Witnessing trustworthy single-photon entanglement with local homodyne measurements
arXiv:1206.5734 · doi:10.1103/PhysRevLett.110.130401
Abstract
Single-photon entangled states, i.e. states describing two optical paths sharing a single photon, constitute the simplest form of entanglement. Yet they provide a valuable resource in quantum information science. Specifically, they lie at the heart of quantum networks, as they can be used for quantum teleportation, swapped and purified with linear optics. The main drawback of such entanglement is the difficulty in measuring it. Here, we present and experimentally test an entanglement witness allowing one not only to say whether a given state is path-entangled but also that entanglement lies in the subspace where the optical paths are each filled with one photon at most, i.e. refers to single-photon entanglement. It uses local homodyning only and relies on no assumption about the Hilbert space dimension of the measured system. Our work provides a simple and trustful method for verifying the proper functioning of future quantum networks.
published version
References in corpus (9)
- The Quantum Internet
- Entanglement detection
- An Elementary Quantum Network of Single Atoms in Optical Cavities
- Quantum Repeaters with Photon Pair Sources and Multi-Mode Memories
- Mapping photonic entanglement into and out of a quantum memory
- Experimental demonstration of a BDCZ quantum repeater node
- A computable measure of nonclassicality for light
- Field test of a continuous-variable quantum key distribution prototype
- A high-fidelity single-photon source based on a type-II optical parametric oscillator
Cited by in corpus (24)
- Optical synthesis of large-amplitude squeezed coherent-state superpositions with minimal resources
- Experimental Proof of Nonlocal Wavefunction Collapse for a Single Particle Using Homodyne Measurement
- Analog of the Clauser-Horne-Shimony-Holt inequality for steering
- Connecting heterogeneous quantum networks by hybrid entanglement swapping
- Efficient reversible entanglement transfer between light and quantum memories
- Quantum state engineering by click counting
- High-efficiency WSi superconducting nanowire single-photon detectors for quantum state engineering in the near infrared
- Observing optical coherence across Fock layers with weak-field homodyne detectors
- Revealing Genuine Optical-Path Entanglement
- Single-photon nonlocality in quantum networks
- Can single photon excitation of two spatially separated modes lead to a violation of Bell inequality via homodyne measurements?
- Two-photon amplitude interferometry for precision astrometry
- Quantum weak coin flipping with a single photon
- Optimal interferometry for Bellnonclassicality by a vacuumonephoton qubit
- Maximal coin-walker entanglement in a ballistic quantum walk
- Single-photon quantum nonlocality: Violation of the Clauser-Horne-Shimony-Holt inequality using feasible measurement setups
- Experimental Fock-State Bunching Capability of Non-Ideal Single-Photon States
- Witnessing single-photon entanglement with local homodyne measurements: analytical bounds and robustness to losses
- Local and scalable detection of genuine multipartite single-photon path entanglement
- Generation and entanglement study of generalized N-mode single photon perfect W-states
- Implementable Hybrid Entanglement Witness
- Two-mode light states before and after delocalized single-photon addition
- Continuous Variable Quantum Advantages and Applications in Quantum Optics
- Divide-and-Conquer: An integrated photon-counting scheme