Optimal control of two qubits via a single cavity drive in circuit quantum electrodynamics

Journal article

Optimization of the fidelity of control operations is of critical importance in the pursuit of fault-tolerant quantum computation. We apply optimal control techniques to demonstrate that a single drive via the cavity in circuit quantum electrodynamics can implement a high-fidelity two-qubit all-microwave gate that directly entangles the qubits via the mutual qubit-cavity couplings. This is performed by driving at one of the qubits' frequencies which generates a conditional two-qubit gate, but will also generate other spurious interactions. These optimal control techniques are used to find pulse shapes that can perform this two-qubit gate with high fidelity, robust against errors in the system parameters. The simulations were all performed using experimentally relevant parameters and constraints.

Authors: Allen, J; Kosut, R; Joo, J; Leek, P; Ginossar, E

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Physical Society
• Journal: Physical Review A
• Volume: 95
• Issue: 4
• Article number: 042325
• Publication date: 2017-04-18
• Acceptance date: 2017-03-23
• DOI: 10.1103/PhysRevA.95.042325
• EISSN: 2469-9934
• ISSN: 2469-9926