Fast and Efficient All-Microwave Reset of a Transmon-Qutrit Coupled to a Large Bandwidth Resonator
ORAL
Abstract
Fast and efficient reset of qubits is a key operation in many quantum algorithms, and particularly in error correction codes. We experimentally demonstrate a reset scheme of a qutrit coupled to a low Q resonator. The reset protocol uses the microwave induced interaction between the |f,0〉 and |g,1〉 states of the system, with |g〉 and |f〉 denoting the ground and second excited state of the qutrit, and |0〉 and |1〉 the photon Fock states of the resonator. We characterize the reset process and demonstrate reinitialization of the transmon-resonator system to its ground state with 99.8% fidelity in less than 500 ns. Our protocol is of practical interest as it has no requirements on the chip design, in addition to those for fast and efficient single-shot readout of the transmon [1], and does not require any feedback for initialization.
[1] T. Walter et al., Phys. Rev. Applied 7, 054020
[1] T. Walter et al., Phys. Rev. Applied 7, 054020
*This work is supported by the European Research Coucil (ERC) through the "Superconducting Quantum Networks" (SuperQuNet) project, by the National Centre of Competence in Research "Quantum Science and Technology" (NCCR QSIT), a research intrument of the Swiss National Science Foundation (SNSF), and by ETH
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Presenters
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Paul Magnard
- Department of Physics, ETH Zürich