Witnesses of Genuine Multipartite Entanglement and Nonlocal Measurement Back-action for Raman-scattering Quantum Systems
arXiv:2511.17211 · doi:10.1103/5wv4-fb72
Abstract
Entanglement between remote quantum mechanical systems enables a range of quantum information tasks in communication, computation and distributed sensing. Large numbers of entangled subsystems also require experimentally accessible and practically feasible methods of verifying the genuine, i.e., simultaneous, entanglement of all subsystems. We have derived a class of entanglement witnesses suitable for -states, which are states where a single excitation is coherently distributed across subsystems initially in their ground state or a state with low thermal occupation, e.g., via detection of a Raman-scattered photon. The entanglement is witnessed through violation of an inequality involving number statistics, which can be measured via detection of subsequent Raman-scattered photons. Unlike conventional, partially tomographic, witnesses, our method is experimentally accessible for both multipartite and continuous variable systems. The thermal robustness of the method is quantified by the initial thermal occupations for which violation occurs. As an alternative approach, we have derived an inequality which tests the nonlocal, or quantum coherent, nature of the photon measurement backaction which produces the -state. Violation of this alternative inequality implies the entanglement of the resulting state given the assumption of a separable initial state, under less stringent thermal constraints than the general entanglement witness. Our results are applicable to all Raman-scattering systems which can exhibit sufficient degrees of quantum indistinguishability.
arXiv comment19 pages, 10 figures
References in corpus (30)
- Quantum entanglement
- Cavity Optomechanics
- Long-distance quantum communication with atomic ensembles and linear optics
- Entanglement detection
- Remote quantum entanglement between two micromechanical oscillators
- Measurement-Induced Entanglement for Excitation Stored in Remote Atomic Ensembles
- Perfect Teleportation and Superdense Coding With W-States
- Non-classical correlations between single photons and phonons from a mechanical oscillator
- Entanglement conditions for two-mode states
- Separability criteria for genuine multiparticle entanglement
- Quantum teleportation via a W state
- Hanbury Brown and Twiss interferometry of single phonons from an optomechanical resonator
- Entanglement witnesses: construction, analysis and classification
- Heralded quantum entanglement between two crystals
- Toolbox for entanglement detection and fidelity estimation
- Scheme for the generation of an entangled four-photon W-state
- Pulsed excitation dynamics of an optomechanical crystal resonator near its quantum ground-state of motion
- Proposal for entangling remote micromechanical oscillators via optical measurements
- Local transformation of two EPR photon pairs into a three-photon W state
- Quantum State Orthogonalization and a Toolset for Quantum Optomechanical Phonon Control
- Phonon counting thermometry of an ultracoherent membrane resonator near its motional ground state
- Three-Photon Discrete-Energy-Entangled W State in Optical Fiber
- Non-Gaussian mechanical motion via single and multi-phonon subtraction from a thermal state
- Quantitative tomography for continuous variable quantum systems
- Preparation and decay of a single quantum of vibration at ambient conditions
- Room-temperature Mechanical Resonator with a Single Added or Subtracted Phonon
- Quantum communication cost of preparing multipartite entanglement
- Entanglement detection under coherent noise: Greenberger-Horne-Zeilinger-like states
- Efficient and robust detection of multipartite Greenberger-Horne-Zeilinger-like states
- Proposal for Observing Nonclassicality in Highly Excited Mechanical Oscillators by Single Photon Detection