Open quantum system
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Quantum Computing in the NISQ era and beyond Open
Noisy Intermediate-Scale Quantum (NISQ) technology will be available in the near future. Quantum computers with 50-100 qubits may be able to perform tasks which surpass the capabilities of today's classical digital computers, but noise in …
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Quantum sensing Open
"Quantum sensing" describes the use of a quantum system, quantum properties, or quantum phenomena to perform a measurement of a physical quantity. Historical examples of quantum sensors include magnetometers based on superconducting quantu…
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<i>Colloquium</i>: Quantum coherence as a resource Open
The coherent superposition of states, in combination with the quantization of observables, represents one of the most fundamental features that mark the departure of quantum mechanics from the classical realm. Quantum coherence in many-bod…
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A quantum engineer's guide to superconducting qubits Open
The aim of this review is to provide quantum engineers with an introductory guide to the central concepts and challenges in the rapidly accelerating field of superconducting quantum circuits. Over the past twenty years, the field has matur…
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Circuit quantum electrodynamics Open
Quantum mechanical effects at the macroscopic level were first explored in\nJosephson junction-based superconducting circuits in the 1980's. In the last\ntwenty years, the emergence of quantum information science has intensified\nresearch …
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Adiabatic quantum computation Open
Adiabatic quantum computing (AQC) started as an approach to solving optimization problems, and has evolved into an important universal alternative to the standard circuit model of quantum computing, with deep connections to both classical …
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Quantum Machine Learning in Feature Hilbert Spaces Open
A basic idea of quantum computing is surprisingly similar to that of kernel methods in machine learning, namely, to efficiently perform computations in an intractably large Hilbert space. In this Letter we explore some theoretical foundati…
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<i>Colloquium</i>: Non-Markovian dynamics in open quantum systems Open
The dynamical behavior of open quantum systems plays a key role in many applications of quantum mechanics, examples ranging from fundamental problems, such as the environment-induced decay of quantum coherence and relaxation in many-body s…
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Colloquium: Atomic quantum gases in periodically driven optical lattices Open
Time periodic forcing in the form of coherent radiation is a standard tool\nfor the coherent manipulation of small quantum systems like single atoms. In\nthe last years, periodic driving has more and more also been considered as a\nmeans f…
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Machine learning & artificial intelligence in the quantum domain: a review of recent progress Open
Quantum information technologies, on the one hand, and intelligent learning systems, on the other, are both emergent technologies that are likely to have a transformative impact on our society in the future. The respective underlying field…
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An integrated diamond nanophotonics platform for quantum-optical networks Open
Integrated quantum nanophotonics Technologies that exploit the rules of quantum mechanics offer a potential advantage over classical devices in terms of sensitivity. Sipahigil et al. combined the quantum optical features of silicon-vacancy…
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Stimulated Raman adiabatic passage in physics, chemistry, and beyond Open
The technique of stimulated Raman adiabatic passage (STIRAP), which allows\nefficient and selective population transfer between quantum states without\nsuffering loss due to spontaneous emission, was introduced in 1990 (Gaubatz\n\\emph{et …
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Probing topological spin liquids on a programmable quantum simulator Open
Synthesizing topological order Topologically ordered matter exhibits long-range quantum entanglement. However, measuring this entanglement in real materials is extremely tricky. Now, two groups take a different approach and turn to synthet…
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Programmable quantum simulations of spin systems with trapped ions Open
Laser-cooled and trapped atomic ions form an ideal standard for the\nsimulation of interacting quantum spin models. Effective spins are represented\nby appropriate internal energy levels within each ion, and the spins can be\nmeasured with…
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The quantum technologies roadmap: a European community view Open
Within the last two decades, quantum technologies (QT) have made tremendous progress, moving from Nobel Prize award-winning experiments on quantum physics (1997: Chu, Cohen-Tanoudji, Phillips; 2001: Cornell, Ketterle, Wieman; 2005: Hall, H…
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Dynamical quantum phase transitions: a review Open
Quantum theory provides an extensive framework for the description of the equilibrium properties of quantum matter. Yet experiments in quantum simulators have now opened up a route towards the generation of quantum states beyond this equil…
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Photonic quantum information processing: A concise review Open
Photons have been a flagship system for studying quantum mechanics, advancing quantum information science, and developing quantum technologies. Quantum entanglement, teleportation, quantum key distribution, and early quantum computing demo…
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Atoms and molecules in cavities, from weak to strong coupling in quantum-electrodynamics (QED) chemistry Open
Significance Traditionally, quantum chemistry investigates molecular systems assuming that the photon field, which leads to the interaction of charged particles, is well approximated by the Coulomb interaction. On the other hand, quantum o…
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<i>Colloquium</i>: Quantum matter built from nanoscopic lattices of atoms and photons Open
This Colloquium describes a new paradigm for creating strong quantum interactions of light and matter by way of single atoms and photons in nanoscopic lattices. Beyond the possibilities for quantitative improvements for familiar phenomena …
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Simulating lattice gauge theories within quantum technologies Open
Lattice gauge theories, which originated from particle physics in the context of Quantum Chromodynamics (QCD), provide an important intellectual stimulus to further develop quantum information technologies. While one long-term goal is the …
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The Second Quantum Revolution: Role and Challenges of Molecular Chemistry Open
Implementation of modern Quantum Technologies might benefit from the remarkable quantum properties shown by molecular spin systems. In this Perspective, we highlight the role that molecular chemistry can have in the current second quantum …
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Thermalization and prethermalization in isolated quantum systems: a theoretical overview Open
The approach to thermal equilibrium, or thermalization, in isolated quantum\nsystems is among the most fundamental problems in statistical physics. Recent\ntheoretical studies have revealed that thermalization in isolated quantum\nsystems …
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Quantum Internet: Networking Challenges in Distributed Quantum Computing Open
The Quantum Internet is envisioned as the final stage of the quantum\nrevolution, opening fundamentally new communications and computing\ncapabilities, including the distributed quantum computing. But the Quantum\nInternet is governed by t…
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Data for "Realizing topologically ordered states on a quantum processor" Open
Data and code used in "Realizing topologically ordered states on a quantum processor," Satzinger et al. (2021), preprint at https://arxiv.org/abs/2104.01180
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High-Fidelity Control and Entanglement of Rydberg-Atom Qubits Open
Individual neutral atoms excited to Rydberg states are a promising platform for quantum simulation and quantum information processing. However, experimental progress to date has been limited by short coherence times and relatively low gate…
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Demonstration of quantum volume 64 on a superconducting quantum\n computing system Open
We improve the quality of quantum circuits on superconducting quantum\ncomputing systems, as measured by the quantum volume, with a combination of\ndynamical decoupling, compiler optimizations, shorter two-qubit gates, and\nexcited state p…
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Measuring Out-of-Time-Order Correlators on a Nuclear Magnetic Resonance Quantum Simulator Open
The idea of the out-of-time-order correlator (OTOC) has recently emerged in the study of both condensed matter systems and gravitational systems. It not only plays a key role in investigating the holographic duality between a strongly inte…
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Quantum Optimal Control in Quantum Technologies. Strategic Report on Current Status, Visions and Goals for Research in Europe Open
Quantum optimal control, a toolbox for devising and implementing the shapes of external fields that accomplish given tasks in the operation of a quantum device in the best way possible, has evolved into one of the cornerstones for enabling…
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Quantum repeaters: From quantum networks to the quantum internet Open
A quantum internet is the holy grail of quantum information processing, enabling the deployment of a broad range of quantum technologies and protocols on a global scale. However, numerous challenges must be addressed before the quantum int…
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The Quantum Harmonic Otto Cycle Open
The quantum Otto cycle serves as a bridge between the macroscopic world of heat engines and the quantum regime of thermal devices composed from a single element. We compile recent studies of the quantum Otto cycle with a harmonic oscillato…