Arbitrary controlled-phase gate on fluxonium qubits using differential ac Stark shifts DOI Creative Commons
Haonan Xiong, Quentin Ficheux,

Aaron Somoroff

et al.

Physical Review Research, Journal Year: 2022, Volume and Issue: 4(2)

Published: April 15, 2022

Large scale quantum computing motivates the invention of two-qubit gate schemes that not only maximize fidelity but also draw minimal resources. In case superconducting qubits, weak anharmonicity transmons imposes profound constraints on design, leading to increased complexity devices and control protocols. Here we demonstrate a resource-efficient over interaction strongly-anharmonic fluxonium qubits. Namely, applying an off-resonant drive noncomputational transitions in pair capacitively-coupled fluxoniums induces $\text{ZZ}$ due unequal ac Stark shifts computational levels. With continuous choice frequency amplitude, can either cancel static term or increase it by order magnitude enable controlled-phase (CP) with arbitrary programmed phase shift. The cross-entropy benchmarking these non-Clifford operations yields sub $1%$ error, limited solely incoherent processes. Our result demonstrates advantages circuits designing next generation processors.

Language: Английский

Qudits and High-Dimensional Quantum Computing DOI Creative Commons
Yuchen Wang, Zixuan Hu, Barry C. Sanders

et al.

Frontiers in Physics, Journal Year: 2020, Volume and Issue: 8

Published: Nov. 10, 2020

Qudit is a multi-level computational unit alternative to the conventional 2-level qubit. Compared qubit, qudit provides larger state space store and process information, thus can provide reduction of circuit complexity, simplification experimental setup enhancement algorithm efficiency. This review an overview qudit-based quantum computing covering variety topics ranging from building, design, methods. We first discuss gate universality gates including pi/8 gate, SWAP multi-level-controlled gate. then present version several representative algorithms Deutsch-Jozsa algorithm, Fourier transform, phase estimation algorithm. Finally we various physical realizations for computation such as photonic platform, iron trap, nuclear magnetic resonance.

Language: Английский

Citations

336
A universal qudit quantum processor with trapped ions DOI
Martin Ringbauer, M. Meth,

Lukas Postler

et al.

Nature Physics, Journal Year: 2022, Volume and Issue: 18(9), P. 1053 - 1057

Published: July 21, 2022

Language: Английский

Citations

235
Engineering high-coherence superconducting qubits DOI
Irfan Siddiqi

Nature Reviews Materials, Journal Year: 2021, Volume and Issue: 6(10), P. 875 - 891

Published: Sept. 23, 2021

Language: Английский

Citations

198
High-fidelity qutrit entangling gates for superconducting circuits DOI Creative Commons
Noah Goss, Alexis Morvan,

Brian Marinelli

et al.

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: Dec. 5, 2022

Ternary quantum information processing in superconducting devices poses a promising alternative to its more popular binary counterpart through larger, connected computational spaces and proposed advantages simulation error correction. Although generally operated as qubits, transmons have readily addressable higher levels, making them natural candidates for operation three-level systems (qutrits). Recent works transmon realized high fidelity single qutrit operation. Nonetheless, effectively engineering high-fidelity two-qutrit entanglement remains central challenge realizing device. In this work, we apply the differential AC Stark shift implement flexible, microwave-activated, dynamic cross-Kerr between two fixed-frequency qutrits, expanding on work performed ZZ interaction with qubits. We then use engineer efficient, CZ† CZ gates, estimated process fidelities of 97.3(1)% 95.2(3)% respectively, significant step forward operating qutrits multi-transmon

Language: Английский

Citations

84
Experimental High-Dimensional Greenberger-Horne-Zeilinger Entanglement with Superconducting Transmon Qutrits DOI
Alba Cervera-Lierta, Mario Krenn, Alán Aspuru‐Guzik

et al.

Physical Review Applied, Journal Year: 2022, Volume and Issue: 17(2)

Published: Feb. 23, 2022

Multipartite entanglement is one of the core concepts in quantum information science with broad applications that span from condensed matter physics to foundation tests. Although its most studied and tested forms encompass two-dimensional systems, current platforms technically allow manipulation additional levels. We report experimental demonstration certification a high-dimensional multipartite entangled state superconducting processor. generate three-qutrit Greenberger-Horne-Zeilinger by designing necessary pulses perform operations. obtain fidelity $76\mathrm{%}\ifmmode\pm\else\textpm\fi{}1\mathrm{%}$, proving generation genuine three-partite three-dimensional state. To this date, only photonic devices have been able create certify these states. Our work demonstrates another platform, ready exploit programmable device accessed on cloud can be used design execute experiments beyond binary computation.

Language: Английский

Citations

77
Native qudit entanglement in a trapped ion quantum processor DOI Creative Commons
Pavel Hrmo, Benjamin Wilhelm, Lukas Gerster

et al.

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: April 19, 2023

Quantum information carriers, just like most physical systems, naturally occupy high-dimensional Hilbert spaces. Instead of restricting them to a two-level subspace, these (qudit) quantum systems are emerging as powerful resource for the next generation processors. Yet harnessing potential requires efficient ways generating desired interaction between them. Here, we experimentally demonstrate an implementation native two-qudit entangling gate in trapped-ion qudit system up dimension $5$. This is achieved by generalizing recently proposed light-shift mechanism generate genuine entanglement single application gate. The seamlessly adapts local with calibration overhead that independent dimension.

Language: Английский

Citations

60
Quantum many-body simulations on digital quantum computers: State-of-the-art and future challenges DOI Creative Commons
Benedikt Fauseweh

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: March 8, 2024

Abstract Simulating quantum many-body systems is a key application for emerging processors. While analog simulation has already demonstrated advantage, its digital counterpart recently become the focus of intense research interest due to availability devices that aim realize general-purpose computers. In this perspective, we give selective overview currently pursued approaches, review advances in by comparing non-variational with variational approaches and identify hardware algorithmic challenges. Based on review, question arises: What are most promising problems can be tackled simulation? We argue qualitative nature much more suitable near-term then aiming purely quantitative accuracy improvement.

Language: Английский

Citations

43
Simulating two-dimensional lattice gauge theories on a qudit quantum computer DOI Creative Commons
M. Meth, Jinglei Zhang, Jan F. Haase

et al.

Nature Physics, Journal Year: 2025, Volume and Issue: unknown

Published: March 25, 2025

Particle physics describes the interplay of matter and forces through gauge theories. Yet, intrinsic quantum nature theories makes important problems notoriously difficult for classical computational techniques. Quantum computers offer a promising way to overcome these roadblocks. We demonstrate two essential requirements on this path: first, we perform computation properties basic building block two-dimensional lattice electrodynamics, involving both fields matter. Second, show how refine gauge-field discretization beyond its minimal representation, using trapped-ion qudit processor, where information is encoded in several states per ion. Such qudits are ideally suited describing fields, which naturally high dimensional, leading reduced register size circuit complexity. prepare ground state model variational eigensolver observe effect dynamical quantized magnetic fields. By controlling dimension, also seamlessly different truncations. Finally, experimentally study dynamics pair creation energy. Our results open door hardware-efficient simulations with near-term devices. Qubit-based challenging as require high-dimensional encoding. Now electrodynamics has been demonstrated qudits, encode multiple ions.

Language: Английский

Citations

3
High- EJ/EC transmon qudits with up to 12 levels DOI
Z. Wang, Rayleigh W. Parker, E. Champion

et al.

Physical Review Applied, Journal Year: 2025, Volume and Issue: 23(3)

Published: March 20, 2025

Citations

2
High-fidelity three-qubit iToffoli gate for fixed-frequency superconducting qubits DOI
Yosep Kim, Alexis Morvan, Long B. Nguyen

et al.

Nature Physics, Journal Year: 2022, Volume and Issue: 18(7), P. 783 - 788

Published: May 2, 2022

Language: Английский

Citations

69