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 N72: Semiconductor Qubits: Spin Qubit Measurement II
11:30 AM–2:18 PM,
Wednesday, March 8, 2023
Room: Room 406
Sponsoring
Unit:
DQI
Chair: Sophie Hermans, California Institute of Technology
Abstract: N72.00012 : Trapping single photo-carriers in undoped single-gated quantum dots using an on-chip microwave resonator for charge readout*
1:42 PM–1:54 PM
Presenter:
Pierre Lefloic
(Université de Sherbrooke)
Authors:
Pierre Lefloic
(Université de Sherbrooke)
Zhiren Wang
(Universite de Sherbrooke)
Alicia Kam
(National Research Council Canada)
Louis Gaudreau
(National Research Council Canada)
Michel Pioro-Ladrière
(Universite de Sherbrooke)
By shining an above-the-gap laser light onto an undoped GaAs substrate, we demonstrate that it is possible to create and separate electron-hole pairs to form quantum dots with one of the two polarities. By pairing this technique with a superconducting coplanar waveguide resonator for the charge readout, we achieve a working many-charge double quantum dot device with controllable interdot charge exchange. The device, comprised of only two plunger gates and one tunnel coupling gate, shows that the initialization of quantum dots does not require reservoirs, source/drain bias, ohmic contacts, or doping. Therefore, the number of gates can be reduced and the fabrication process can be simplified. Moreover, this new method can be applied to a wide range of semiconductor quantum dot systems.
Such a hybrid device is the first step towards a more scalable design for quantum dot arrays. It is also a good starting point for quantum transducing thanks to the optical–matter–microwave interaction.
*This research was partially funded by the Canada First Research Excellence Fund and the Government of Canada's Quantum Sensors Challenge program.
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