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

Joseph L. Allen, Robert Kosut, Jae Woo Joo, Peter Leek, Eran Ginossar

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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.
Original languageEnglish
Article number042325
Number of pages11
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number4
Publication statusPublished - 18 Apr 2017


  • RCUK
  • EP/L026082/1
  • EP/L02263X/1


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