Optimal control of two qubits via a single cavity drive in circuit quantum electrodynamics
Abstract
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.
- Publication:
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Physical Review A
- Pub Date:
- April 2017
- DOI:
- 10.1103/PhysRevA.95.042325
- arXiv:
- arXiv:1703.06077
- Bibcode:
- 2017PhRvA..95d2325A
- Keywords:
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- Quantum Physics;
- Condensed Matter - Superconductivity
- E-Print:
- Final published version