1 / 8

Phase-slip Oscillator

Phase-slip Oscillator. Alina M. Hriscu, Yuli V. Nazarov Kavli Institute for Nanoscience, TU Delft. Acknowledgements : Hans Mooij, Kees Harmans, Ad Verbruggen, Tomoko Fuse. (quantum) Phase-slips. Introduction. Superconducting wires : d≈10 nm resistance below Tc

grant
Download Presentation

Phase-slip Oscillator

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Phase-slip Oscillator Alina M. Hriscu, Yuli V. Nazarov Kavli Institute for Nanoscience, TU Delft Acknowledgements: Hans Mooij, Kees Harmans, Ad Verbruggen, Tomoko Fuse

  2. (quantum) Phase-slips Introduction • Superconducting wires : d≈10 nm • resistance below Tc • Thermally-activated phase-slips • 2pslip of the phase => "phase-slip“ • Quantum phase-slips • proposed for qu-bit • coherent! • not experimentally confirmed yet time Mooij and Harmans (2005) Schön (2000) • Our idea: other means of sensitive measurements?

  3. Phase-slip oscillator Damped LC oscillator + phase-slip wire Γ : OSCILLATOR QUALITY ES=0 ES≠0 n=… n=1 n=0

  4. Unusual non-linearities • Correction to the energy levels phase-slip amplitude charge Gate voltage sensitivity Unusual non-linearities • More interesting problem

  5. Intermezzo: Non-linearities Duffing oscillator Phase-slip oscillator Usual Unusual Resonance spectrum Non-linearities ?

  6. Phase-slip Oscillator: Results I. Semiclassical Lorentzian “Corkscrew” NO non-linearities UNUSUAL non-linearities 0 Numberof photons N= <n> w Detuning • Multiple solutions • Enables experimental detection

  7. Phase-slip Oscillator: Results II. Quantum ? 1 semiclassical metastable state 1SINGLE quantum state • Confirms existence of meta-stable states • Hysteresis • Long life-times Pure states • Slow switching Semiclassical prediction Quantum : loops n YES!

  8. Phase-slip oscillator Conclusions • Novel system in superconducting electronics • Unusual non-linearities • At small number of photons • Tunable with • Usable in many applications • ultrasensitive measurements, quantum manipulation, etc. • Detection of quantum phase-slip • Oscillatory dependence on gate voltage • Measurement of responses of the oscillator http://arxiv.org/abs/0912.3699(Submitted to PRL)

More Related