Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session M74: Spin Qubit Measurement I
8:00 AM–10:48 AM,
Wednesday, March 8, 2023
Room: Room 403/404
Sponsoring
Unit:
DQI
Chair: Nathan Holman, HRL Laboratories, LLC
Abstract: M74.00008 : Universal qubit control through FPGA-accelerated qubit classification, Hamiltonian estimation and real-time feedback [Part 2]*
9:48 AM–10:00 AM
Presenter:
Fabrizio Berritta
(Niels Bohr Institute, University of Copenhagen)
Authors:
Fabrizio Berritta
(Niels Bohr Institute, University of Copenhagen)
Torbjørn R Rasmussen
(Niels Bohr Institute, University of Copenhagen)
Joost van der Heijden
(Quantum Machines, QDevil)
Federico Fedele
(Niels Bohr Institute, University of Copenhagen)
Jan A Krzywda
(Polish Academy of Sciences)
Saeed Fallahi
(Purdue University)
Geoff C Gardner
(Purdue University)
Michael J Manfra
(Purdue University)
Evert Van Nieuwenburg
(Niels Bohr Institute, University of Copenhagen)
Jeroen Danon
(Norwegian University of Science and Technology)
Anasua Chatterjee
(Niels Bohr Institute, University of Copenhagen)
Ferdinand Kuemmeth
(Niels Bohr Institute, University of Copenhagen. Quantum Machines, QDevil)
Here, we use a singlet-triplet qubit implemented in a gallium arsenide double dot and FPGA-based single-shot readout classification on an OPX+ pulse processor (Quantum Machines [4]) to perform real-time Hamiltonian estimation [5]. The fluctuating Overhauser gradient within the double dot is estimated on-the-fly, based on single-shot classifications of separated singlet pairs, enabling coherent spin rotations of the electron pair. Together with exchange rotations, this method yields universal qubit control of a GaAs spin qubit without requiring a micromagnet or nuclear polarization protocols.
[1] A.M.J. Zwerver et al., Nat. Electron. 5, 184-190 (2022)
[2] S.G.J. Philips et al., Nature 609, 919-924 (2022)
[3] A. Noiri et al., Nature 601, 338–342 (2022)
[4] https://www.quantum-machines.co/opx+/
[5] M. Shulman et al., Nat. Comm., 5(1), 5156 (2014)
*This project was funded within the QuantERA II Programme that has received funding from the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No 101017733.
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