Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Novel approaches to optomechanical transduction

138 views

Published on

Slides for a presentation I gave at the Spring meeting of the German Physical Society in Mainz on March 10, 2017.
In the presentation, I discuss new approaches to frequency conversion of electromagnetic fields using optomechanical interaction. The main figure of merit we are trying to optimize is the transduction bandwidth. I show that the bandwidth can be enhanced by using spatially adiabatic state transfer in an array of conventional optomechanical transducers.

Published in: Science
  • Be the first to comment

  • Be the first to like this

Novel approaches to optomechanical transduction

  1. 1. Novel approaches to optomechanical transduction Ondřej Černotík and Klemens Hammerer Institut für Theoretische Physik, Leibniz Universität Hannover DPG Frühjahrstagung Mainz, 10 March 2017
  2. 2. Ondrej Cernotík (Hannover): Novel approaches to optomechanical transductionˇˇ Superconducting systems are among the best candidates for quantum computers. 2 R. Schoelkopf Light is ideal for quantum communication owing to low losses and noise. A. Zeilinger
  3. 3. Ondrej Cernotík (Hannover): Novel approaches to optomechanical transductionˇˇ Mechanical oscillators can mediate coupling between microwaves and light. 3 R. Andrews et al., Nature Phys. 10, 321 (2014)
  4. 4. Ondrej Cernotík (Hannover): Novel approaches to optomechanical transductionˇˇ Mechanical oscillators can mediate coupling between microwaves and light. 4 R. Andrews et al., Nature Phys. 10, 321 (2014)a1,out a2,outa2,in a1,in a1 a2 g2 g1 b H = g1(a† 1b + b† a1) + g2(a† 2b + b† a2) ˙a(t) = Aa(t) + Bain(t) aout(t) = Ca(t) + Dain(t) aout(!) = S(!)ain(!) = [D C(A + i!1)B]ain(!)
  5. 5. Ondrej Cernotík (Hannover): Novel approaches to optomechanical transductionˇˇ Mechanical oscillators can mediate coupling between microwaves and light. 5 R. Andrews et al., Nature Phys. 10, 321 (2014)a1,out a2,outa2,in a1,in a1 a2 g2 g1 b H = g1(a† 1b + b† a1) + g2(a† 2b + b† a2) g2 1 1 + g2 2 2 ⌧ i L. Tian, PRL 108, 153604 (2012) Y.-D. Wang and A.A. Clerk, PRL 108, 153603 (2012) g2 1 1 = g2 2 2 Impedance matching i ⌧ !mResolved-sideband regime Strong cooperativity Ci = 4g2 i i ¯n 1
  6. 6. Ondrej Cernotík (Hannover): Novel approaches to optomechanical transductionˇˇ 6 Better performance can be achieved by optimizing for a specific task. - O. Cernotík and K. Hammerer, PRA 94, 012340 (2016)ˇ | 0i = (|0i + |1i)(|0i + |1i) ! 8 < : |00i |11i |01i + |10i / h 1 z + 2 zi
  7. 7. Ondrej Cernotík (Hannover): Novel approaches to optomechanical transductionˇˇ 7 We can also use new designs to improve efficiency and bandwidth. z H = g1(z)(a† 1b + b† a1) + g2(z)(a† 2b + b† a2)
  8. 8. Ondrej Cernotík (Hannover): Novel approaches to optomechanical transductionˇˇ g1 g2 8 Highly efficient transduction is possible using adiabatic state transfer. L. Tian, PRL 108, 153604 (2012) Y.-D. Wang and A.A. Clerk, PRL 108, 153603 (2012) z H = q g2 1(z) + g2 2(z)(d† 1b + b† d1) d1 = 1 p g2 1(z) + g2 2(z) [g1(z)a1 + g2(z)a2] d2 = 1 p g2 1(z) + g2 2(z) [g2(z)a1 g1(z)a2]
  9. 9. Ondrej Cernotík (Hannover): Novel approaches to optomechanical transductionˇˇ 9 Transducer bandwidth can be increased by increasing the array size.
  10. 10. Ondrej Cernotík (Hannover): Novel approaches to optomechanical transductionˇˇ 10 Reflection from a large number of cavities introduces a phase shift.
  11. 11. Ondrej Cernotík (Hannover): Novel approaches to optomechanical transductionˇˇ 11 High conversion efficiency is possible in presence of losses and noise. ¯n ⌧ gi 4g2 i i ¯n 1 4g2 i i ¯n 1 i ⌧ !m i ⌧ !m i, ! ⌧ !m i ⌧ gi int ⌧ i ( int ⌧ i prop ⌧ g2 i i Temporal adiabatic Single transducer Transducer array Mechanical noise Counterrotating terms Optical losses
  12. 12. Ondrej Cernotík (Hannover): Novel approaches to optomechanical transductionˇˇ 12 We must also limit backscattering. RL ⌘ = L R ⌧ 1Needs
  13. 13. Ondrej Cernotík (Hannover): Novel approaches to optomechanical transductionˇˇ 13 Transducer array is an interesting platform for frequency conversion. + Large bandwidth + Multimode operation - Needs an array - Phase shift
  14. 14. Ondrej Cernotík (Hannover): Novel approaches to optomechanical transductionˇˇ 14 Generalizations of the system are possible. • Continuum implementation
 P. Rakich and F. Marquadt, arXiv:1610.03012
 H. Zoubi and K. Hammerer, PRA 94, 053827 (2016) • Spatially adiabatic dynamics

×