QCUMbER

Quantum Controlled Ultrafast Multimode Entanglement and Measurement

Objective

Ultrafast light pulses offer the fascinating opportunity to study system dynamics at ultrashort time scales. Trains of ultrafast light pulses also feature a broad frequency comb structure that has been exploited e.g. in high precision metrology. These characteristics have made ultrafast optics with coherent control techniques a flourishing field in recent years. A rich toolbox has been developed to generate shorter pulses with engineered temporal and spectral properties.

Likewise, exploiting quantum features of light has enabled remarkable progress for the experimental exploration of fundamental physics and has been central to establishing the fields of quantum communication and quantum metrology. This proposal aims to bring together these two vibrant fields with the goal of exploring new capabilities that arise from the interplay of the quantum properties of light at extreme timescales and over extremely broad spectra. Ultrafast quantum pulses feature an inherent non-classical pulse-mode or supermode structure, which is imprinted onto the states in the generation process and is closely related to the entanglement properties between different frequency constituents of the quantum pulses. Harnessing this structure will dramatically enhance quantum channel capacities per signal state, enable precision time-frequency measurements beyond classical boundaries and open new avenues to scalable quantum information processing.

Each partner brings unique expertise from the areas of quantum information, ultrafast and quantum optics, which expands the combined knowledge of the consortium. The partners' research profiles cover engineered integrated optics with pulsed light, quantum communication systems, coherent control of light matter interaction and continuous variable quantum states. Experience in classical ultrafast pulse-shaping as well as advanced theoretical analysis tools addressing high-dimensional entanglement and multimode photon statistics round out the consortium.

Project consortium

coordinator: Brian Smith (UOXF)
partner (experiment): Oxford (UOXF), Paris (UPMC), Paderborn (UPB), and Roma (ROMA3)
partner (theory): Lille (USTL) and Rostock (UROS)

Acknowledgements

This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 665148.

UROS staff

Benjamin Kühn (left)
and Stefan Gerke (right)

Publications

publications of partner UROS

Since September 2015
  1. T. Lipfert, F. Krumm, M. I. Kolobov, and W. Vogel
    Time ordering in the classically driven nonlinear Jaynes-Cummings model
    Phys. Rev. A 98, 063817 (2018).
  2. B. Kühn and W. Vogel
    Preparation of arbitrary quantum states with regular P functions
    Phys. Rev. A 98, 053807 (2018).
  3. S. Gerke, W. Vogel, and J. Sperling
    Numerical Construction of Multipartite Entanglement Witnesses
    Phys. Rev. X 8, 031047 (2018).
  4. B. Kühn and W. Vogel
    Full statistics of homodyne correlation measurements
    Phys. Rev. A 98, 013832 (2018).
  5. 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).
  6. B. Kühn and W. Vogel
    Quantum non-Gaussianity and quantification of nonclassicality
    Phys. Rev. A 97, 053823 (2018).
  7. F. Krumm and W. Vogel
    Time-dependent nonlinear Jaynes-Cummings dynamics of a trapped ion
    Phys. Rev. A 97, 043806 (2018).
  8. O. P. Kovalenko, J. Sperling, W. Vogel, and A. A. Semenov
    Geometrical picture of photocounting measurements
    Phys. Rev. A 97, 023845 (2018).
  9. 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).
  10. E. Agudelo, J. Sperling, L. S. Costanzo, M. Bellini, A. Zavatta, and W. Vogel
    Conditional Hybrid Nonclassicality
    Phys. Rev. Lett. 119, 120403 (2017).
  11. B. Kühn, W. Vogel, and J. Sperling
    Displaced photon-number entanglement tests
    Phys. Rev. A 96, 032306 (2017).
  12. J. Sperling, A. Eckstein, W. R. Clements, M. Moore, J. J. Renema, W. S. Kolthammer, S. W. Nam, A. Lita, T. Gerrits, I. A. Walmsley, G. S. Agarwal, and W. Vogel
    Identification of nonclassical properties of light with multiplexing layouts
    Phys. Rev. A 96, 013804 (2017)
  13. J. Sperling, E. Agudelo, I. A. Walmsley, and W. Vogel
    Quantum correlations in composite systems
    J. Phys. B: At. Mol. Opt. Phys. 50, 134003 (2017)
  14. F. Krumm, W. Vogel, and J. Sperling
    Time-dependent quantum correlations in phase space
    Phys. Rev. A 95, 063805 (2017)
  15. 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)
  16. S. Ryl, J. Sperling, and W. Vogel
    Quantifying nonclassicality by characteristic functions
    Phys. Rev. A 95, 053825 (2017)
  17. J. Sperling, W. R. Clements, A. Eckstein, M. Moore, J. J. Renema, W. S. Kolthammer, S. W. Nam, A. Lita, T. Gerrits, W. Vogel, G. S. Agarwal, and I. A. Walmsley
    Detector-Independent Verification of Quantum Light
    Phys. Rev. Lett. 118, 163602 (2017)
  18. B. Kühn, W. Vogel, M. Mraz, S. Köhnke, and B. Hage
    Anomalous Quantum Correlations of Squeezed Light
    Phys. Rev. Lett. 118, 153601 (2017)
  19. M. Bohmann, R. Kruse, J. Sperling, C. Silberhorn, and W. Vogel
    Direct calibration of click-counting detectors
    Phys. Rev. A 95, 033806 (2017)
  20. S. Gerke, J. Sperling, W. Vogel, Y. Cai, J. Roslund, N. Treps, and C. Fabre
    Multipartite Entanglement of a Two-Separable State
    Phys. Rev. Lett. 117, 110502 (2016).
  21. J. Sperling, T. J. Bartley, G. Donati, M. Barbieri, X.-M. Jin, A. Datta, W. Vogel, and I. A. Walmsley
    Quantum Correlations from the Conditional Statistics of Incomplete Data
    Phys. Rev. Lett. 117, 083601 (2016).
  22. J. Sperling, W. Vogel, and G. S. Agarwal
    Operational definition of quantum correlations of light
    Phys. Rev. A 94, 013833 (2016).
  23. J. Sperling
    Characterizing maximally singular phase-space distributions
    Phys. Rev. A 94, 013814 (2016).
  24. F. Krumm, J. Sperling, and W. Vogel
    Multitime correlation functions in nonclassical stochastic processes
    Phys. Rev. A 93, 063843 (2016).
  25. B. Kühn and W. Vogel
    Unbalanced Homodyne Correlation Measurements
    Phys. Rev. Lett. 116, 163603 (2016).
Period from project proposal to grant agreement
  1. 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).
  2. S. Gerke, J. Sperling, W. Vogel, Y. Cai, J. Roslund, N. Treps, and C. Fabre
    Full Multipartite Entanglement of Frequency-Comb Gaussian States
    Phys. Rev. Lett. 114, 050501 (2015).

Activities

activities within the project of partner UROS

2018
  1. October 23, Paris: QCUMbER check meeting
  2. September 10-14, Kyiv: Summer School and Conference for Young Researchers on Modern Quantum Technologies (MQT'18)
    Tutorial: W. Vogel, Measurement theory in quantum optics / Uncovering Quantum Effects of Light / Quantum Correlation Measurements
    Seminar: B. Kühn, Measurement theory in quantum optics / Uncovering Quantum Effects of Light / Quantum Correlation Measurements
  3. July 10-13, Oxford: Quantum Controlled Ultrafast Multimode Entanglement and Measurement (QCUMbER) 2018
    Tutorial: W. Vogel, Verification of quantum light
    Contributed Talk: S. Gerke, W. Vogel, and J. Sperling, Entanglement detection via numerical approaches
    Poster: B. Kühn and W. Vogel, Nonclassicality quasiprobabilities quantify nonclassicality and certify quantum non-Gaussianity
  4. April 26-28, Shanghai: International Forum for Young Scientists (Scholars) & The Third International Symposium for Young Researchers on Atomic, Molecular, and Optical Physics (ISYRAMO-III)
    Invited Talk: S. Gerke, J. Sperling, and W. Vogel, Numerical Verification of Entanglement by Witnessing Approaches
  5. March 22-23, Rostock: QCUMbER consortium meeting
  6. February 2-5, Kuala Lumpur: International Conference on Quantum and Nonlinear Optics (QNO) 2018
    Poster: S. Gerke, J. Sperling, W. Vogel, Y. Cai, J. Roslund, N. Treps, and C. Fabre, Definition and Detection of of Multimode Entanglement
    Contributed Talk: B. Kühn, W. Vogel, and J. Sperling, Displaced photon number entanglement tests
2017
  1. December 19-20, visit: Prof. Dr. Stephen Walborn, Universidade Federal do Rio de Janeiro, Brasil, Talk: "Quantum Enhanced Sensing from Hyper-Entanglement"
  2. November 23-24, Paris: QCUMbER consortium meeting
  3. November 15, visit: Prof. Kyungwon An, Seoul National University, Talk: "Single-atom superradiance"
  4. September 11-12, Paris (UPMC): Work meeting
  5. August 14-25, Paraty: VI Quantum Information School and Workshop
    Poster: S. Gerke, J. Sperling, W. Vogel, Y. Cai, J. Roslund, N. Treps, and C. Fabre, Multimode entanglement: Definition and detection
  6. May 7-13, Torino, Quantum 2017
    Poster: B. Kühn, W. Vogel, M. Mraz, S. Köhnke, and B. Hage, Anomalous quantum correlations of squeezed light
  7. March 27-31, Oxford (UOXF): Work meeting (B. Kühn)
  8. March 1-4, Rome: QCUMbER consortium meeting
2016
  1. October 23-25, Brussels: QCUMbER check meeting
  2. September 19-23, Paris (UPMC): Work meeting
  3. June 27 - July 1, Kolymbari: 23rd Central European Workshop on Quantum Optics
  4. June 22-24, Rio de Janeiro: Quantumness: A celebration of Luiz Davidovich's research career on his 70th birthday
  5. May 19-21, Sopot: Symposium KCIK 2016
  6. April 25/26, Paderborn: QCUMbER meeting
  7. April 4-6, visit: B. Smith, Oxford (UOXF)
  8. April 5, Optics Seminar: B. Smith Generation, manipulation and measurement of quantum light: Tailoring nonlinear interactions of ultrashort pulse modes at the few-photon level
  9. March 22 - April 1: J. Sperling (UROS) visits Prof. G. S. Agarwal (Oklahoma State University, Stillwater, USA)
2015
  1. November 23-25, visit: C. Fabre, Paris (UPMC)
  2. September 23/24, Oxford: Kick-off meeting