DFG Projects - Quantum Optics in Atmospheric Channels

Fundamentals of Quantum Communication through Atmospheric Channels

VO 501/21-1

The main purpose of the proposed project is to gain deep insight in the effects of turbulent atmospheric channels on the quantum properties of the transmitted light. Hence our focus is on the theoretical understanding of the ''Fundamentals of Quantum Communication through Atmospheric Channels''. This requires a general description of atmospheric channels for the purpose to consistently describe the quantum properties of the transmitted light, which will be based on a close cooperation with experimental groups. The results of this research will be the basis for developing efficient methods of free-space communication. To establish optimized communication protocols, we plan to explore the advantages of atmospheric channels based on the post-selection of the events with high transmission coefficients. This ensures a high-fidelity transfer of nonclassical properties of quantum light, such as squeezing, entanglement, and others. In this context we also plan to identify and characterize the optimal measurement techniques for the use in atmospheric quantum channels.

staff

Dr. Dmytro Vasylyev

Full Characterization of the Quantum Effects of Light after Transmission through the Atmosphere

VO 501/22-1

The main purpose of the proposed project is the ''Full Characterization of the Quantum Effects of Light after Transmission through the Atmosphere''. In the present literature this complex problem has not been studied yet. Besides efficient methods of characterizing the quantum state of light, experimentally applicable methods are needed, which allow recording and processing of data.
First, we want to characterize the nonclassical radiation properties after passing the turbulent atmosphere. For this purpose we will investigate nonclassicality quasiprobabilities, which include the effects of turbulence. This also requires to develop proper measurement strategies and state engineering protocols. Second, we will focus on robust quantum correlation properties of transmitted radiation fields. In this context we characterize and quantify entanglement, using the methods recently developed in the group for optimal witnesses or entanglement quasiprobabilities. We also plan to study general space-time dependent quantum correlations for atmospheric quantum communication.
The results of these investigations are expected to yield a deep understanding of quantum properties in turbulent media. In particular, we plan to identify those types of quantum effects which are most robust against atmospheric disturbances. This knowledge is the basis of powerful methods for quantum communication, ranging from the most suitable data encoding by the sender, the secure data transfer, towards the optimal detection and decoding. Taking into account the atmospheric conditions, turbulence can even serve as a resource for quantum communication.

staff

Dr. Martin Bohmann

Publications

publications within the two projects

VO 501/21-1
  1. D. Vasylyev, W. Vogel, and A. A. Semenov
    Theory of atmospheric quantum channels based on the law of total probability
    Phys. Rev. A 97, 063852 (2018).
  2. D. Vasylyev, A. A. Semenov, W. Vogel, K. Günthner, A. Thurn, Ö. Bayraktar, and Ch. Marquardt
    Free-space quantum links under diverse weather conditions
    Phys. Rev. A 96, 043856 (2017).
  3. M. O. Gumberidze, A. A. Semenov, D. Vasylyev, and W. Vogel
    Bell nonlocality in the turbulent atmosphere
    Phys. Rev. A 94, 053801 (2016)
  4. D. Vasylyev, A. A. Semenov, and W. Vogel
    Atmospheric Quantum Channels with Weak and Strong Turbulence
    Phys. Rev. Lett. 117, 090501 (2016).
VO 501/22-1
  1. M. Bohmann, J. Tiedau, T. Bartley, J. Sperling, C. Silberhorn, and W. Vogel
    Incomplete Detection of Nonclassical Phase-Space Distributions
    Phys. Rev. Lett. 120, 063607 (2018).
  2. P. Thomas, M. Bohmann, and W. Vogel
    Verifying bound entanglement of dephased Werner states
    Phys. Rev. A 96, 042321 (2017).
  3. M. Bohmann, J. Sperling, and W. Vogel
    Entanglement verification of noisy NOON states
    Phys. Rev. A 96, 012321 (2017)
  4. M. Bohmann, R. Kruse, J. Sperling, C. Silberhorn, and W. Vogel
    Probing free-space quantum channels with laboratory-based experiments
    Phys. Rev. A 95, 063801 (2017)
  5. M. Bohmann, R. Kruse, J. Sperling, C. Silberhorn, and W. Vogel
    Direct calibration of click-counting detectors
    Phys. Rev. A 95, 033806 (2017)
  6. M. Bohmann, J. Sperling, A. A. Semenov, and W. Vogel
    Higher-order nonclassical effects in fluctuating-loss channels
    Phys. Rev. A 95, 012324 (2017)
  7. M. Bohmann, A. A. Semenov, J. Sperling, and W. Vogel
    Gaussian entanglement in the turbulent atmosphere
    Phys. Rev. A 94, 010302(R) (2016).
  8. J. Sperling, M. Bohmann, W. Vogel, G. Harder, B. Brecht, V. Ansari, and C. Silberhorn
    Uncovering Quantum Correlations with Time-Multiplexed Click Detection
    Phys. Rev. Lett. 115, 023601 (2015).
  9. M. Bohmann, J. Sperling, and W. Vogel
    Entanglement and phase properties of noisy NOON states
    Phys. Rev. A 91, 042332 (2015).

Activities

events and activities for the two projects

2018
  1. International Forum for Young Scientists (Scholars) & The Third International Symposium for Young Researchers on Atomic, Molecular, and Optical Physics (ISYRAMO-III)
    Shanghai, China, April 26 - 28, 2018
    • Invited Talk: D. Vasylyev, A. A. Semenov, and W. Vogel, Models of Quantum Atmospheric Channels
  2. International Conference on Quantum Communication, Measurement and Computing (QCMC 2018)
    Baton Rouge, LA, USA, March 12 - 16, 2018
    • Poster: M. Bohmann, A. A. Semenov, J. Sperling, and W. Vogel, Quantum light in atmospheric channels
  3. International Conference on Quantum and Nonlinear Optics (QNO) 2018
    Kuala Lumpur, Malaysia, February 2 - 5, 2018
    • Contributed Talk: M. Bohmann, P. Thomas, and W. Vogel, Verification of bound entanglement by entanglement quasiprobabilities
    • Poster: M. Bohmann, J. Sperling, A. A. Semenov, and W. Vogel, Moment-based characterization of realistic quantum systems
2017
  1. VI Quantum Information School and Workshop
    Paraty, Brazil, August 14 - 25, 2017
    • Poster: M. Bohmann, J. Sperling, A. A. Semenov, and W. Vogel, Moment-based characterization of realistic quantum systems
    • Poster: M. Bohmann, J. Sperling, A. A. Semenov, and W. Vogel, Quantum light in atmospheric channels
  2. Quantum 2017, conference
    Torino, Italy, May 7 - 13, 2017
    • Poster: M. Bohmann, J. Sperling, A. A. Semenov, and W. Vogel, Entanglement and Nonclassicality in Atmospheric Channels
  3. Quantum Information and Measurement (QIM), conference
    Paris, France, April 5 - 7, 2017
    • Poster: M. Bohmann, J. Sperling, A. A. Semenov, and W. Vogel, Atmospheric Quantum Channels for Nonclassical and Entangled Light
2016
  1. research visit: A. A. Semenov and D. Vasylyev, Erlangen, Germany, December 7 - 9
    • Talk: A. A. Semenov and D. Vasylyev, Nonclassical light in the Atmosphere: Elliptic-Beam Model and Gaussian Entanglement
  2. Quantum Optics VIII 2016, conference
    Maresias, Brazil, October 23 - 28, 2016
    • Poster: M. Bohmann, A. A. Semenov, J. Sperling, and W. Vogel, Gaussian Entanglement in the Turbulent Atmosphere
  3. research visit: D. Vasylyev and A. A. Semenov, Kiev, Ukraine, October 21 - 31
  4. research visit: M. Bohmann and F. Krumm, Paderborn, Germany, October 10 - 14
2015
  1. visiting scientist: Dr. Andrii Semenov (January 18 - February 19)
  2. CERF2015, conference
    Rostock, Germany, September 13 - 18, 2015
    • Poster: M. Bohmann, J. Sperling, and W. Vogel, Entanglement and phase properties of noisy NOON states
    • Poster: D. Vasylyev, A. Semenov, and W. Vogel, Quantum optics in the turbulent atmosphere
  3. research visit: M. Bohmann, Kiev, Ukraine, June 15 - 25
  4. research visit: W. Vogel and M. Bohmann, Rio de Janeiro, Brasil, May 03 - 15
  5. visiting scientist: Dr. Andrii Semenov (January 19 - March 18, 2015)
  6. starting date VO 501/21-1: 02/2015
  7. starting date VO 501/22-1: 01/2015