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Chip-to-chip entanglement of transmon qubits using engineered measurement fields. / Dickel, C.; Wesdorp, J. J.; Langford, N. K.; Peiter, S.; Sagastizabal, R.; Bruno, A.; Criger, B.; Motzoi, F.; DiCarlo, L.

In: Physical Review B, Vol. 97, No. 6, 064508, 2018.

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@article{a2621983e7a9497a901917bf548e9250,
title = "Chip-to-chip entanglement of transmon qubits using engineered measurement fields",
abstract = "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.",
author = "C. Dickel and Wesdorp, {J. J.} and Langford, {N. K.} and S. Peiter and R. Sagastizabal and A. Bruno and B. Criger and F. Motzoi and L. DiCarlo",
year = "2018",
doi = "10.1103/PhysRevB.97.064508",
language = "English",
volume = "97",
journal = "Physical Review B",
issn = "2160-3308",
publisher = "American Physical Society",
number = "6",

}

RIS

TY - JOUR

T1 - Chip-to-chip entanglement of transmon qubits using engineered measurement fields

AU - Dickel, C.

AU - Wesdorp, J. J.

AU - Langford, N. K.

AU - Peiter, S.

AU - Sagastizabal, R.

AU - Bruno, A.

AU - Criger, B.

AU - Motzoi, F.

AU - DiCarlo, L.

PY - 2018

Y1 - 2018

N2 - 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.

AB - 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.

UR - http://resolver.tudelft.nl/uuid:a2621983-e7a9-497a-9019-17bf548e9250

UR - http://www.scopus.com/inward/record.url?scp=85042154308&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.97.064508

DO - 10.1103/PhysRevB.97.064508

M3 - Article

VL - 97

JO - Physical Review B

T2 - Physical Review B

JF - Physical Review B

SN - 2160-3308

IS - 6

M1 - 064508

ER -

ID: 45052455