Postdoctoral fellow

Guillaume Thekkadath





Guillaume Thekkadath joined the group as a postdoctoral fellow in September 2021. He completed his PhD at the University of Oxford in 2020. His expertise is in photon pair sources and photon-number-resolving detectors. In his spare time, he enjoys rock climbing and slapping his bass.


  1. G. Thekkadath, D. England, B. Sussman “Intensity correlation holography for remote phase sensing and 3D imaging,” Optics Express 31, 43574 (2023).
  2. G. S. Thekkadath, D. England, F. Bouchard, Y. Zhang, M. S. Kim, B. Sussman “Intensity interferometry for holography with quantum and classical light,” Science Advances 9, eadh1439 (2023).
  3. A. Z. Goldberg, G. S. Thekkadath, K. Heshami “Measuring the quadrature coherence scale on a cloud quantum computer,” Physical Review A 107, 042610 (2023).
  4. G. S. Thekkadath, S. Sempere-Llagostera, B. A. Bell, R. B. Patel, M. S. Kim, I. A. Walmsley “Experimental demonstration of Gaussian boson sampling with displacement,” PRX Quantum 3, 020336 (2022).
  5. S. Sempere-Llagostera, G. S. Thekkadath, R. B. Patel, W. S. Kolthammer, I. A. Walmsley “Reducing g(2)(0) of a parametric down-conversion source via photon-number resolution with superconducting nanowire detectors,” Optics Express 30, 3138 (2022).
  6. G. S. Thekkadath, B. A. Bell, R. B. Patel, M. S. Kim, I. A. Walmsley “Measuring the joint spectral mode of photon pairs using intensity interferometry,” Physical Review Letters 128, 023601 (2022).
  7. G. S. Thekkadath, S. Sempere-Llagostera, B. A. Bell, R. B. Patel, M. S. Kim, I. A. Walmsley “Single-shot discrimination of coherent states beyond the standard quantum limit,” Optics Letters 46, 2565 (2021).
  8. G. S. Thekkadath, M. E. Mycroft, B. A. Bell, C. G. Wade, A. Eckstein, D. S. Phillips, R. B. Patel, A. Buraczewski, A. E. Lita, T. Gerrits, S. Nam, M. Stobińska, A. I. Lvovsky, I. A. Walmsley “Quantum-enhanced interferometry with large heralded photon-number states,” NPJ Quantum Information 6, 1 (2020).
  9. G. S. Thekkadath, D. S. Phillips, J. F. F. Bulmer, W. R. Clements, A. Eckstein, B. A. Bell, J. Lugani, T. A. W. Wolterink, A. Lita, S. W. Nam, T. Gerrits, C. G. Wade, I. A. Walmsley “Tuning between photon-number and quadrature measurements with weak-field homodyne detection,” Physical Review A 101, 031801 (2020).
  10. G. S. Thekkadath, B. A. Bell, I. A. Walmsley, A. I. Lvovsky “Engineering Schrödinger cat states with a photonic even-parity detector,” Quantum 4, 239 (2020).
  11. J. Sperling, D. S. Phillips, J. F. F. Bulmer, G. S. Thekkadath, A. Eckstein, T. A. W. Wolterink, J. Lugani, S. W. Nam, A. Lita, T. Gerrits, W. Vogel, G. S. Agarwal, C. Silberhorn, I. A. Walmsley “Detector-agnostic phase-space distributions,” Physical Review Letters 124, 013605 (2020).
  12. B. A. Bell, G. S. Thekkadath, R. Ge, X. Cai, I. A. Walmsley “Testing multi-photon interference on a silicon chip,” Optics Express 27, 35646 (2019).
  13. G. S. Thekkadath, F. Hufnagel, J. S. Lundeen “Determining complementary properties using weak-measurement: uncertainty, predictability, and disturbance,” New Journal of Physics 20, 113034 (2018).
  14. G. S. Thekkadath, L. Giner, X. Ma, J. Flórez, J. S. Lundeen “Projecting onto any two-photon polarization state using linear optics,” New Journal of Physics 20, 083033 (2018).
  15. D. Curic, M. C. Richardson, G. S. Thekkadath, J. Flórez, L. Giner, J. S. Lundeen “Experimental investigation of measurement-induced disturbance and time symmetry in quantum physics,” Physical Review A 97, 042128 (2018).
  16. K. T. Kaczmarek, P. M. Ledingham, B. Brecht, S. E. Thomas, G. S. Thekkadath, O. Lazo-Arjona, J. H. D. Munns, E. Poem, A. Feizpour, D. J. Saunders, J. Nunn, I. A. Walmsley “High-speed noise-free optical quantum memory,” Physical Review A 97, 042316 (2018).
  17. A. F. Alharbi, A. E. Boguslavskiy, N. Thiré, G. S. Thekkadath, S. Patchkovskii, B. E. Schmidt, F. Légaré, T. Brabec, V. R. Bhardwaj, M. Spanner “Effects of nodal planes on strong-field ionization and high-order-harmonic generation in ring-type molecules,” Physical Review A 96, 043402 (2017).
  18. G. S. Thekkadath, R. Y. Saaltink, L. Giner, J. S. Lundeen “Determining complementary properties with quantum clones,” Physical Review Letters 119, 050405 (2017).
  19. G. S. Thekkadath, K. Heshami, D. G. England, P. J. Bustard, B. J. Sussman, M. Spanner “Optical quantum memory for ultrafast photons using molecular alignment,” Journal of Modern Optics 63, 2093 (2016).
  20. G. S. Thekkadath, L. Jiang, J. H. Thywissen “Spin correlations and entanglement in partially magnetised ensembles of fermions,” Journal of Physics B: Atomic, Molecular and Optical Physics 49, 214002 (2016).
  21. G. S. Thekkadath, L. Giner, Y. Chalich, M. J. Horton, J. Banker, J. S. Lundeen “Direct measurement of the density matrix of a quantum system,” Physical Review Letters 117, 120401 (2016).
  22. G. S. Thekkadath, M. Spanner “Comment on Human Time-Frequency Acuity Beats the Fourier Uncertainty Principle,” Physical Review Letters 114, 069401 (2015).