Scalable Quantum Circuit and Control for a Superconducting Surface Code
Richard Versluis (TU Delft - BUS/General, TU Delft - QuTech Advanced Research Centre, TNO)
Stefano Poletto (TU Delft - QuTech Advanced Research Centre, TU Delft - QN/Kavli Nanolab Delft, Kavli institute of nanoscience Delft, TU Delft - QCD/DiCarlo Lab)
Nader Khammassi (TU Delft - FTQC/Bertels Lab)
Brian Tarasinski (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/DiCarlo Lab)
Nadia Haider (TU Delft - BUS/General, TU Delft - QuTech Advanced Research Centre, TNO)
Dave Michalak (Intel Corporation)
Alessandro Bruno (TU Delft - QCD/DiCarlo Lab, TU Delft - QuTech Advanced Research Centre, TU Delft - QN/Quantum Transport, Kavli institute of nanoscience Delft)
Koen Bertels (Kavli institute of nanoscience Delft, TU Delft - FTQC/Bertels Lab, TU Delft - Quantum & Computer Engineering)
L. DiCarlo (TU Delft - QN/DiCarlo Lab, TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/DiCarlo Lab, Kavli institute of nanoscience Delft)
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Abstract
We present a scalable scheme for executing the error-correction cycle of a monolithic surface-code fabric composed of fast-flux-tunable transmon qubits with nearest-neighbor coupling. An eight-qubit unit cell forms the basis for repeating both the quantum hardware and coherent control, enabling spatial multiplexing. This control uses three fixed frequencies for all single-qubit gates and a unique frequency-detuning pattern for each qubit in the cell. By pipelining the interaction and readout steps of ancilla-based X- and Z-type stabilizer measurements, we can engineer detuning patterns that avoid all second-order transmon-transmon interactions except those exploited in controlled-phase gates, regardless of fabric size. Our scheme is applicable to defect-based and planar logical qubits, including lattice surgery.