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SUMMARY:Searching for Dark Matter with Superconducting Qubits
DTSTART;VALUE=DATE-TIME:20211104T020000Z
DTEND;VALUE=DATE-TIME:20211104T033000Z
DTSTAMP;VALUE=DATE-TIME:20260430T023333Z
UID:indico-event-1851@cern.ch
DESCRIPTION:Detection mechanisms for low mass bosonic dark matter 
 candidates\, such the axion or hidden photon\, leverage potential 
 interactions with electromagnetic fields\, whereby the dark matter (of 
 unknown mass) on rare occasion converts into a single photon. Current dark
  matter searches operating at microwave frequencies use a resonant cavity 
 to coherently accumulate the field sourced by the dark matter and a near 
 standard quantum limited (SQL) linear amplifier to read out the cavity 
 signal. To further increase sensitivity to the dark matter signal\, sub-
 SQL detection techniques are required. Here we report the development of a
  novel microwave photon counting technique and a new exclusion limit on 
 hidden photon dark mater. We operate a superconducting qubit to make 
 repeated quantum non-demolition measurements of cavity photons and apply a
  hidden Markov model analysis to reduce the noise to 15.7 dB below the 
 quantum limit\, with overall detector performance limited by a residual 
 background of real photons. With the present device\, we perform a hidden 
 photon search and constrain the kinetic mixing angle to epsilon < 
 1.68x10-15 in a band around 6.011 GHz (24.86 μeV) with an integration 
 time of 8.33 s. This demonstrated noise reduction technique enables future
  dark matter searches to be sped up by a factor of 1\,300. By coupling a 
 qubit to an arbitrary quantum sensor\, more general sub-SQL metrology is 
 possible with the techniques presented in this work.\n\nhttps://agenda.hep
 l.phys.nagoya-u.ac.jp/indico/conferenceDisplay.py?confId=1851
LOCATION:
URL:https://agenda.hepl.phys.nagoya-u.ac.jp/indico/conferenceDisplay.py?con
 fId=1851
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