https://doi.org/10.1140/epjqt/s40507-022-00129-y
Research
Superconducting circuit architecture for digital-analog quantum computing
1
International Center of Quantum Artificial Intelligence for Science and Technology (QuArtist) and Physics Department, Shanghai University, 200444, Shanghai, China
2
Departamento de Física, Universidad de Santiago de Chile (USACH), Avenida Víctor Jara 3493, 9170124, Santiago, Chile
3
Center for the Development of Nanoscience and Nanotechnology, 9170124, Estación Central, Santiago, Chile
4
Department of Physical Chemistry, University of the Basque Country UPV/EHU, Apartado 644, 48080, Bilbao, Spain
5
IKERBASQUE, Basque Foundation for Science, Plaza Euskadi 5, 48009, Bilbao, Spain
6
Kipu Quantum, Kurwenalstrasse 1, 80804, Munich, Germany
d
enr.solano@gmail.com
e
pancho.albarran@gmail.com
Received:
4
August
2021
Accepted:
16
March
2022
Published online:
6
April
2022
We propose a superconducting circuit architecture suitable for digital-analog quantum computing (DAQC) based on an enhanced NISQ family of nearest-neighbor interactions. DAQC makes a smart use of digital steps (single qubit rotations) and analog blocks (parametrized multiqubit operations) to outperform digital quantum computing algorithms. Our design comprises a chain of superconducting charge qubits coupled by superconducting quantum interference devices (SQUIDs). Using magnetic flux control, we can activate/deactivate exchange interactions, double excitation/de-excitations, and others. As a paradigmatic example, we present an efficient simulation of an 
fermion lattice (with 
), using only 
analog blocks. The proposed architecture design is feasible in current experimental setups for quantum computing with superconducting circuits, opening the door to useful quantum advantage with fewer resources.
© The Author(s) 2022
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