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DTSTART:20200329T030000
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DTSTART:20191027T020000
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BEGIN:VEVENT
DTSTAMP:20260404T110048Z
UID:5c5c38a48b7bc022406759@ist.ac.at
DTSTART:20191119T110000
DTEND:20191119T120000
DESCRIPTION:Speaker: Jeremie Viennot\nhosted by Andrew Higginbotham\nAbstra
 ct: Low frequency massive mechanical oscillators are extremely sensitive d
 etectors of force and strain\, and their performances could now be pushed 
 further by preparing them into quantum states. However\, the linear parame
 tric coupling of these oscillators to microwave and optical light has been
  so far insufficientto prepare them into quantum states. To go beyond the 
 limitations of such linear coupling schemes\, we quadratically couple the 
 displacement of a 25 MHz oscillator to a superconducting qubit with a 4 GH
 z transition frequency [1]. This quadratic interaction enables direct cont
 rol over the oscillator's energy distribution. We squeeze this distributio
 n by adiabatically adjusting dissipative reservoirs corresponding to drive
 n qubit-oscillator sideband transitions. The large coupling strength betwe
 en the qubit and the oscillator places the system in a dispersive ultra-st
 rong coupling limit at large phonon numbers. We explore this new limit and
  we demonstrate the preparation and detection of non-classical states\, ch
 aracterized by a large mean phonon number and a comparatively small varian
 ce in phonon distribution [2]. These sub-Poissonian states could potential
 ly be used to enhance the sensitivity of force detection. [1] J. J. Vienno
 t et al.\, Phys. Rev. Lett 121 (18)\, 183601 (2018)[2] X. Ma et al. (in pr
 eparation)
LOCATION:Heinzel Seminar Room / Office Bldg West (I21.EG.101)\, ISTA
ORGANIZER:swiddman@ist.ac.at
SUMMARY:Jeremie Viennot: Phonon-number squeezing beyond the classical limit
URL:https://talks-calendar.ista.ac.at/events/2047
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