Maximizing the distance-based coherence of a POVM over all unitary basis changes is proven to exactly equal its distance-based sharpness for POVMs with a common eigenbasis or common MUB structure.
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A geometric construction via shortest-distance projection to the convex set of useless states yields optimal teleportation witnesses and a necessary-and-sufficient usefulness criterion for arbitrary two-qudit states.
A support-kernel criterion shows that rank-deficient conditional states with first-order coupling at the boundary turn entanglement into two-way projective steering, including mixed cases.
Introduces correlation functional I that bounds at 2 only for GHZ-equivalent states and yields LU-invariant E_GHZ in [0,1] equaling 1 iff the state is GHZ-type.
Energy and heat measurements provide witnesses that certify quantum magic without full state tomography.
Stabilizer AME states do not exist for N=4n qudits of even local dimension d; optimal mixed AME states of purity 1/2 exist for d=6.
In random quantum automaton ensembles, the subsystem symmetrization scale depends on the initial state's participation entropy, and the onset of U(1) entanglement asymmetry coincides with the onset of subsystem coherence.
Analytic computation of logarithmic negativity and closed-form negativity cores for vacuum entanglement between two bounded regions in 1+1D free massless scalar QFT.
For two-qubit entangled states, existence of one pure steered state implies two-way EPR steering via symmetry of tangent points on steering ellipsoids.
Two universal criteria are introduced to certify genuine high-dimensional quantum teleportation by fully identifying the entanglement dimension of the resource.
Phase reference of a squeezed reservoir explicitly controls the magnitude, structure, and thermal robustness of steady-state entanglement in Gaussian open quantum systems.
Constructs non-linear entanglement witnesses from any given linear witness that detect additional entangled states, including PPT entangled states, in d1 ⊗ d2 systems and are experimentally realizable via local observables.
A quantum-instrument framework shows that nonlocality sharing is limited by Kraus-structure-dependent back-action, enabling unbounded unilateral sharing across many observers and some bilateral sharing.
Non-local stabilizer entropies of fermionic Gaussian states admit a closed form from reduced Majorana covariance eigenvalues when minimized over local Gaussian unitaries.
Local NOT operations convert entanglement sudden death to asymptotic decay for genuine multipartite concurrence in small multipartite systems under amplitude damping, while teleportation fidelity preservation requires flipping all qubits in some cases and allows use of biseparable states in GHZ CQT.
A mapping from stabilizer generators to dual Ising spins converts hidden nonlocal order in stabilizer codes into observables with extensive quantum Fisher information density.
A non-chaotic mean-ergodic system from the double kicked top exhibits strong ETH with D^{-1/2} diagonal fluctuations and parameter-independent off-diagonal distributions.
A driven two-level system generates distributable entanglement via Mollow sidebands, but near-maximal remote entanglement stabilization requires added filter cavities and optimized driving parameters explained by an effective two-mode squeezing model.
Experimental detection of entanglement in multimode Gaussian states via high-order intensity correlation moments from parametric down-conversion sources.
Bhabha scattering with an initially entangled spectator particle generates genuine tripartite entanglement quantified via four metrics, with scattering momentum and initial entanglement as key resources and relaxed monogamy in the non-relativistic regime.
Photon addition and subtraction enhance Gaussian-source heralded generation of dual-rail Bell, GHZ, and W states with improved fidelity and success probability.
Post-selected von Neumann measurements enhance quadrature squeezing, Wigner negativity, bipartite correlations, and phase sensitivity in entangled coherent states compared to standard metrology.
Quantum mutual information and coherence in top-quark pairs produced via QCD depend on kinematic variables, and the maximum value of an intrinsic relation increases with the gluon fraction in mixed initial states.
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Maximal coherence of quantum measurement and the resource theory of sharpness
Maximizing the distance-based coherence of a POVM over all unitary basis changes is proven to exactly equal its distance-based sharpness for POVMs with a common eigenbasis or common MUB structure.
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Geometric Construction of Optimal Teleportation Witnesses
A geometric construction via shortest-distance projection to the convex set of useless states yields optimal teleportation witnesses and a necessary-and-sufficient usefulness criterion for arbitrary two-qudit states.
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Boundary Geometry Turns Entanglement into Steering
A support-kernel criterion shows that rank-deficient conditional states with first-order coupling at the boundary turn entanglement into two-way projective steering, including mixed cases.
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A measure for genuine tripartite entanglement
Introduces correlation functional I that bounds at 2 only for GHZ-equivalent states and yields LU-invariant E_GHZ in [0,1] equaling 1 iff the state is GHZ-type.
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Every Little Thing Heat Does Is Magic
Energy and heat measurements provide witnesses that certify quantum magic without full state tomography.
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On Non-Existence of Stabilizer Absolutely Maximally Entangled States in Even Local Dimensions
Stabilizer AME states do not exist for N=4n qudits of even local dimension d; optimal mixed AME states of purity 1/2 exist for d=6.
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Entanglement Asymmetry in Random Quantum Automata
In random quantum automaton ensembles, the subsystem symmetrization scale depends on the initial state's participation entropy, and the onset of U(1) entanglement asymmetry coincides with the onset of subsystem coherence.
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The negativity core of a 1+1D massless scalar quantum field
Analytic computation of logarithmic negativity and closed-form negativity cores for vacuum entanglement between two bounded regions in 1+1D free massless scalar QFT.
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One pure steered state implies Einstein-Podolsky-Rosen steering
For two-qubit entangled states, existence of one pure steered state implies two-way EPR steering via symmetry of tangent points on steering ellipsoids.
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General Criteria for Certifying Genuine High-Dimensional Quantum Teleportation
Two universal criteria are introduced to certify genuine high-dimensional quantum teleportation by fully identifying the entanglement dimension of the resource.
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Phase-Reference Control of Steady-State Entanglement in Open Quantum Systems
Phase reference of a squeezed reservoir explicitly controls the magnitude, structure, and thermal robustness of steady-state entanglement in Gaussian open quantum systems.
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Construction of a Non-Linear Entanglement Witness Operator in Arbitrary Dimension Using a Given Linear Witness Operator
Constructs non-linear entanglement witnesses from any given linear witness that detect additional entangled states, including PPT entangled states, in d1 ⊗ d2 systems and are experimentally realizable via local observables.
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Unified Framework for Quantum Resource Recycling via Instrument-Dependent Back-action
A quantum-instrument framework shows that nonlocality sharing is limited by Kraus-structure-dependent back-action, enabling unbounded unilateral sharing across many observers and some bilateral sharing.
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Non-Local Magic Resources for Fermionic Gaussian States
Non-local stabilizer entropies of fermionic Gaussian states admit a closed form from reduced Majorana covariance eigenvalues when minimized over local Gaussian unitaries.
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Decoherence Mitigation with Local NOT Gates in Multipartite Systems
Local NOT operations convert entanglement sudden death to asymptotic decay for genuine multipartite concurrence in small multipartite systems under amplitude damping, while teleportation fidelity preservation requires flipping all qubits in some cases and allows use of biseparable states in GHZ CQT.
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Assembling Extensive Quantum Fisher Information in Stabilizer Systems
A mapping from stabilizer generators to dual Ising spins converts hidden nonlocal order in stabilizer codes into observables with extensive quantum Fisher information density.
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Strong Eigenstate Thermalization from Mean-Ergodic Non-chaotic Dynamics
A non-chaotic mean-ergodic system from the double kicked top exhibits strong ETH with D^{-1/2} diagonal fluctuations and parameter-independent off-diagonal distributions.
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Driven two-level systems as a minimal resource for remote entanglement stabilization
A driven two-level system generates distributable entanglement via Mollow sidebands, but near-maximal remote entanglement stabilization requires added filter cavities and optimized driving parameters explained by an effective two-mode squeezing model.
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Experimental detection of entanglement in multimode Gaussian states from high-order intensity correlation moments
Experimental detection of entanglement in multimode Gaussian states via high-order intensity correlation moments from parametric down-conversion sources.
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Genuine tripartite entanglement in Bhabha scattering with an entangled spectator particle
Bhabha scattering with an initially entangled spectator particle generates genuine tripartite entanglement quantified via four metrics, with scattering momentum and initial entanglement as key resources and relaxed monogamy in the non-relativistic regime.
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Heralded entangled state generation enhanced by photon addition and subtraction
Photon addition and subtraction enhance Gaussian-source heralded generation of dual-rail Bell, GHZ, and W states with improved fidelity and success probability.
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Reshaping nonclassical properties and metrological performance of entangled coherent states via post-selected von Neumann measurements
Post-selected von Neumann measurements enhance quadrature squeezing, Wigner negativity, bipartite correlations, and phase sensitivity in entangled coherent states compared to standard metrology.
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Quantum mutual information, coherence and unified relations of top quarks in QCD processes
Quantum mutual information and coherence in top-quark pairs produced via QCD depend on kinematic variables, and the maximum value of an intrinsic relation increases with the gluon fraction in mixed initial states.