Chip-to-chip entanglement of transmon qubits using engineered measurement fields

Dickel, C; Wesdorp, JJ; Langford, NK; Peiter, S; Sagastizabal, R; Bruno, A; Criger, B; Motzoi, F; DiCarlo, L

Chip-to-chip entanglement of transmon qubits using engineered measurement fields

Dickel, C Wesdorp, JJ Langford, NK

Peiter, S Sagastizabal, R Bruno, A Criger, B Motzoi, F DiCarlo, L

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Publication Type:: Journal Article
Citation:: Physical Review B, 2018, 97 (6)
Issue Date:: 2018-02-13

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Field	Value	Language
dc.contributor.author	Dickel, C	en_US
dc.contributor.author	Wesdorp, JJ	en_US
dc.contributor.author	Langford, NK https://orcid.org/0000-0003-4338-3059	en_US
dc.contributor.author	Peiter, S	en_US
dc.contributor.author	Sagastizabal, R	en_US
dc.contributor.author	Bruno, A	en_US
dc.contributor.author	Criger, B	en_US
dc.contributor.author	Motzoi, F	en_US
dc.contributor.author	DiCarlo, L	en_US
dc.date.issued	2018-02-13	en_US
dc.identifier.citation	Physical Review B, 2018, 97 (6)	en_US
dc.identifier.issn	2469-9950	en_US
dc.identifier.uri	http://hdl.handle.net/10453/128404
dc.description.abstract	© 2018 American Physical Society. While the on-chip processing power in circuit QED devices is growing rapidly, an open challenge is to establish high-fidelity quantum links between qubits on different chips. Here, we show entanglement between transmon qubits on different cQED chips with 49% concurrence and 73% Bell-state fidelity. We engineer a half-parity measurement by successively reflecting a coherent microwave field off two nearly identical transmon-resonator systems. By ensuring the measured output field does not distinguish \|01) from \|10), unentangled superposition states are probabilistically projected onto entangled states in the odd-parity subspace. We use in situ tunability and an additional weakly coupled driving field on the second resonator to overcome imperfect matching due to fabrication variations. To demonstrate the flexibility of this approach, we also produce an even-parity entangled state of similar quality, by engineering the matching of outputs for the \|00) and \|11) states. The protocol is characterized over a range of measurement strengths using quantum state tomography showing good agreement with a comprehensive theoretical model.	en_US
dc.relation.ispartof	Physical Review B	en_US
dc.relation.isbasedon	10.1103/PhysRevB.97.064508	en_US
dc.title	Chip-to-chip entanglement of transmon qubits using engineered measurement fields	en_US
dc.type	Journal Article
utslib.citation.volume	6	en_US
utslib.citation.volume	97	en_US
utslib.for	0915 Interdisciplinary Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - QSI - Centre for Quantum Software and Information
utslib.copyright.status	open_access
pubs.issue	6	en_US
pubs.publication-status	Published	en_US
pubs.volume	97	en_US

Abstract:

© 2018 American Physical Society. While the on-chip processing power in circuit QED devices is growing rapidly, an open challenge is to establish high-fidelity quantum links between qubits on different chips. Here, we show entanglement between transmon qubits on different cQED chips with 49% concurrence and 73% Bell-state fidelity. We engineer a half-parity measurement by successively reflecting a coherent microwave field off two nearly identical transmon-resonator systems. By ensuring the measured output field does not distinguish |01) from |10), unentangled superposition states are probabilistically projected onto entangled states in the odd-parity subspace. We use in situ tunability and an additional weakly coupled driving field on the second resonator to overcome imperfect matching due to fabrication variations. To demonstrate the flexibility of this approach, we also produce an even-parity entangled state of similar quality, by engineering the matching of outputs for the |00) and |11) states. The protocol is characterized over a range of measurement strengths using quantum state tomography showing good agreement with a comprehensive theoretical model.

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http://hdl.handle.net/10453/128404