Quantum information ≈ Quantum information
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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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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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Secure quantum key distribution with realistic devices Open
In principle, quantum key distribution (QKD) offers information-theoretic security based on the laws of physics. In practice, however, the imperfections of realistic devices might introduce deviations from the idealized models used in secu…
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Quantum resource theories Open
Quantum resource theories (QRTs) offer a highly versatile and powerful\nframework for studying different phenomena in quantum physics. From quantum\nentanglement to quantum computation, resource theories can be used to quantify\na desirabl…
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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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Molecular spins for quantum computation Open
Spins in solids or in molecules possess discrete energy levels, and the associated quantum states can be tuned and coherently manipulated by means of external electromagnetic fields. Spins therefore provide one of the simplest platforms to…
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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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Quantum random number generators Open
Random numbers are a fundamental resource in science and engineering with\nimportant applications in simulation and cryptography. The inherent randomness\nat the core of quantum mechanics makes quantum systems a perfect source of\nentropy.…
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Engineering Non-Linear Decay Dynamics: Pulse-Level Control and Software-Defined Qubit Rescue on Superconducting Processors Open
The scalability of Noisy Intermediate-Scale Quantum (NISQ) devices is fundamentally constrained by material defects, most notably Two-Level Systems (TLS) that induce resonant decoherence in superconducting qubits. These defects severely li…
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Chaos in quantum channels Open
We study chaos and scrambling in unitary channels by considering their\nentanglement properties as states. Using out-of-time-order correlation\nfunctions to diagnose chaos, we characterize the ability of a channel to\nprocess quantum infor…
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Quantum Secure Direct Communication with Quantum Memory Open
Quantum communication provides an absolute security advantage, and it has been widely developed over the past 30 years. As an important branch of quantum communication, quantum secure direct communication (QSDC) promotes high security and …
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Scalable designs for quasiparticle-poisoning-protected topological quantum computation with Majorana zero modes Open
We present designs for scalable quantum computers composed of qubits encoded in aggregates of four or more Majorana zero modes, realized at the ends of topological superconducting wire segments that are assembled into superconducting islan…
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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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Roadmap of optical communications Open
Lightwave communications is a necessity for the information age. Optical links provide enormous bandwidth, and the optical fiber is the only medium that can meet the modern society's needs for transporting massive amounts of data over long…
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Experimental Ten-Photon Entanglement Open
We report the first experimental demonstration of quantum entanglement among ten spatially separated single photons. A near-optimal entangled photon-pair source was developed with simultaneously a source brightness of ∼12 MHz/W, a collecti…
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High-dimensional intracity quantum cryptography with structured photons Open
Quantum key distribution (QKD) promises information-theoretically secure\ncommunication, and is already on the verge of commercialization. Thus far,\ndifferent QKD protocols have been proposed theoretically and implemented\nexperimentally …
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Measuring the scrambling of quantum information Open
We provide a protocol to measure out-of-time-order correlation functions.\nThese correlation functions are of theoretical interest for diagnosing the\nscrambling of quantum information in black holes and strongly interacting\nquantum syste…
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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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Quantum speed limits: from Heisenberg's uncertainty principle to optimal quantum control Open
One of the most widely known building blocks of modern physics is Heisenberg's indeterminacy principle. Among the different statements of this fundamental property of the full quantum mechanical nature of physical reality, the uncertainty …
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Quantum Error Correction in Scrambling Dynamics and Measurement-Induced Phase Transition Open
We analyze the dynamics of entanglement entropy in a generic quantum many-body open system from the perspective of quantum information and error corrections. We introduce a random unitary circuit model with intermittent projective measurem…
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18-Qubit Entanglement with Six Photons’ Three Degrees of Freedom Open
Full control of multiple degrees of freedom of multiple particles represents a fundamental ability for quantum information processing. We experimentally demonstrate an 18-qubit Greenberger-Horne-Zeilinger entanglement by simultaneous explo…
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Quantum advantage with shallow circuits Open
Quantum outperforms classical Quantum computers are expected to be better at solving certain computational problems than classical computers. This expectation is based on (well-founded) conjectures in computational complexity theory, but r…
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Quantum Generative Adversarial Networks for learning and loading random distributions Open
Quantum algorithms have the potential to outperform their classical counterparts in a variety of tasks. The realization of the advantage often requires the ability to load classical data efficiently into quantum states. However, the best k…
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Long-Distance Continuous-Variable Quantum Key Distribution over 202.81 km of Fiber Open
Quantum key distribution provides secure keys resistant to code-breaking quantum computers. The continuous-variable version of quantum key distribution offers the advantages of higher secret key rates in metropolitan areas, as well as the …
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Quantum Teleportation in High Dimensions Open
Quantum teleportation allows a "disembodied" transmission of unknown quantum states between distant quantum systems. Yet, all teleportation experiments to date were limited to a two-dimensional subspace of quantized multiple levels of the …