Superconducting circuit architecture for digital-analog quantum computing

ABSTRACT

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 $\ell \times h$ fermion lattice (with $2 < \ell \leq h$), using only $2(2\ell + 1)^2 + 24$ 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.

DETAILS
  • Publication Year: 2022
  • DOI 10.1140/epjqt/s40507-022-00129-y
  • Authors Jing Yu, Juan Carlos Retamal, Mikel Sanz, Enrique Solano, Francisco Albarrán-Arriagada
  • URL EPJ Quantum Technol. 9, 9 (2022)