Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session S47: Superconducting Bosonic Qubits
8:00 AM–11:00 AM,
Thursday, March 7, 2024
Room: 200CD
Sponsoring
Unit:
DQI
Chair: Benjamin D'Anjou, Univ Ulm
Abstract: S47.00010 : Dual-rail encoding in a fixed-frequency multimode transmon qubit with ancilla-free erasure error-detection
10:12 AM–10:24 AM
Presenter:
James F Wills
(Oxford Quantum Circuits)
Authors:
James F Wills
(Oxford Quantum Circuits)
Gioele Consani
(Oxford Quantum Circuits)
Brian Vlastakis
(Oxford Quantum Circuits)
OQC Hardware Team
(Oxford Quantum Circuits)
Here we present a dual-rail encoding within a single fixed-frequency superconducting multimode transmon qubit. The three island, two junction device comprises two strongly coupled transmonlike modes with a detuning of 1.5 GHz. We perform all-microwave control of the logical states using a single capacitively coupled coaxial control line. A resonator on the opposing side of the substrate allows for the dispersive readout of the multimode state of the device, with an error-detected logical state assignment fidelity of above 99%. In addition, we are able to perform a weak error-detection measurement using the same resonator with minimal dephasing of the logical state, enabling mid-circuit error detection operations. Finally, we report logical coherence metrics, and discuss its relationship to noise and decoherence in transmon qubits.
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