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DTSTAMP:20260427T100747Z
UID:59aad8b00a79a583093836@ist.ac.at
DTSTART:20170907T111500
DTEND:20170907T121500
DESCRIPTION:Speaker: Johannes Majer\nhosted by Johannes Fink\nAbstract: Hyb
 rid quantum systems based on spin-ensembles coupled to superconducting mic
 rowave cavities are promising candidates for robust experiments in cavity 
 quantum electrodynamics (QED) and for future technologies employing quantu
 m mechanical effects. In particular the electron spins hosted by nitrogen-
 vacancy centers in diamond [1]. The main source of decoherence in this sys
 tems is inhomogeneous dipolar spin broadening and a full understanding of 
 the complex dynamics is essential and has not been addressed in recent stu
 dies yet. We investigate the influence of a non-Lorentzian spectral spin d
 istribution in the strong coupling regime of cavity QED. We show experimen
 tally how the so-called cavity protection effect influences the decay rate
  of coherent Rabi oscillation by varying the coupling strength in our expe
 riment [2]. We then demonstrate how the Rabi oscillation amplitude can be 
 enhanced by two orders of magnitude by pulsing the strongly coupled system
  matching a special resonance condition.\n\nFurthermore\, we show that by 
 burning narrow spectral holes into a spin ensemble we create long-lived co
 llective dark states [3]. We observe long-lived Rabi oscillations with hig
 h visibility and a decay rate that is a factor of forty smaller than the s
 pin ensemble linewidth and thereby more than a factor of three below the p
 ure cavity dissipation rate. Additionally\, I will discuss the possibility
  of coupling spin ensembles over large distances using the cavity as a qua
 ntum bus[4].\n\n[1] R. Amsüss\, Ch. Koller\, T. Nöbauer\, S. Putz\, S. R
 otter\, K. Sandner\, S. Schneider\, M. Schramböck\, G. Steinhauser\, H. R
 itsch\, J. Schmiedmayer\, and J. Majer\, Phys. Rev. Lett. 107\, 060502 (2
 011) [2] S. Putz\, D. O. Krimer\, R. Amsuss\, A. Valookaran\, T. Nobauer\,
  J. Schmiedmayer\, S. Rotter\, and J. Majer\, Nature Physics 10\, 720-724
  (2014)  [3] S. Putz\, A. Angerer\, D.O. Krimer\, R. Glattauer\, W.J. Mun
 ro\, S.Rotter\, J. Schmiedmayer\, and J. Majer\, Nature Photonics 11\, 36
 -39 (2017) [4] T. Astner\, S. Nevlacsil\, N. Peterschofsky\, A. Angerer\, 
 S. Rotter\, S. Putz\, J. Schmiedmayer\, and J. Majer\, Phys. Rev. Lett. 1
 18\, 140502 (2017)\n
LOCATION:Mondi Seminar Room 2\, Central Building\, ISTA
ORGANIZER:jdeanton@ist.ac.at
SUMMARY:Johannes Majer: Hybrid Quantum Systems: Coupling Diamond Color Cent
 ers to Superconducting Cavities
URL:https://talks-calendar.ista.ac.at/events/808
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