Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session K41: Superconducting Qubits: Gates and Coupling
3:00 PM–6:00 PM,
Tuesday, March 15, 2022
Room: McCormick Place W-196C
Sponsoring Units: DQI DCMP
Chair: Ofer Naaman, Google, Inc.
Abstract: K41.00006 : Floating tunable coupler for scalable quantum computing architectures
4:00 PM–4:12 PM
Eyob A Sete
Eyob A Sete
Angela Q Chen
We propose a floating tunable coupler that does not rely on direct qubit-qubit coupling capacitances to achieve the zero-coupling condition. We show that the polarity of the qubit-coupler couplings can be engineered to offset the otherwise constant qubit-qubit coupling and attain the zero-coupling condition when the coupler frequency is above or below the qubit frequencies. We experimentally demonstrate these two operating regimes of the tunable coupler by implementing symmetric and asymmetric configurations of the superconducting pads of the coupler with respect to the qubits. We demonstrate parametric-resonance iSWAP and CZ gates for both operating regimes of the tunable coupler with two-qubit interleaved randomized benchmarking fidelity exceeding 99%. We show a simple and scalable calibration method for both parametric-resonance and fast DC pulse enabled iSWAP gates.
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