Quantum state ≈ Quantum state
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Solving the quantum many-body problem with artificial neural networks Open
Machine learning and quantum physics Elucidating the behavior of quantum interacting systems of many particles remains one of the biggest challenges in physics. Traditional numerical methods often work well, but some of the most interestin…
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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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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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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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Cooling of a levitated nanoparticle to the motional quantum ground state Open
A nanoparticle trapped and cooled Cooling massive particles to the quantum ground state allows fundamental tests of quantum mechanics to be made; it would provide an experimental probe of the boundary between the classical and quantum worl…
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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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Gaussian Boson Sampling Open
Boson sampling has emerged as a tool to explore the advantages of quantum over classical computers as it does not require universal control over the quantum system, which favors current photonic experimental platforms. Here, we introduce G…
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Localization from Hilbert space shattering: From theory to physical realizations Open
We show how a finite number of conservation laws can globally `shatter'\nHilbert space into exponentially many dynamically disconnected subsectors,\nleading to an unexpected dynamics with features reminiscent of both many body\nlocalizatio…
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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 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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Toward a Definition of Complexity for Quantum Field Theory States Open
We investigate notions of complexity of states in continuous many-body quantum systems. We focus on Gaussian states which include ground states of free quantum field theories and their approximations encountered in the context of the conti…
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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 …
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Quantum Entanglement in Neural Network States Open
Machine learning, one of today’s most rapidly growing interdisciplinary fields, promises an unprecedented perspective for solving intricate quantum many-body problems. Understanding the physical aspects of the representative artificial neu…
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Quantum metasurface for multiphoton interference and state reconstruction Open
Going quantum with metamaterials Metasurfaces should allow wafer-thin surfaces to replace bulk optical components. Two reports now demonstrate that metasurfaces can be extended into the quantum optical regime. Wang et al. determined the qu…
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A Schrödinger cat living in two boxes Open
Quantum cats here and there The story of Schrödinger's cat being hidden away in a box and being both dead and alive is often invoked to illustrate the how peculiar the quantum world can be. On a twist of the dead/alive behavior, Wang et al…
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Multiparameter Estimation in Networked Quantum Sensors Open
We introduce a general model for a network of quantum sensors, and we use this model to consider the following question: When can entanglement between the sensors, and/or global measurements, enhance the precision with which the network ca…
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Quantum control of a nanoparticle optically levitated in cryogenic free space Open
ISSN:0028-0836
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Resonant metasurfaces for generating complex quantum states Open
Quantum state engineering, the cornerstone of quantum photonic technologies, mainly relies on spontaneous parametric downconversion and four-wave mixing, where one or two pump photons spontaneously decay into a photon pair. Both of these n…
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Modes and states in quantum optics Open
A few decades ago, quantum optics stood out as a new domain of physics by\nexhibiting states of light with no classical equivalent. The first\ninvestigations concerned single photons, squeezed states, twin beams and EPR\nstates, that invol…
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Optomechanical Quantum Control of a Nitrogen-Vacancy Center in Diamond Open
We demonstrate optomechanical quantum control of the internal electronic states of a diamond nitrogen-vacancy (NV) center in the resolved-sideband regime by coupling the NV to both optical fields and surface acoustic waves via a phonon-ass…
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Deep Autoregressive Models for the Efficient Variational Simulation of Many-Body Quantum Systems Open
Artificial neural networks were recently shown to be an efficient representation of highly entangled many-body quantum states. In practical applications, neural-network states inherit numerical schemes used in variational Monte Carlo metho…
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Speeding up Adiabatic Quantum State Transfer by Using Dressed States Open
We develop new pulse schemes to significantly speed up adiabatic state transfer protocols. Our general strategy involves adding corrections to an initial control Hamiltonian that harness nonadiabatic transitions. These corrections define a…
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Classification with Quantum Neural Networks on Near Term Processors Open
We introduce a quantum neural network, QNN, that can represent labeled data, classical or quantum, and be trained by supervised learning. The quantum circuit consists of a sequence of parameter dependent unitary transformations which acts …
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Quantum Information Scrambling on a Superconducting Qutrit Processor Open
The dynamics of quantum information in strongly interacting systems, known as quantum information scrambling, has recently become a common thread in our understanding of black holes, transport in exotic non-Fermi liquids, and many-body ana…
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Quantum Error Correction Open
Quantum error correction is a set of methods to protect quantum information—that is, quantum states—from unwanted environmental interactions (decoherence) and other forms of noise. The information is stored in a quantum error-correcting co…
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Quantum Enhanced Estimation of a Multidimensional Field Open
We present a framework for the quantum enhanced estimation of multiple parameters corresponding to noncommuting unitary generators. Our formalism provides a recipe for the simultaneous estimation of all three components of a magnetic field…
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Deterministic Squeezed States with Collective Measurements and Feedback Open
We demonstrate the creation of entangled, spin-squeezed states using a collective, or joint, measurement and real-time feedback. The pseudospin state of an ensemble of N=5×10^{4} laser-cooled ^{87}Rb atoms is deterministically driven to a …
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Macroscopic quantum states: Measures, fragility, and implementations Open
Large-scale quantum effects have always played an important role in the foundations of quantum theory. With recent experimental progress and the aspiration for quantum enhanced applications, the interest in macroscopic quantum effects has …
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Quantum coherence via skew information and its polygamy Open
Quantifying coherence is a key task in both quantum mechanical theory and\npractical applications. Here, a reliable quantum coherence measure is presented\nby utilizing the quantum skew information of the state of interest subject to a\nce…
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Microwave Quantum Link between Superconducting Circuits Housed in Spatially Separated Cryogenic Systems Open
Superconducting circuits are a strong contender for realizing quantum computing systems and are also successfully used to study quantum optics and hybrid quantum systems. However, their cryogenic operation temperatures and the current lack…