Kavli Affiliate: Irfan Siddiqi
| First 5 Authors: Long B. Nguyen, Gerwin Koolstra, Yosep Kim, Alexis Morvan, Trevor Chistolini
| Summary:
The technological development of hardware heading toward universal
fault-tolerant quantum computation requires a large-scale processing unit with
high performance. While fluxonium qubits are promising with high coherence and
large anharmonicity, their scalability has not been systematically explored. In
this work, we propose a superconducting quantum information processor based on
compact high-coherence fluxoniums with suppressed crosstalk, reduced design
complexity, improved operational efficiency, high-fidelity gates, and
resistance to parameter fluctuations. In this architecture, the qubits are
readout dispersively using individual resonators connected to a common bus and
manipulated via combined on-chip RF and DC control lines, both of which can be
designed to have low crosstalk. A multi-path coupling approach enables exchange
interactions between the high-coherence computational states and at the same
time suppresses the spurious static ZZ rate, leading to fast and high-fidelity
entangling gates. We numerically investigate the cross resonance controlled-NOT
and the differential AC-Stark controlled-Z operations, revealing low gate error
for qubit-qubit detuning bandwidth of up to 1 GHz. Our study on frequency
crowding indicates high fabrication yield for quantum processors consisting of
over thousands of qubits. In addition, we estimate low resource overhead to
suppress logical error rate using the XZZX surface code. These results promise
a scalable quantum architecture with high performance for the pursuit of
universal quantum computation.
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