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The impact of measurement backaction on many-body virtual transport OZ, A. Carmi, and A. Romito, D. Bischoff, M. Eich , OZ, C. Rssler, T. M. S. Ferguson, L. Camenzind, C. Mueller, B. Braunecker, OZ , and D. Zumb uhl, Phys. Rev. B 90 ,

  1. The impact of measurement backaction on many-body virtual transport OZ, A. Carmi, and A. Romito, D. Bischoff, M. Eich , OZ, C. Rössler, T. M. S. Ferguson, L. Camenzind, C. Mueller, B. Braunecker, OZ , and D. Zumb • uhl, Phys. Rev. B 90 , 205413 (2014); Ihn, K. Ensslin, Nano Lett. 15 , 6003 in preparation Phys. Rev. B 99, 165422 (2019) (2015) QUantum Engineered SysTems (QUEST) Oded Zilberberg

  2. Measurement postulate

  3. Virtual transport

  4. Can a particle collapse under a barrier? See also • E. Condon and P. Morse, RMP 3 , 43 (1931). • E. Wigner, PR 98 , 145 (1955). • M. Büttiker and R. Landauer, PRL 49 , 1739 1982). • M. Büttiker, PRB 27 , 6178 (1983). • D. Sokolovski and L. M. Baskin, PRA 36 , 4604 (1987). • A. M. Steinberg, PRL 74 , 2405 (1995).

  5. Many-body virtual transport 𝜐 ≈ ℏ/Δ𝐹 cotunneling OZ, A. Carmi, and A. Romito, Phys. Rev. B 90 , 205413 (2014)

  6. Many-body virtual transport 𝜐 ≈ ℏ/Δ𝐹 see also, Romito and Gefen, PRB 90, 085417 (2014) and talk by A. Steinberg OZ, A. Carmi, and A. Romito, Phys. Rev. B 90 , 205413 (2014)

  7. Many-body detection of virtual transport see also, Non-barking dogs reference in talk of M. Devoret OZ, A. Carmi, and A. Romito, Phys. Rev. B 90 , 205413 (2014)

  8. Many-body detection of virtual transport OZ, A. Carmi, and A. Romito, Phys. Rev. B 90 , 205413 (2014)

  9. Many-body detection of virtual transport OZ, A. Carmi, and A. Romito, Phys. Rev. B 90 , 205413 (2014)

  10. Detailed calculation ahead OZ, A. Carmi, and A. Romito, Phys. Rev. B 90 , 205413 (2014)

  11. Quantum point contact (microscopic approach) Rate equation for a QPC: I S. A. Gurvitz, Phys. Rev.B 56, 15215 (1997)

  12. Quantum point contact (microscopic approach) Rate equation for a QPC: see also, works by A. Korotkov, D. Averin and A. Jordan I S. A. Gurvitz, Phys. Rev.B 56, 15215 (1997)

  13. Microscopic description Calculate the amplitudes for microscopic events OZ, A. Carmi, and A. Romito, Phys. Rev. B 90 , 205413 (2014)

  14. Microscopic description Calculate the amplitudes for microscopic events OZ, A. Carmi, and A. Romito, Phys. Rev. B 90 , 205413 (2014)

  15. Microscopic description – toy model Calculate the amplitudes for microscopic events Assumptions: 1. T=0        2. 0 3. OZ, A. Carmi, and A. Romito, Phys. Rev. B 90 , 205413 (2014)

  16. Microscopic description – backaction I Calculate the amplitudes for microscopic events OZ, A. Carmi, and A. Romito, Phys. Rev. B 90 , 205413 (2014)

  17. Microscopic description – backaction II Calculate the amplitudes for microscopic events OZ, A. Carmi, and A. Romito, Phys. Rev. B 90 , 205413 (2014)

  18. Backaction OZ, A. Carmi, and A. Romito, Phys. Rev. B 90 , 205413 (2014)

  19. Cotunneling time ≈ ℏ/Δ𝐹 OZ, A. Carmi, and A. Romito, Phys. Rev. B 90 , 205413 (2014)

  20. Mesoscopic drag + backaction D. Bischoff, M. Eich, OZ, C. Rössler, T. Ihn, K. Ensslin, Nano Lett. 15, 6003 (2015)

  21. Mesoscopic drag + backaction D. Bischoff, M. Eich, OZ, C. Rössler, T. Ihn, K. Ensslin, Nano Lett. 15, 6003 (2015)

  22. Mesoscopic drag + backaction D. Bischoff, M. Eich, OZ, C. Rössler, T. Ihn, K. Ensslin, Nano Lett. 15, 6003 (2015)

  23. Mesoscopic drag + backaction R. Sanchez, R. Lopez, D. Sanchez, M. Buttiker, Phys. Rev. Lett. 104, 076801 (2010). D. Bischoff, M. Eich, OZ, C. Rössler, T. Ihn, K. Ensslin, Nano Lett. 15, 6003 (2015)

  24. Mesoscopic drag + backaction D. Bischoff, M. Eich, OZ, C. Rössler, T. Ihn, K. Ensslin, Nano Lett. 15, 6003 (2015)

  25. Backaction induced quantum phase transitions Biesinger et al., PRL 115, 106804 (2015) M. S. Ferguson, L. Camenzind, C. Mueller, B. Braunecker, D. Zümbuhl, and OZ , in preparation

  26. Backaction induced quantum phase transitions Biesinger et al., PRL 115, 106804 (2015) M. S. Ferguson, L. Camenzind, C. Mueller, B. Braunecker, D. Zümbuhl, and OZ , in preparation

  27. Backaction induced quantum phase transitions Biesinger et al., PRL 115, 106804 (2015) M. S. Ferguson, L. Camenzind, C. Mueller, B. Braunecker, D. Zümbuhl, and OZ , in preparation

  28. Backaction induced quantum phase transitions Biesinger et al., PRL 115, 106804 (2015) M. S. Ferguson, L. Camenzind, C. Mueller, B. Braunecker, D. Zümbuhl, and OZ , in preparation

  29. Backaction induced quantum phase transitions Biesinger et al., PRL 115, 106804 (2015) see also, talks by M. Devoret, I. Pop, and A. Jordan M. S. Ferguson, L. Camenzind, C. Mueller, B. Braunecker, D. Zümbuhl, and OZ , in preparation

  30. Backaction induced quantum phase transitions Biesinger et al., PRL 115, 106804 (2015) see also, talks by M. Devoret, I. Pop, and A. Jordan M. S. Ferguson, L. Camenzind, C. Mueller, B. Braunecker, D. Zümbuhl, and OZ , in preparation

  31. Backaction induced quantum phase transitions Comapre with, Goldstein, Berkovits and Gefen, PRL 104, 226805 (2010) M. S. Ferguson, L. Camenzind, C. Mueller, B. Braunecker, D. Zümbuhl, and OZ , in preparation

  32. Backaction induced quantum phase transitions M. S. Ferguson, L. Camenzind, C. Mueller, B. Braunecker, D. Zümbuhl, and OZ , in preparation

  33. Backaction induced quantum phase transitions M. S. Ferguson, L. Camenzind, C. Mueller, B. Braunecker, D. Zümbuhl, and OZ , in preparation

  34. Backaction induced quantum phase transitions M. S. Ferguson, L. Camenzind, C. Mueller, B. Braunecker, D. Zümbuhl, and OZ , in preparation

  35. Credits Quantum measurements Measurement backaction Assaf Carmi Yuval Gefen Alessandro Romito Consumer physics, Weizmann Lancaster Inc. Mesoscopic drag Klaus Ensslin Thomas Ihn Dominik Bischoff Marius Eich Clemens Rössler ETH ETH Axpo group ETH Infenion Population switching Michael S. Ferguson Clemens Mueller Bernd Braunecker Leon Camenzind Dominik Zümbuhl ETH IBM Zurich St. Andrews Basel Basel

  36. Summary Quantum measurements Measurement backaction OZ, A. Carmi, and A. Romito, Phys. Rev. B 90 , 205413 (2014); OZ and A. Romito; Phys. Rev. B 99, 165422 (2019) OZ, B. Braunecker, and D. Loss, P hys. Rev. A 77 , 012327 (2008); OZ, A. Romito, and Y. Gefen, Phys. Rev. Lett. 106 , 080405 (2011); OZ, A. Romito, D. J. Starling, G. A. Howland, C. J. Broadbent, J. C. Howell, and Y. Gefen, Phys. Rev. Lett. 110 , 170405 (2013); Mesoscopic drag OZ, A. Romito, and Y. Gefen, Physica Scripta T151 , 014014 (2012); OZ, A. Romito, and Y. Gefen, Phys. Rev. B 93 , 115411 (2016); Population switching D. Bischoff, M. Eich, OZ, C. Rössler, T. Ihn, K. Ensslin, Nano Lett. 15, 6003 (2015) M. S. Ferguson, L. Camenzind, C. Mueller, B. Braunecker, D. Zümbuhl, and OZ , in preparation

  37. The QUEST continues Thank you!

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