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Quantum Technologies

Canada is well positioned to become a world leader in studies of quantum phenomena and developing technologies based on quantum effects. Our research group has a major effort in exploring quantum effects both as a matter of pure science and as a means of developing quantum-enabled applications. During the past year we made significant progress towards these goals. We have performed a careful theoretical study of the limits imposed by quantum effects on the accuracy of measurements in ellipsometry [1]. We have also performed a laboratory investigation on the ability to perform nonlocal aberration correction through use of entangled photons [2]. In the study of fundamental aspects of quantum optics, we have explored a variation of the well-known Einstein-Podolsky-Rosen effect for photons entangled in radial position and radial momentum, a degree of freedom not previously studied [3]. We also performed an experiment in which we were able to make a quantum-limited estimation of the axial separation of two incoherent point sources [4].

  1. Fundamental quantum limits in ellipsometry,Ł. Rudnicki, L. L. Sánchez-Soto, G. Leuchs, and R. W. Boyd, Optics Letters 45, 4607-4610 (2020).
  2. Quantum Nonlocal Aberration Cancellation, A. N. Black, E. Giese, B. Braverman, N. Zollo, S. M. Barnett, and R. W. Boyd, Phys. Rev. Lett. 123, 143603 (2019).
  3. Realization of the Einstein-Podolsky-Rosen Paradox Using Radial Position and Radial Momentum Variables, L. Chen, T. Ma, X. Qiu, D. Zhang, W. Zhang, and R. W. Boyd, Phys. Rev. Lett. 123, 060403 (2019).
  4. Quantum-limited estimation of the axial separation of two incoherent point sources, Y. Zhou, J. Yang, J. D. Hassett, S. M. H. Rafsanjani, M. Mirhosseini, A. N. Vamivakas, A. N. Jordan, Z. Shi, and R. W. Boyd, Optica 6, 534-541 (2019).