Long-distance transmon coupler with CZ gate fidelity above $99.8\%$
- URL: http://arxiv.org/abs/2208.09460v2
- Date: Mon, 19 Dec 2022 13:38:16 GMT
- Title: Long-distance transmon coupler with CZ gate fidelity above $99.8\%$
- Authors: Fabian Marxer, Antti Veps\"al\"ainen, Shan W. Jolin, Jani Tuorila,
Alessandro Landra, Caspar Ockeloen-Korppi, Wei Liu, Olli Ahonen, Adrian Auer,
Lucien Belzane, Ville Bergholm, Chun Fai Chan, Kok Wai Chan, Tuukka Hiltunen,
Juho Hotari, Eric Hyypp\"a, Joni Ikonen, David Janzso, Miikka Koistinen,
Janne Kotilahti, Tianyi Li, Jyrgen Luus, Miha Papic, Matti Partanen, Jukka
R\"abin\"a, Jari Rosti, Mykhailo Savytskyi, Marko Sepp\"al\"a, Vasilii
Sevriuk, Eelis Takala, Brian Tarasinski, Manish J. Thapa, Francesca Tosto,
Natalia Vorobeva, Liuqi Yu, Kuan Yen Tan, Juha Hassel, Mikko M\"ott\"onen and
Johannes Heinsoo
- Abstract summary: We demonstrate a tunable qubit-qubit coupler based on a floating transmon device.
We place qubits at least 2 mm apart from each other while maintaining over 50 MHz coupling between the coupler and the qubits.
- Score: 37.50928453361462
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Tunable coupling of superconducting qubits has been widely studied due to its
importance for isolated gate operations in scalable quantum processor
architectures. Here, we demonstrate a tunable qubit-qubit coupler based on a
floating transmon device which allows us to place qubits at least 2 mm apart
from each other while maintaining over 50 MHz coupling between the coupler and
the qubits. In the introduced tunable-coupler design, both the qubit-qubit and
the qubit-coupler couplings are mediated by two waveguides instead of relying
on direct capacitive couplings between the components, reducing the impact of
the qubit-qubit distance on the couplings. This leaves space for each qubit to
have an individual readout resonator and a Purcell filter needed for fast
high-fidelity readout. In addition, the large qubit-qubit distance reduces
unwanted non-nearest neighbor coupling and allows multiple control lines to
cross over the structure with minimal crosstalk. Using the proposed flexible
and scalable architecture, we demonstrate a controlled-$Z$ gate with $(99.81
\pm 0.02)\%$ fidelity.
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