Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session F29: Semiconductor Qubits - Spin Qubit Read-out II
11:30 AM–2:30 PM,
Tuesday, March 16, 2021
Sponsoring
Unit:
DQI
Chair: Edward Chen, IBM Research - Almaden
Abstract: F29.00003 : Adiabatic conversion for qubit readout: Optimal pulse shapes and dephasing*
12:18 PM–12:30 PM
Live
Presenter:
Felix Fehse
(Physics, McGill University, Montreal, Canada)
Authors:
Felix Fehse
(Physics, McGill University, Montreal, Canada)
Michel Pioro-Ladriere
(Physics, Université de Sherbrooke, Sherbrooke, Canada)
Bill Coish
(Physics, McGill University, Montreal, Canada)
measure quantum states. These schemes may include, e.g., spin-to-charge
conversion for spins in quantum dots or parity-to-charge conversion for qubits
based on Majorana zero modes. In all of these schemes, a common element
is that dephasing is minimized at an "operating point" (e.g., for the 'spin' or
'parity' quantum number), but measurement-induced dephasing is maximized
at the "measurement point". The balance between 'adiabaticity' and
dephasing can be optimized to improve performance of these readout
schemes. We give an explicit construction that allows for optimal state
conversion in qubit readouts. Applying this scheme to the specific case of
spin qubits in quantum dots, we show that a high-fidelity (better than 99.9%)
single-shot all-electrical readout is possible.
*INTRIQ, FRQNT, NSERC
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