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Certifying the quantumness of a nuclear spin qudit through its uniform precession [28.4073170440133]
We certify the quantumness of exotic states of a nuclear spin through its uniform precession. The experiment is performed on a single spin-7/2 $123$Sb nucleus implanted in a silicon nanoelectronic device.
arXiv Detail & Related papers (2024-10-10T06:20:41Z)
Generalized Einstein-Podolsky-Rosen Steering Paradox [18.5699135339787]
We present a generalized EPR steering paradox, which predicts a contradictory equality $2_Q=left( 1+deltaright)_C$. We test the paradox through a two-setting steering protocol, and find that the state is steerable if some specific measurement requirements are satisfied. Our construction also enlightens the building of EPR steering inequality, which may contribute to some schemes for typical quantum teleportation and quantum key distributions.
arXiv Detail & Related papers (2024-05-06T01:25:11Z)
Embezzling entanglement from quantum fields [41.94295877935867]
Embezzlement of entanglement refers to the counterintuitive possibility of extracting entangled quantum states from a reference state of an auxiliary system. We uncover a deep connection between the operational task of embezzling entanglement and the mathematical classification of von Neumann algebras.
arXiv Detail & Related papers (2024-01-14T13:58:32Z)
Scalable Spin Squeezing from Finite Temperature Easy-plane Magnetism [26.584014467399378]
We conjecture that any Hamiltonian exhibiting finite temperature, easy-plane ferromagnetism can be used to generate scalable spin squeezing. Our results provide insights into the landscape of Hamiltonians that can be used to generate metrologically useful quantum states.
arXiv Detail & Related papers (2023-01-23T18:59:59Z)
Relative Facts of Relational Quantum Mechanics are Incompatible with Quantum Mechanics [0.0]
RQM measurement arise from interactions which entangle a system $$S and an observer $A$ without decoherence. The criterion states that whenever an interpretation introduces a notion of outcomes, these outcomes must follow the probability distribution specified by the Born rule.
arXiv Detail & Related papers (2022-08-24T23:15:00Z)
Quantum indistinguishability through exchangeable desirable gambles [69.62715388742298]
Two particles are identical if all their intrinsic properties, such as spin and charge, are the same. Quantum mechanics is seen as a normative and algorithmic theory guiding an agent to assess her subjective beliefs represented as (coherent) sets of gambles. We show how sets of exchangeable observables (gambles) may be updated after a measurement and discuss the issue of defining entanglement for indistinguishable particle systems.
arXiv Detail & Related papers (2021-05-10T13:11:59Z)
Quantum time dilation in atomic spectra [62.997667081978825]
We demonstrate how quantum time dilation manifests in a spontaneous emission process. The resulting emission rate differs when compared to the emission rate of an atom prepared in a mixture of momentum wave packets. We argue that spectroscopic experiments offer a technologically feasible platform to explore the effects of quantum time dilation.
arXiv Detail & Related papers (2020-06-17T18:03:38Z)
A Steering Paradox for Einstein-Podolsky-Rosen Argument and its Extended Inequality [0.0]
We formulate the original EPR steering paradox into a contradiction equality. We perform an experimental test of the steering paradox in a two-qubit scenario. Our results deepen the understanding of quantum foundations and provide an efficient way to detect the steerability of quantum states.
arXiv Detail & Related papers (2020-04-09T03:42:44Z)
Position and spin in relativistic quantum mechanics [68.8204255655161]
The position and spin operators in the Foldy-Wouthuysen representation are quantum-mechanical counterparts of the classical position and spin variables. The spin-orbit interaction does not exist for a free particle if the conventional operators of the orbital angular momentum and the rest-frame spin are used.
arXiv Detail & Related papers (2020-03-14T07:49:40Z)
Correlations in Entangled States [0.0]
Entangled EPR spin pairs can be treated using the statistical ensemble interpretation of quantum mechanics.<n>The singlet state results from an ensemble of spin pairs each with its own specific axis of quantization.<n>It is shown that a singlet state has no classical correlations.
arXiv Detail & Related papers (2005-08-31T18:36:24Z)
Quantum "Teleportation" using local correlations [4.21830347550555]
The phenomenon called quantum "teleportation" has been formulated assuming the presence of entangled states and is interpreted as a realization of quantum non-locality.<n>In contrast, correlations from both entanglement and disentanglement upon particle spearation exists and both of these are built into the EPR pair as they move apart.
arXiv Detail & Related papers (2003-04-28T21:21:23Z)

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