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Microwave-Activated Controlled-Z Gate for Fixed-Frequency Fluxonium Qubits | | Konstantin N. Nesterov
; Ivan V. Pechenezhskiy
; Chen Wang
; Vladimir E. Manucharyan
; Maxim G. Vavilov
; | | Date: |
9 Feb 2018 | | Abstract: | The superconducting fluxonium circuit is an artificial atom with a strongly
anharmonic spectrum: when biased at a half flux quantum, the lowest qubit
transition is an order of magnitude smaller in frequency than those to higher
levels. Similar to conventional atomic systems, such a frequency separation
between the computational and noncomputational subspaces allows independent
optimizations of the qubit coherence and two-qubit interactions. Here we
describe a controlled-Z gate for two fluxoniums connected either capacitively
or inductively, with qubit transitions fixed near 500 MHz. The gate is
activated by a microwave drive at a resonance involving the second excited
state. We estimate intrinsic gate fidelities over 99.9% with gate times below
100 ns. | | Source: | arXiv, 1802.3095 | | Services: | Forum | Review | PDF | Favorites | |
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