Kavli Affiliate: Oskar Painter
| First 5 Authors: Gihwan Kim, Andreas Butler, Vinicius S. Ferreira, Xueyue Zhang, Alex Hadley
| Summary:
Rapid and accurate initialization of qubits, reset, is a crucial building
block for various tasks in quantum information processing, such as quantum
error-correction and estimation of statistics of noisy quantum devices with
many qubits. We demonstrate unconditional reset of a frequency-tunable transmon
qubit that simultaneously resets multiple excited states by utilizing a
metamaterial waveguide engineered to provide a cold bath over a wide spectral
range, while providing strong protection against Purcell decay of the qubit. We
report reset error below 0.13% (0.16%) when prepared in the first (second)
excited state of the transmon within 88ns. Additionally, through the sharp
roll-off in the density of states of the metamaterial waveguide, we implement a
leakage reduction unit that selectively resets the transmon’s second excited
state to 0.285(3)% residual population within 44ns while acting trivially in
the computational subspace as an identity operation that preserves encoded
information with an infidelity of 0.72(1)%.
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