An essential aspect of a quantum channel is the detection and analysis of quantum signals in the form of photons. For most free-space applications, the photons are polarization encoded, e.g. by assigning the ‘0’ to horizontally polarized photons and ‘1’ to vertically polarized photons. However, where the geometric reference is not constant at all times – such as links to hand-held devices or aircraft – polarization encoding leads to increased error. For these situations, time-bin encoding offers a promising robust solution. In this approach, time photon represents ‘0’ or ‘1’ depending on its detection in one of two time windows. Just like in the case of polarization encoding, where a photon can be in a superposition of vertical and horizontal polarization, a time-bin encoded photon can be in a superposition of being in the first and the second time window. Additionaly, quantum signals can be relatively easily converted between being polarization and time-bin encoded.
In this project, we jointly develop a quantum receiver with short time delay and high timing resolution that is optimized to handle time-bin encoded quantum signals. By combining our team’s expertise in free-space quantum receivers with a new detector array technology developed by Dr. Serge Charlebois and Jean-Francois Pratte of the University of Sherbrooke and by introducing new capabilities for integrated free-space time-bin encoding with high timing resolution detection, we expect to achieve state-of-the-art performance for quantum signal receiver technology. Such high-speed devices will open new doors for a variety of applications including daylight and continuous variable quantum key distribution, quantum sensing, imaging and LIDAR, and fundamental science tests.
Rydberg Atom Array Quantum Simulator
Summary Quantum simulators enable probing the static and dynamic properties of correlated quantum many-body systems that would otherwise be numerically inaccessible using classical simulators. We are developing quantum simulators based on arrays of neutral atoms excited to Rydberg states. Such Rydberg atom arrays are advantageous for simulating the dynamics of interacting spin systems (Ising spin […]
February 27, 2020
Quantum Sensing with Small Quantum Systems
Summary There are small quantum systems over which we have very good control and which have long lifetimes. Examples include the phosphorous (P) defect in silicon (Si) and the nitrogen vacancy (NV) defect in diamond. With P defect in Si, we focus on improving our understanding of the hyperpolarization mechanism to better enable engineering of […]
December 1, 2016
Quantum Material Multilayer Photonic Devices and Network
Summary Realizing highly integrated quantum photonic devices on a chip can enable new opportunities for photonic quantum computation. In this project, we explore heterostructures of stacked two-dimensional (2D) materials, such transition metal dichalcogenides (TMDC) or graphene, combined with optical microcavities as a platform for such devices. 2D materials are extremely thin and flexible, and have […]
December 12, 2019