Demonstrating a Continuous Set of Two-qubit Gates for Near-term Quantum Algorithms

被引：192

作者：

Foxen, B. ^{[1
,2
]}

Neill, C. ^{[2
]}

Dunsworth, A. ^{[2
]}

Roushan, P. ^{[2
]}

Chiaro, B. ^{[1
]}

Megrant, A. ^{[2
]}

Kelly, J. ^{[2
]}

Chen, Zijun ^{[2
]}

Satzinger, K. ^{[2
]}

Barends, R. ^{[2
]}

Arute, F. ^{[2
]}

Arya, K. ^{[2
]}

Babbush, R. ^{[2
]}

Bacon, D. ^{[2
]}

Bardin, J. C. ^{[2
,3
]}

Boixo, S. ^{[2
]}

Buell, D. ^{[2
]}

Burkett, B. ^{[2
]}

Chen, Yu ^{[2
]}

Collins, R. ^{[2
]}

Farhi, E. ^{[2
]}

Fowler, A. ^{[2
]}

Gidney, C. ^{[2
]}

Giustina, M. ^{[2
]}

Graff, R. ^{[2
]}

Harrigan, M. ^{[2
]}

Huang, T. ^{[2
]}

Isakov, S., V ^{[2
]}

Jeffrey, E. ^{[2
]}

Jiang, Z. ^{[2
]}

Kafri, D. ^{[2
]}

Kechedzhi, K. ^{[2
]}

Klimov, P. ^{[2
]}

Korotkov, A. ^{[2
]}

Kostritsa, F. ^{[2
]}

Landhuis, D. ^{[2
]}

Lucero, E. ^{[2
]}

McClean, J. ^{[2
]}

McEwen, M. ^{[1
]}

Mi, X. ^{[2
]}

Mohseni, M. ^{[2
]}

Mutus, J. Y. ^{[2
]}

Naaman, O. ^{[2
]}

Neeley, M. ^{[2
]}

Niu, M. ^{[2
]}

Petukhov, A. ^{[2
]}

Quintana, C. ^{[2
]}

Rubin, N. ^{[2
]}

Sank, D. ^{[2
]}

Smelyanskiy, V ^{[2
]}

机构：

[1] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[2] Google Res, Santa Barbara, CA 93117 USA

[3] Univ Massachusetts, Dept Elect & Comp Engn, Amherst, MA 01003 USA

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 125卷 / 12期

关键词：

SUPREMACY;

D O I：

10.1103/PhysRevLett.125.120504

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Quantum algorithms offer a dramatic speedup for computational problems in material science and chemistry. However, any near-term realizations of these algorithms will need to be optimized to fit within the finite resources offered by existing noisy hardware. Here, taking advantage of the adjustable coupling of gmon qubits, we demonstrate a continuous two-qubit gate set that can provide a threefold reduction in circuit depth as compared to a standard decomposition. We implement two gate families: an imaginary swap-like (iSWAP-like) gate to attain an arbitrary swap angle, theta, and a controlled-phase gate that generates an arbitrary conditional phase, phi. Using one of each of these gates, we can perform an arbitrary two-qubit gate within the excitation-preserving subspace allowing for a complete implementation of the so-called Fermionic simulation (fSim) gate set. We benchmark the fidelity of the iSWAP-like and controlled-phase gate families as well as 525 other 'Sim gates spread evenly across the entire tSim(theta, phi) parameter space, achieving a purity-limited average two-qubit Pauli error of 3.8 x 10(-3) per fSim gate.

引用

页数：6

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