Microwave-activated conditional-phase gate for superconducting qubits

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...

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Bibliographic Details
Published in:	New journal of physics Vol. 15; no. 11; pp. 115012 - 10
Main Authors:	Chow, Jerry M, Gambetta, Jay M, Cross, Andrew W, Merkel, Seth T, Rigetti, Chad, Steffen, M
Format:	Journal Article
Language:	English
Published:	IOP Publishing 19-11-2013
Subjects:	Crosstalk Gates Joining Microwaves Qubits (quantum computing) Resonators Superconductivity Tomography
Online Access:	Get full text
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Summary:	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 ∼ 87%.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1367-2630 1367-2630
DOI:	10.1088/1367-2630/15/11/115012