Quantum decoherence ≈ Quantum decoherence
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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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Error Mitigation for Short-Depth Quantum Circuits Open
Two schemes are presented that mitigate the effect of errors and decoherence in short-depth quantum circuits. The size of the circuits for which these techniques can be applied is limited by the rate at which the errors in the computation …
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Efficient gates for quantum computing Open
For superconducting qubits, microwave pulses drive rotations around the Bloch\nsphere. The phase of these drives can be used to generate zero-duration\narbitrary "virtual" Z-gates which, combined with two $X_{\\pi/2}$ gates, can\ngenerate …
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Quantum spin dynamics and entanglement generation with hundreds of trapped ions Open
Hundreds of ions simulate magnetism Strongly interacting quantum systems present a challenge to computational methods even at a relatively low particle number of a few dozen. Researchers are looking to tackle such problems by simulating th…
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Hybrid quantum-classical hierarchy for mitigation of decoherence and determination of excited states Open
Using quantum devices supported by classical computational resources is a\npromising approach to quantum-enabled computation. One example of such a hybrid\nquantum-classical approach is the variational quantum eigensolver (VQE) built\nto u…
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Understanding the Surface Hopping View of Electronic Transitions and Decoherence Open
We present a current, up-to-date review of the surface hopping methodology for solving nonadiabatic problems, 25 years after Tully published the fewest switches surface hopping algorithm. After reviewing the original motivation for and fai…
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Subradiance in a Large Cloud of Cold Atoms Open
Since Dicke's seminal paper on coherence in spontaneous radiation by atomic ensembles, superradiance has been extensively studied. Subradiance, on the contrary, has remained elusive, mainly because subradiant states are weakly coupled to t…
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Decoherence-Free Interaction between Giant Atoms in Waveguide Quantum Electrodynamics Open
In quantum-optics experiments with both natural and artificial atoms, the atoms are usually small enough that they can be approximated as pointlike compared to the wavelength of the electromagnetic radiation with which they interact. Howev…
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Ultra-long coherence times amongst room-temperature solid-state spins Open
Solid-state single spins are promising resources for quantum sensing, quantum-information processing and quantum networks, because they are compatible with scalable quantum-device engineering. However, the extension of their coherence time…
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Controlling open quantum systems: tools, achievements, and limitations Open
The advent of quantum devices, which exploit the two essential elements of quantum physics, coherence and entanglement, has sparked renewed interest in the control of open quantum systems. Successful implementations face the challenge of p…
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Quantum control of a nanoparticle optically levitated in cryogenic free space Open
ISSN:0028-0836
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Assisted Distillation of Quantum Coherence Open
We introduce and study the task of assisted coherence distillation. This task arises naturally in bipartite systems where both parties work together to generate the maximal possible coherence on one of the subsystems. Only incoherent opera…
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Observation of an environmentally insensitive solid-state spin defect in diamond Open
In search of the right diamond defect Certain defects in diamond are among the most promising physical implementations of qubits, the building blocks of quantum computers. However, identifying a defect with balanced properties is tricky: N…
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Quantum superposition of massive objects and the quantization of gravity Open
We analyse a gedankenexperiment previously considered by Mari et al. that\ninvolves quantum superpositions of charged and/or massive bodies ("particles")\nunder the control of the observers, Alice and Bob. In the electromagnetic case,\nwe …
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The role of quantum measurement in stochastic thermodynamics Open
This article sets up a new formalism to investigate stochastic thermodynamics in the quantum regime, where stochasticity and irreversibility primarily come from quantum measurement. In the absence of any bath, we define a purely quantum co…
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Correlating Decoherence in Transmon Qubits: Low Frequency Noise by Single Fluctuators Open
We report on long-term measurements of a highly coherent, nontunable superconducting transmon qubit, revealing low-frequency burst noise in coherence times and qubit transition frequency. We achieve this through a simultaneous measurement …
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Superabsorption in an organic microcavity: Toward a quantum battery Open
In a major step toward the development of a quantum battery, superabsorption has been achieved in an organic microcavity.
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Decoherence of ensembles of nitrogen-vacancy centers in diamond Open
We present a combined theoretical and experimental study of solid-state spin\ndecoherence in an electronic spin bath, focusing specifically on ensembles of\nnitrogen vacancy (NV) color centers in diamond and the associated\nsubstitutional …
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Universal Lindblad equation for open quantum systems Open
We develop a Markovian master equation in the Lindblad form that enables the\nefficient study of a wide range of open quantum many-body systems that would be\ninaccessible with existing methods. The validity of the master equation is\nbase…
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Strain-Tunable GaAs Quantum Dot: A Nearly Dephasing-Free Source of Entangled Photon Pairs on Demand Open
We report on the observation of nearly maximally entangled photon pairs from semiconductor quantum dots, without resorting to postselection techniques. We use GaAs quantum dots integrated on a patterned piezoelectric actuator capable of su…
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Cavity-mediated collective spin-exchange interactions in a strontium superradiant laser Open
An atom-coupling cavity Ensembles of atoms have emerged as powerful simulators of many-body dynamics. Engineering controllable interactions between the atoms is crucial, be it direct or through a mediator. Norcia et al. developed a flexibl…
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Gravitational decoherence Open
We discuss effects of loss of coherence in low energy quantum systems caused by or related to gravitation, referred to as gravitational decoherence. These effects, resulting from random metric fluctuations, for instance, promise to be acce…
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Quantum units from the topological engineering of molecular graphenoids Open
Controlling quantum defects in graphene The development of quantum technologies relies on the ability to fabricate and engineer materials with robust quantum properties. The controlled introduction of defects in semiconductors is one of th…
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Environment-Assisted Quantum Transport in a 10-qubit Network Open
The way in which energy is transported through an interacting system governs fundamental properties in nature such as thermal and electric conductivity or phase changes. Remarkably, environmental noise can enhance the transport, an effect …
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<i>Colloquium</i>: Persistent spin textures in semiconductor nanostructures Open
Device concepts in semiconductor spintronics make long spin lifetimes desirable, and the requirements put on spin control by schemes of quantum information processing are even more demanding. Unfortunately, due to spin-orbit coupling elect…
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Electron Dynamics upon Ionization of Polyatomic Molecules: Coupling to Quantum Nuclear Motion and Decoherence Open
Knowledge about the electronic motion in molecules is essential for our understanding of chemical reactions and biological processes. The advent of attosecond techniques opens up the possibility to induce electronic motion, observe it in r…
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Efficient generation of entangled multi-photon graph states from a single atom Open
Entanglement is a powerful concept with an enormous potential for scientific and technological advances. A central focus in modern research is to extend the generation and control of entangled states from few to many qubits, and protect th…
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Quantum Information Scrambling in a Trapped-Ion Quantum Simulator with Tunable Range Interactions Open
In ergodic many-body quantum systems, locally encoded quantum information becomes, in the course of time evolution, inaccessible to local measurements. This concept of "scrambling" is currently of intense research interest, entailing a dee…
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Nonadiabatic Excited-State Dynamics with Machine Learning Open
We show that machine learning (ML) can be used to accurately reproduce nonadiabatic excited-state dynamics with decoherence-corrected fewest switches surface hopping in a 1-D model system. We propose to use ML to significantly reduce the s…
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Deterministic Remote Entanglement of Superconducting Circuits through Microwave Two-Photon Transitions Open
Large-scale quantum information processing networks will most probably require the entanglement of distant systems that do not interact directly. This can be done by performing entangling gates between standing information carriers, used a…