Universal control of a six-qubit quantum processor in silicon

Abstract Future quantum computers capable of solving relevant problems will require a large number of qubits that can be operated reliably 1 . However, the requirements of having a large qubit count and operating with high fidelity are typically conflicting. Spins in semiconductor quantum dots show long-term promise 2,3 but demonstrations so far use between one and four qubits and typically optimize the fidelity of either single- or two-qubit operations, or initialization and readout 4–11 . Here, we increase the number of qubits and simultaneously achieve respectable fidelities for universal operation, state preparation and measurement. We design, fabricate and operate a six-qubit processor with a focus on…

• UD
  U.S. Department of Energy

  Awards: FG02-03ER46028, DE-FG02-, DE-FG02-03ER46028, DE-FG02
• KT
  Keysight Technologies
• AR
  Army Research Office

  Awards: W911NF-17-1-0274, W911NF, W911NF-12-1-0607
• HM
  H2020 Marie Skłodowska-Curie Actions

  Award: 676108