Microwave-Activated Conditional-Phase Gate for Superconducting Qubits
Journal Article - Open Access
IBM T J Watson Research Center Yorktown Heights United States
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We introduce a new entangling gate between two fixed-frequency qubits statically coupled via a microwave resonator bus which combines the following desirable qualities all-microwave control, appreciable qubit separation for reduction of crosstalk and leakage errors and the ability to function as a two-qubit conditional-phase gate. A fixed, always-on interaction is explicitly designed between higher energy non-computational states of two transmon qubits, and then a conditional-phase gate is activated on the otherwise unperturbed qubit subspace via a microwave drive. We implement this microwave-activated conditional-phase gate with a fidelity from quantum process tomography of approx. 87.
- Quantum Theory and Relativity