born rule (or von Neumann postulate) about the probabilit
 ies of different outcomes\, leading to the controversial interpretation 
 of the collapse of the wave packet or the Schrodinger's cat. In this tal
 k\, we apply consistently the formalism of quantum electrodynamics and w
 e developed a comprehensive theoretical framework describing the interac
 tion of single microwave photons with an array of superconducting transm
 on qubits in a waveguide cavity resonator. In particular\, we analyse th
 e effects of microwave photons on the array’s response to a weak probe s
 ignal exciting the resonator. The study reveals that a high quality fact
 or cavities provide better spectral resolution of the response\, while c
 avities with moderate quality factor allow better sensitivity for a sing
 le photon detection. Remarkably\, our analysis showed that a single-phot
 on signal can be detected by even a sole qubit in cavity under the reali
 stic range of system parameters. We also discuss how quantum properties 
 of the microwave radiation and electrodynamical properties of resonators
  affect the response of qubits’ array. Our results provide an efficient 
 theoretical background for informing the development and design of quant
 um devices consisting of arrays of qubits\, especially for those using a
  cavity where an explicit expression for the transmission or reflection 
 is required.
LOCATION:PS 128
CATEGORIES:Theory Seminar
LAST-MODIFIED:20230529T142358Z
ORGANIZER;CN=Elnaz Darsheshdar:
END:VEVENT
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