TY - JOUR
T1 - Microwave-activated controlled- Z gate for fixed-frequency fluxonium qubits
AU - Nesterov, Konstantin N.
AU - Pechenezhskiy, Ivan V.
AU - Wang, Chen
AU - Manucharyan, Vladimir E.
AU - Vavilov, Maxim G.
N1 - Funding Information:
Acknowledgments. We would like to thank Robert McDermott, Long Nguyen, Mark Saffman, and Zhenyi Qi for fruitful discussions. We acknowledge funding from the U.S. Army Research Office (Grants No. W911NF-15-1-0248 and No. W911NF-18-1-0146) and NSF PFC at JQI (Grant No. 1430094). Numerical simulations were performed using the QuTiP package [40] .
Funding Information:
We would like to thank Robert McDermott, Long Nguyen, Mark Saffman, and Zhenyi Qi for fruitful discussions. We acknowledge funding from the U.S. Army Research Office (Grants No. W911NF-15-1-0248 and No. W911NF-18-1-0146) and NSF PFC at JQI (Grant No. 1430094).
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/9/24
Y1 - 2018/9/24
N2 - 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 500MHz. 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.
AB - 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 500MHz. 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.
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U2 - 10.1103/PhysRevA.98.030301
DO - 10.1103/PhysRevA.98.030301
M3 - Article
AN - SCOPUS:85053840404
SN - 1050-2947
VL - 98
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 3
M1 - 030301
ER -