Session Overview |
Thursday, May 30 |
08:00 |
Hyperfine characterization of T centres in silicon and memory qubit protection scheme
* Mehdi Keshavarz, Simon Fraser University, Canada Nicholas Brunelle, Simon Fraser University, Canada Joshua Kanaganayagam, Simon Fraser University, Canada Chloe Clear, Simon Fraser University, Canada Myles Ruether, Simon Fraser University, Canada Adam DeAbreu, Simon Fraser University, Canada Amirhossein AlizadehKhaledi, Simon Fraser University, Canada Nikolay Abrosimov, Leibniz-Institut für Kristallzüchtung, Germany Ian Kennedy, Simon Fraser University, Canada Melanie Gascoine, Simon Fraser University, Canada Yehudah Ackermann, Simon Fraser University, Canada Michael L. W. Thewalt, Simon Fraser University, Canada Daniel B. Higginbottom, Simon Fraser University, Canada Stephanie Simmons, Simon Fraser University, Canada The T centre is a spin-photon interface native to silicon with optical emission in the low-loss telecommunications O-band and can be integrated with the mature silicon nanophotonic and nanoelectronic technologies. As a result, it is being developed as a commercial quantum computing platform based on networked entanglement distribution. The T center consists of two non-equivalent carbon atoms, one hydrogen atom, and one electron. In this work, we measure and characterize, for the first time, all the possible hyperfine interactions between the communication qubit (electron spin) and the intrinsic memory qubits (nuclear spins). This enables us to propose a method for preventing the decoherence of the hydrogen nuclear spin as a memory qubit, establishing the possibility of brokered entanglement distribution with T centres. Moreover, through similar measurement and hyperfine characterization of two other isotopic variants of the T centre containing nuclear spins of carbon-13 atoms, we show that the deterministically coupled spin register of a T center can be as large as four qubits. This enables us to investigate the existence of clock transitions and decoherence-free subspaces to achieve longer coherence times. |
08:15 |
Magnetometry with Broadband Microwave Fields in Nitrogen-Vacancy centers in Diamond
* Arezoo Afshar, National Research Council Canada and University of Ottawa, Canada Aaron Goldberg, National Research Council Canada and University of Ottawa, Canada Khabat Heshami, National Research Council Canada and University of Calgary, Canada In this study, we introduce a method for measuring a magnetic field applied to nitrogen-vacancy centers in diamond. Our approach involves the application of a broadband microwave field across the sample, followed by the capture of the output field in the time domain using a fast detector. Subsequently, we employ the Kullback-Leibler divergence to accurately determine the magnitude of the applied magnetic field. This method aims to measure the magnetic field in a shorter time compared to conventional methods. |
08:30 |
Superresolution in time and frequency
* Luis Sanchez-Soto, Universidad Complutense, Spain Precise measurement of time delays is fundamental to numerous contemporary technologies. Here, I will discuss new methods bases on projections on temporal modes, which attain quantum-level accuracy in simultaneously estimating the temporal centroid, time offset, and relative intensities of incoherent mixtures of ultrashort pulses at the single-photon level. These advancements surpass conventional methods reliant on intensity detection by more than tenfold. |
08:55 |
TBC
* Ebrahim Karimi, University of Ottawa, Canada TBC |