Prospects and applications of on-chip lasers

eLight, Год журнала: 2023, Номер 3(1)

Опубликована: Янв. 4, 2023

Integrated silicon photonics has sparked a significant ramp-up of investment in both academia and industry as scalable, power-efficient, eco-friendly solution. At the heart this platform is light source, which itself, been focus research development extensively. This paper sheds conveys our perspective on current state-of-the-art different aspects application-driven on-chip lasers. We tackle from two perspectives: device-level system-wide points view. In former, routes taken integrating lasers are explored material systems to chosen integration methodologies. Then, discussion shifted towards applications that show great prospects incorporating photonic integrated circuits (PIC) with active devices, namely, optical communications interconnects, phased array-based LiDAR, sensors for chemical biological analysis, quantum technologies, finally, computing. By leveraging myriad inherent attractive features photonics, aims inspire further PICs in, but not limited to, these substantial performance gains, green solutions, mass production.

Язык: Английский

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Very-large-scale integrated quantum graph photonics

Nature Photonics, Год журнала: 2023, Номер 17(7), С. 573 - 581

Опубликована: Апрель 6, 2023

Abstract Graphs have provided an expressive mathematical tool to model quantum-mechanical devices and systems. In particular, it has been recently discovered that graph theory can be used describe design quantum components, devices, setups systems, based on the two-dimensional lattice of parametric nonlinear optical crystals linear circuits, different standard photonic framework. Realizing such graph-theoretical hardware, however, remains extremely challenging experimentally using conventional technologies. Here we demonstrate a programmable device in very-large-scale integrated nanophotonic circuits. The monolithically integrates about 2,500 constructing synthetic photon-pair waveguide sources is fabricated eight-inch silicon-on-insulator wafer by complementary metal–oxide–semiconductor processes. We reconfigure realize process complex-weighted graphs with topologies implement tasks associated perfect matching property graphs. As two non-trivial examples, show generation genuine multipartite multidimensional entanglement structures, measurement probability distributions proportional modulus-squared hafnian (permanent) graph’s adjacency matrices. This work realizes prototype manufactured integration technologies, featuring arbitrary programmability, high architectural modularity massive manufacturing scalability.

Язык: Английский

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Hardware Efficient Quantum Simulation of Non-Abelian Gauge Theories with Qudits on Rydberg Platforms

Physical Review Letters, Год журнала: 2022, Номер 129(16)

Опубликована: Окт. 13, 2022

Non-Abelian gauge theories underlie our understanding of fundamental forces in nature, and developing tailored quantum hardware algorithms to simulate them is an outstanding challenge the rapidly evolving field simulation. Here we take approach where fields, discretized spacetime, are represented by qudits time evolved Trotter steps with multiqudit gates. This maps naturally efficiently architecture based on Rydberg tweezer arrays, long-lived internal atomic states represent qudits, required gates performed as holonomic operations supported a blockade mechanism. We illustrate proposal for minimal digitization SU(2) demonstrating significant reduction circuit depth gate errors comparison traditional qubit-based approach, which puts simulations non-Abelian within reach NISQ devices.

Язык: Английский

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High-fidelity qutrit entangling gates for superconducting circuits

Nature Communications, Год журнала: 2022, Номер 13(1)

Опубликована: Дек. 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

Язык: Английский

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Native qudit entanglement in a trapped ion quantum processor

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Апрель 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.

Язык: Английский

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Fully on-chip photonic turnkey quantum source for entangled qubit/qudit state generation

Nature Photonics, Год журнала: 2023, Номер 17(6), С. 518 - 524

Опубликована: Апрель 17, 2023

Integrated photonics has recently become a leading platform for the realization and processing of optical entangled quantum states in compact, robust scalable chip formats with applications long-distance quantum-secured communication, quantum-accelerated information non-classical metrology. However, light sources developed so far have relied on external bulky excitation lasers making them impractical, not reproducible prototype devices, hindering scalability transfer out lab into real-world applications. Here we demonstrate fully integrated source, which overcomes these challenges through combined integration laser cavity, highly efficient tunable noise suppression filter ($> 55$ dB) exploiting Vernier effect nonlinear microring photon pair generation spontaneous four-wave mixing. The hybrid source employs an electrically-pumped InP gain section Si$_3$N$_4$ low-loss system, demonstrates high performance parameters, i.e., emission over four resonant modes telecom band (bandwidth $\sim 1$ THz), remarkable detection rate 620$ Hz at coincidence-to-accidental ratio 80$. directly creates high-dimensional frequency-bin (qubits/qudits), verified by interference measurements visibilities up to $96\%$ (violating Bell-inequality) density matrix reconstruction state tomography showing fidelities $99\%$. Our approach, leveraging photonic platform, enables commercial-viable, low-cost, light-weight, field-deployable sources, quintessential practical, out-of-lab applications, e.g., processors satellite communications systems.

Язык: Английский

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Quantum many-body simulations on digital quantum computers: State-of-the-art and future challenges

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Март 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.

Язык: Английский

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Molecular nanomagnets: a viable path toward quantum information processing?

Reports on Progress in Physics, Год журнала: 2024, Номер 87(3), С. 034501 - 034501

Опубликована: Фев. 5, 2024

Abstract Molecular nanomagnets (MNMs), molecules containing interacting spins, have been a playground for quantum mechanics. They are characterized by many accessible low-energy levels that can be exploited to store and process information. This naturally opens the possibility of using them as qudits, thus enlarging tools logic with respect qubit-based architectures. These additional degrees freedom recently prompted proposal encoding qubits embedded error correction (QEC) in single molecules. QEC is holy grail computing this qudit approach could circumvent large overhead physical typical standard multi-qubit codes. Another important strength molecular extremely high degree control achieved preparing complex supramolecular structures where individual qudits linked preserving their properties coherence. particularly relevant building simulators, controllable systems able mimic dynamics other objects. The use MNMs information processing rapidly evolving field which still requires fully experimentally explored. key issues settled related scaling up number qudits/qubits addressing. Several promising possibilities being intensively explored, ranging from single-molecule transistors or superconducting devices optical readout techniques. Moreover, new chemistry also at hand, like chiral-induced spin selectivity. In paper, we will review present status interdisciplinary research field, discuss open challenges envisioned solution paths finally unleash very potential spins technologies.

Язык: Английский

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Monolithic back-end-of-line integration of phase change materials into foundry-manufactured silicon photonics

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Март 30, 2024

Язык: Английский

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Qudit Dynamical Decoupling on a Superconducting Quantum Processor

Physical Review Letters, Год журнала: 2025, Номер 134(5)

Опубликована: Фев. 4, 2025

Multilevel qudit systems are increasingly being explored as alternatives to traditional qubit due their denser information storage and processing potential. However, qudits more susceptible decoherence than qubits increased loss channels, noise sensitivity, crosstalk. To address these challenges, we develop protocols for dynamical decoupling (DD) of based on the Heisenberg-Weyl group. We implement experimentally verify DD a superconducting transmon processor that supports operation qutrits (d=3) ququarts (d=4). Specifically, demonstrate single-qudit sequences decouple from system-bath-induced decoherence. also introduce two-qudit designed suppress detrimental cross-Kerr couplings between coupled qudits. This allows us significant improvement in fidelity time-evolved qutrit Bell states. Our results highlight utility leveraging enable scalable qudit-based quantum computing.

Язык: Английский

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