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 L33: Fault-Tolerance, Gates, and Leakage
8:00 AM–11:00 AM,
Wednesday, March 17, 2021
Sponsoring
Unit:
DQI
Chair: Guanyu Zhu, IBM TJ Watson Research Center
Abstract: L33.00008 : A hardware-efficient leakage-reduction scheme for a transmon-based surface code*
9:24 AM–9:36 AM
Live
Presenter:
Francesco Battistel
(QuTech, Delft University of Technology)
Authors:
Francesco Battistel
(QuTech, Delft University of Technology)
Boris Varbanov
(QuTech, Delft University of Technology)
Barbara Terhal
(QuTech and JARA Institute for Quantum Information, Delft University of Technology and Forschungszentrum Juelich)
We use a microwave pulse to transfer leakage from data-qubits to their readout resonator, where it quickly decays, without significantly affecting the coherence of the computational states. For ancilla qubits we use a |1>-|2> rotation conditioned on the measurement outcome.
First, we show the viability of these schemes using achievable experimental parameters, fitting within the QEC-cycle time. Second, via density-matrix simulations of the distance-3 surface code, we show that the average leakage lifetime is drastically shortened and that the logical fidelity is improved. This hardware-efficient scheme can be used in near-term QEC demonstrations and is scalable for large-scale QEC.
*F.B., B.V., and B.M.T. are supported by ERC grant EQEC No. 682726
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