Fast logic with slow qubits: microwave-activated controlled-Z gate on low-frequency fluxoniums
| Autor: | Aaron Somoroff, Konstantin Nesterov, Maxim Vavilov, Long Nguyen, Haonan Xiong, Quentin Ficheux, Vladimir Manucharyan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
QC1-999
FOS: Physical sciences General Physics and Astronomy Low frequency 01 natural sciences Quantum logic 010305 fluids & plasmas Superconductivity (cond-mat.supr-con) Computer Science::Hardware Architecture Computer Science::Emerging Technologies Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Hardware_ARITHMETICANDLOGICSTRUCTURES 010306 general physics Quantum Physics Quantum Physics Condensed Matter - Mesoscale and Nanoscale Physics business.industry Condensed Matter - Superconductivity TheoryofComputation_GENERAL ComputerSystemsOrganization_MISCELLANEOUS Qubit Scalability Optoelectronics Quantum Physics (quant-ph) business Microwave Hardware_LOGICDESIGN |
| Zdroj: | Physical Review X, Vol 11, Iss 2, p 021026 (2021) |
| Popis: | We demonstrate a controlled-Z gate between capacitively coupled fluxonium qubits with transition frequencies $72.3~\textrm{MHz}$ and $136.3~\textrm{MHz}$. The gate is activated by a $61.6~\textrm{ns}$ long pulse at the frequency between non-computational transitions $|10\rangle - |20\rangle$ and $|11\rangle - |21\rangle$, during which the qubits complete only $4$ and $8$ Larmor periods, respectively. The measured gate error of $(8\pm1)\times 10^{-3}$ is limited by decoherence in the non-computational subspace, which will likely improve in the next generation devices. Although our qubits are about fifty times slower than transmons, the two-qubit gate is faster than microwave-activated gates on transmons, and the gate error is on par with the lowest reported. Architectural advantages of low-frequency fluxoniums include long qubit coherence time, weak hybridization in the computational subspace, suppressed residual $ZZ$-coupling rate (here $46~\mathrm{kHz}$), and absence of either excessive parameter matching or complex pulse shaping requirements. |
| Databáze: | OpenAIRE |
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