Linear optics schemes for entanglement distribution with realistic single-photon sources
arXiv:1405.3999 · doi:10.1103/PhysRevA.90.033836
Abstract
We study the operation of linear optics schemes for entanglement distribution based on nonlocal photon subtraction when input states, produced by imperfect single-photon sources, exhibit both vacuum and multiphoton contributions. Two models for realistic photon statistics with radically different properties of the multiphoton "tail" are considered. The first model assumes occasional emission of double photons and linear attenuation, while the second one is motivated by heralded sources utilizing spontaneous parametric down-conversion. We find conditions for the photon statistics that guarantee generation of entanglement in the relevant qubit subspaces and compare it with classicality criteria. We also quantify the amount of entanglement that can be produced with imperfect single-photon sources, optimized over setup parameters, using as a measure entanglement of formation. Finally, we discuss verification of the generated entanglement by testing Bell's inequalities. The analysis is carried out for two schemes. The first one is the well-established one-photon scheme, which produces a photon in a delocalized superposition state between two nodes, each of them fed with one single photon at the input. As the second scheme, we introduce and analyze a linear-optics analog of the robust scheme based on interfering two Stokes photons emitted by atomic ensembles, which does not require phase stability between the nodes.
arXiv comment12 pages, 7 figures, title change, minor corrections in the text
References in corpus (26)
- Quantum entanglement
- Quantum Cryptography
- Entanglement of Formation of an Arbitrary State of Two Qubits
- Separability Criterion for Density Matrices
- The Security of Practical Quantum Key Distribution
- Separability of Mixed States: Necessary and Sufficient Conditions
- Long-distance quantum communication with atomic ensembles and linear optics
- Entanglement of a Pair of Quantum Bits
- Review: Semiconductor Quantum Light Sources
- Quantum Repeaters with Photon Pair Sources and Multi-Mode Memories
- Schroedinger cat-like states by conditional measurements on a beam-splitter
- Direct Probing of Quantum Phase Space by Photon Counting
- Quantum Nonlocality in Phase Space
- Tailoring Single and Multiphoton Probabilities of a Single Photon On-Demand Source
- Integrated spatial multiplexing of heralded single photon sources
- Long-Distance Entanglement Distribution with Single-Photon Sources
- Robust creation of entanglement between remote memory qubits
- Bosonic Quantum Codes for Amplitude Damping
- Recent developments in photon-level operations on travelling light fields
- Robust and Efficient Quantum Repeaters with Atomic Ensembles and Linear Optics
- Nonclassicality of a photon-subtracted Gaussian field
- A fast and robust approach to long-distance quantum communication with atomic ensembles
- Fault-tolerant quantum repeater with atomic ensembles and linear optics
- Detector imperfections in photon-pair source characterization
- Protecting an optical qubit against photon loss
- NONLOCALITY OF A SINGLE PHOTON REVISITED AGAIN
Cited by in corpus (4)
- Device-independent quantum secure direct communication with single photon sources
- Device-independent quantum key distribution with single-photon sources
- Sculpting out quantum correlations with bosonic subtraction
- Heralded optical entanglement distribution via lossy quantum channels: A comparative study