Coupler-mediated unconditional reset of fixed-frequency superconducting qubits
ORAL
Abstract
As coherence times of superconducting qubits increase, a method for fast and reliable reset is needed to achieve high repetition rates. Moreover, for mid-circuit readout and error correcting schemes high fidelity active qubit reset is required. Here, we present an unconditional reset protocol for fixed frequency qubits in a flux tunable multi-qubit coupler architecture. Our reset protocol is based on a single parametric flux pulse, transferring the qubit excitation coherently to a cold and rapidly decaying transmission-line resonator, which is directly coupled to a 50 Ω environment. After the reset pulse with a typical duration of 400 ns the remaining excited state population is reduced to 0.5%, decreasing the effective qubit temperature from ≈50 mK to ≈35 mK. This multi-qubit coupler based reset method may be extended to realize the simultaneous reset of multiple qubits using a single parametric flux pulse.
*This project has received support by: the BMBF program No 13N15680 (GeQCoS), the European Union agreemt No 828826 (FET-Open Quromorphic) and is part of the Munich Quantum Valley (MQV), which is supported by the Bavarian state government with funds from the Hightech Agenda Bayern Plus.
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Publication: This submission is planned for publication.
Presenters
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Gerhard B Huber
- TU Munich & Walther-Meissner-Institute
- TU Munich & Walther-Meißner-Institut