Demonstration of unpartible entanglement

• URL: http://arxiv.org/abs/2606.30468v1
• Date: Mon, 29 Jun 2026 15:30:11 GMT
• Title: Demonstration of unpartible entanglement
• Abstract summary: We realize a type of quantum entanglement that persists even if the parties, in our case modes, are transformed.<n>This safeguards the performance of entanglement in real-world applications, such as quantum communication settings involving noise and untrusted parties.
• Score: 0.29316801942271303
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We report on the first experimental verification of mode-independent entanglement. Commonly, the entanglement of a state is firmly based on pre-defined parties that are correlated, and the state might be disentangled when the definition of the parties is changed. Exceeding this party-dependent concept, we realize a type of quantum entanglement that persists even if the parties, in our case modes, are transformed. This safeguards the performance of entanglement in real-world applications, such as quantum communication settings involving noise and untrusted parties. For the state generation, we present an experimental scheme based on a fully reconfigurable temporally multiplexed interferometer with measurement-induced nonlinearities, which generates heralded two-photon states in two modes that are entangled for all choices of orthonormal mode basis. For the certification process, we utilize a tailored quantum-state tomography, achieving fidelities that validate the presence of mode-independent entanglement as a resilient and operationally advantageous quantum correlation.

Related papers

• Post-Selection Probability and Fidelity of Bidirectional Teleportation [18.957108140592716]
  A bidirectional teleportation protocol was proposed to implement a digital SWAP operation between qubits.<n>We provide a study of two central quantities that characterize the protocol, the post-selection probability and the fidelity.<n>Our findings offer practical guidance for the implementation of the protocol on realistic quantum devices.
  arXiv  Detail & Related papers  (2026-06-15T19:53:53Z)
• Mean-field and fluctuation dynamics in off-resonant two-mode atom-field interactions [39.146761527401424]
  We study a two-level system coupled to two quantized electromagnetic modes within the Jaynes-Cummings framework.<n>While the single-mode model is exactly solvable due to its conserved excitation number, the two-mode model extension presents a fundamental challenge.<n>Our scheme separates the dynamics into a dominant, exactly solvable semiclassical component, the atom interacting with the mean fields of both modes.
  arXiv  Detail & Related papers  (2026-05-19T22:30:51Z)
• Efficient classical training of model-free quantum photonic reservoir [28.404018926483985]
  We introduce a training strategy for photonic quantum extreme learning machines.<n>Both the learning stage and the optimization of the measurement settings are performed entirely with classical light.<n>We experimentally show that the resulting classical-to-quantum transfer enables accurate reconstruction of single-qubit Pauli observables.
  arXiv  Detail & Related papers  (2026-04-14T08:29:38Z)
• Semi-device-independent randomness certification on discretized continuous-variable platforms [33.83993649730681]
  We present a semi-device-independent scheme for randomness certification tailored to continuous-variable implementations.<n>We show that simple optical setups can achieve dimension-witness violations that certify positive min-entropy.
  arXiv  Detail & Related papers  (2025-11-07T19:23:46Z)
• Multimode Bosonic State Tomography with Single-Shot Joint Parity Measurement of a Trapped Ion [3.8758525789991896]
  We demonstrate a novel scheme for reconstructing a continuous-variable quantum state using the direct single-shot measurement of the joint parity of the phonon states of a trapped ion.<n>We show that the single-shot joint parity measurement can be used to detect parity-flip errors in real time.
  arXiv  Detail & Related papers  (2025-06-14T21:05:06Z)
• Symmetries, Conservation Laws and Entanglement in Non-Hermitian Fermionic Lattices [37.69303106863453]
  Non-Hermitian quantum many-body systems feature steady-state entanglement transitions driven by unitary dynamics and dissipation.<n>We show that the steady state is obtained by filling single-particle right eigenstates with the largest imaginary part of the eigenvalue.<n>We illustrate these principles in the Hatano-Nelson model with periodic boundary conditions and the non-Hermitian Su-Schrieffer-Heeger model.
  arXiv  Detail & Related papers  (2025-04-11T14:06:05Z)
• Device-independent secure correlations in sequential quantum scenarios [44.99833362998488]
  Device-independent quantum information is attracting significant attention, particularly for its applications in information security.<n>We propose a systematic approach to designing sequential quantum protocols for device-independent security.<n>We analytically prove that, with this systematic construction, the resulting ideal correlations are secure in the sense that they cannot be reproduced as a statistical mixture of other correlations.
  arXiv  Detail & Related papers  (2025-03-18T16:45:20Z)
• Interferometric detection of continuous-variable entanglement using two states [0.0]
  We derive mode-operator-based witnesses for continuous-variable bipartite entanglement using the interference of two states.<n>We show how one can access higher moments of the mode operators, crucial for detecting entanglement of non-Gaussian states.
  arXiv  Detail & Related papers  (2025-02-20T16:25:04Z)
• Robust self-testing of the $m-$partite maximally entangled state and observables [0.0]
  We propose a simple and efficient self-testing protocol that certifies the state and observables based on the optimal quantum violation of the Svetlichny inequality. Our method leverages an elegant sum-of-squares approach to derive the optimal quantum value of the Svetlichny functional, devoid of assuming the dimension of the quantum system.
  arXiv  Detail & Related papers  (2024-08-20T11:03:37Z)
• Operational simultaneous correlations in complementary bases of bipartite states via one-sided semi-device-independent steering [0.0]
  We show that for any bipartite state, such measure of simultaneous correlations in two mutually unbiased bases can be operationally identified as exhibiting one-sided semi-device-independent steering.<n>For two-qubit Bell-diagonal states, quantifying one-sided semi-device-independent steerability provides an operational quantification of information-theoretic quantification of simultaneous correlations in mutually unbiased bases.<n>We invoke quantum steering ellipsoid formalism to shed intuitions on the operational characterization of simultaneous correlations in complementary bases of two-qubit states via one-sided semi-device-independent steerability.
  arXiv  Detail & Related papers  (2024-07-16T14:17:59Z)
• Measurement-Device-Independent Detection of Beyond-Quantum State [53.64687146666141]
  We propose a measurement-device-independent (MDI) test for beyond-quantum state detection. We discuss the importance of tomographic completeness of the input sets to the detection.
  arXiv  Detail & Related papers  (2023-12-11T06:40:13Z)
• Experimental assessment of physical realism in a quantum-controlled device [0.0]
  Bohr's complementarity principle has been challenged by quantum delayed-choice experiments. We consider a framework that employs an operational criterion of physical reality to diagnosis the system directly from the quantum state.
  arXiv  Detail & Related papers  (2021-04-16T14:56:09Z)
• Quantum Zeno effect appears in stages [64.41511459132334]
  In the quantum Zeno effect, quantum measurements can block the coherent oscillation of a two level system by freezing its state to one of the measurement eigenstates. We show that the onset of the Zeno regime is marked by a $textitcascade of transitions$ in the system dynamics as the measurement strength is increased.
  arXiv  Detail & Related papers  (2020-03-23T18:17:36Z)
• Einselection from incompatible decoherence channels [62.997667081978825]
  We analyze an open quantum dynamics inspired by CQED experiments with two non-commuting Lindblad operators. We show that Fock states remain the most robust states to decoherence up to a critical coupling.
  arXiv  Detail & Related papers  (2020-01-29T14:15:19Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.