Funding period: 2021 – 2024

Project leader: Guido Burkard

Scientific staff: Emanuel Hubenschmid, Andrey Moskalenko (collaborator)

Former members: Thiago Lucena de Macedo Guedes, Matthias Kizmann, Philipp Mutter

In this project, we will develop a theoretical framework to describe ultrabroadband electro-optic sampling processes and a variety of quantum fluctuation phenomena and quantum measurement protocols that can be realized with them, specifically the measurement back-action effect, the simultaneous measurement of incompatible observables, and multi-time correlation functions. We will also explore other areas where quantum measurements of the electromagnetic field can be implemented, in particular microwave circuit quantum electrodynamics with solid-state systems.

List of publications 

Current preprints 

• Optical time-domain quantum state tomography on a subcycle scale
  E. Hubenschmid, T. L. M. Guedes, and G. Burkard
  arXiv:2307.13090 - published 24 July 2023

2023

• Transmission-based noise spectroscopy for quadratic qubit-resonator interactions
  Philipp M. Mutter and Guido Burkard
  Phys. Rev. A 107, 052603 - published 04 May 2023
   
• Back action in quantum electro-optic sampling of electromagnetic vacuum fluctuations
  T. L. M. Guedes, I. Vakulchyk, D. V. Seletskiy, A. Leitenstorfer, A. S. Moskalenko, and G. Burkard
  Phys. Rev. Research 5, 013151 - published 27 February 2023
  related also to project A06
   
• Theory of qubit noise characterization using the long-time cavity transmission
  Philipp M. Mutter and Guido Burkard
  Phys. Rev. A 107, 022601 - published 1 February 2023

2022

• Complete positive operator-valued measure description of multichannel quantum electro-optic sampling with monochromatic field modes
  E. Hubenschmid, T. L. M. Guedes, G. Burkard
  Phys. Rev. A 106, 043713 - published 19 October 2022
   
• Fingerprints of Qubit Noise in Transient Cavity Transmission
  P. M. Mutter and G. Burkard
  Phys. Rev. Lett. 128, 236801 – published 8 June 2022
   
• Realizing a rapidly switched Unruh-DeWitt detector through electro-optic sampling of the electromagnetic vacuum
  S. Onoe, T. L. M. Guedes, A.S. Moskalenko, A. Leitenstorfer, G. Burkard, T.C. Ralph
  Phys. Rev. D 105, 056023 - published 29 March 2022
   
• Quantum Susceptibilities in Time-Domain Sampling of Electric Field Fluctuations
  M. Kizmann, A. S. Moskalenko, A. Leitenstorfer, G. Burkard, and S. Mukamel
  Laser Photonics Rev. 2022, 2100423 – published 22 January 2022

2021

• Quasiclassical theory of non-adiabatic tunneling in nanocontacts induced by phase-controlled ultrashort light pulses
  S. Kim, T. Schmude, G. Burkard, and A.S. Moskalenko
  New J. Phys. 23, 083006 – published 5 August 2021
   
• Crosstalk analysis for single-qubit and two-qubit gates in spin qubit arrays
  I. Heinz and G. Burkard
  Phys. Rev. B 104, 045420 – published 4 July 2021

Further Publications 

• Paraxial Theory of Direct Electro-optic Sampling of the Quantum Vacuum
  A. S. Moskalenko, C. Riek, D. V. Seletskiy, G. Burkard, and A. Leitenstorfer
  Phys. Rev. Lett. 115, 263601 – published 28 December 2015
   
• Direct sampling of electric-field vacuum fluctuations
  C. Riek, D. V. Seletskiy, A. S. Moskalenko, J. F. Schmidt, P. Krauspe, S. Eckart, S. Eggert, G. Burkard, and A. Leitenstorfer 
  Science 350, 420 - published 1 October 2015
   
• Subcycle quantum electrodynamics
  C. Riek, P. Sulzer, M. Seeger, A. S. Moskalenko, G. Burkard, D. V. Seletskiy & A. Leitenstorfer 
  Nature 541, 376 - published 19 January 2017
   
• Spectra of Ultrabroadband Squeezed Pulses and the Finite-Time Unruh-Davies Effect
  T. L. M. Guedes, M. Kizmann, D. V. Seletskiy, A. Leitenstorfer, Guido Burkard, and A. S. Moskalenko
  Phys. Rev. Lett. 122, 053604 – published 8 February 2019
   
• Subcycle squeezing of light from a time flow perspective
  M. Kizmann, T. L. de M. Guedes, D. V. Seletskiy, A. S. Moskalenko, A. Leitenstorfer & G. Burkard 
  Nature Physics 15, 960 - published 1 July 2019