Yishai Klein, PhD

Yishai Klein earned his Ph.D. in Physics from Bar Ilan University in 2023, specializing in X-ray imaging and spectroscopy with a focus on single-pixel detection. Under the supervision of Prof. Sharon Shwartz, he developed new detection methods using structured illumination techniques, improving X-ray imaging and spectroscopy in various sources, including laboratory sources, synchrotrons, and x-ray-free electron lasers. Notably, he demonstrated the first use of quantum interferometry with an X-ray SU (1,1) interferometer. He joined the SQO group in Ottawa as a postdoctoral researcher, moving to the optical range but still focusing on new SU (1,1) approaches and including quantum imaging and super-resolution projects.


  1. Yehuda, A. B., Sefi, O., Klein, Y., Shukrun, R. H., Schwartz, H., Cohen, E., & Shwartz, S. (2023). High-resolution computed tomography with scattered x-ray radiation and a single pixel detector. arXiv preprint arXiv:2305.12468.
  2. Manni, M., Ben-Yehuda, A., Klein, Y., Lukic, B., Kingston, A., Rack, A., Shwartz, S & Viganò, N. (2023). Synchrotron-based x ray fluorescence ghost imaging. Optics Letters, 48(23), 6271-6274.
  3. De Angelis D., Principi E., Bencivenga F., Fausti D., Foglia L., Klein Y., Manfredda M., Mincigrucci R., Montanaro A., Pedersoli E., Stefano J., Cresi P., Perosa G., Prince K.C., Razzoli E., Shwartz S., Simoncig A., Spampinati S., Svetina C., Szlachetko J., Tripathi A., Vartanyants I.A., Zangrando M., & Capotondi F. (2023) “FEL stochastic spectroscopy showcasing silicon bond softening dynamics” Phys. Rev. B 107 (21), 214305
  4. Klein Y., Tripathi A.K., Strizhevsky E., Capotondi F., De Angelis D., Giannessi L., Pancaldi M., Pedersoli E., Prince K., Sefi O. Kim Y., Vartanyants I. & Shwartz S. (2023) “High-spectral resolution absorption measurements with free-electron lasers using ghost spectroscopy”, Phys. Rev. A, 107(5), 053503.
  5. Klein Y., Sefi O., Schwartz H., & Shwartz S. (2022) “Chemical element mapping by x-ray ghost fluorescence”, Optica 9(1), 63-70.
  6. O, Klein Y., Strizhevsky E., Dolbnya I. P., & Shwartz S. (2020) “High-speed x-ray imaging with single-pixel detector”, Opt. Express, 28(17) 24568-24576
  7. Klein Y., Schori A., Dolbnya I. P., Sawhney K., & Shwartz S. (2019) “X-ray computational ghost imaging with a single-pixel detector”, Opt. Express, 27(3), 3284-3293.