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DTSTART:20180325T030000
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DTSTART:20181028T020000
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DTSTAMP:20260404T133258Z
UID:5aeaf7333db39438777511@ist.ac.at
DTSTART:20180627T110000
DTEND:20180627T120000
DESCRIPTION:Speaker: Teresa Hönigl-Decrinis\nhosted by Johannes Fink\nAbst
 ract: We report on quantum optics phenomena on chip and their emerging dev
 ices for present and future applications. First\, we demonstrate that when
  a non-linear medium is scaled down to a single quantum scatterer\, a seri
 es of effects beyond classical physics are revealed. In particular\, Quant
 um Wave Mixing (QWM) [1] is a result of elastic scattering of electromagne
 tic waves on a single artificial atom. We investigate two regimes of QWM: 
 Coherent wave mixing and quantum wave mixing with non-classical superposed
  states. In the former\, two pulsed waves with frequencies slightly detune
 d to each other are scattered on the single artificial atom resulting in a
  symmetric spectrum with an infinite number of side peaks. The amplitude o
 f each of these peaks oscillates in time according to Bessel functions wit
 h the orders determined by the number of interacting photons. In the latte
 r regime\, a time delay between the two pulses is introduced causing a str
 iking difference in the spectrum\, which now exhibits a finite number of n
 arrow coherent emission peaks. Furthermore\, the spectrum in the latter re
 gime is asymmetric with the number of positive frequency peaks (due to sti
 mulated emission) always exceeding by one compared to the negative frequen
 cy peaks (due to absorption).Thus in QWM\, the spectrum of elastically sca
 ttered radiation is a fingerprint of the interacting photonic states. More
 over\, the artificial atom visualizes photon-state statistics\, for exampl
 e distinguishing coherent\, one- and two-photon superposed states in the q
 uantum regime. Our results give new insight into nonlinear quantum effects
  in microwave optics with artificial atoms.Then\, we addresses the challen
 ge of measuring the absolute power of a microwave signal in a transmission
  line at cryogenic temperatures which is critical for applications in quan
 tum optics\, quantum computing and quantum information. We demonstrate tha
 t a two-level system strongly coupled to the open space can act as a quant
 um sensor of absolute power [2]. We realise the quantum sensor using a sup
 erconducting flux qubit that is strongly coupled to the environment. The q
 uantum sensor is independent of dephasing of the two-level system.[1] A. Y
 u. Dmitriev et al. Quantum wave mixing and visualisation of coherent and s
 uperposed photonic states in a waveguide. Nature Communications\, 8(1):135
 2\, 2017[2] T. Hnigl-Decrinis et al. Two-level system as a quantum sensor 
 of absolute power. In preparation.?
LOCATION:Big Seminar room Ground floor / Office Bldg West (I21.EG.101)\, IS
 TA
ORGANIZER:sdanzing@ist.ac.at
SUMMARY:Teresa Hönigl-Decrinis: Probing Photonic States and Sensing Absolu
 te Power
URL:https://talks-calendar.ista.ac.at/events/1234
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