A Flexible Source of Non-Degenerate Entangled Photons Based on a Two-Crystal Sagnac Interferometer
arXiv:1305.0986 · doi:10.1103/PhysRevA.88.012301
Abstract
Sources of entangled photon pairs are a key component in both fundamental tests of quantum theory and practical applications such as quantum key distribution and quantum computing. In this work, we describe and characterize a source of polarization entangled photon pairs based on two spontaneous parametric down-conversion (SPDC) crystals in a Sagnac interferometer. Our source is compact and produces high-quality entangled states in a very flexible manner. The wavelengths of the photon pairs, around 810 and 1550 nm, the phase between orthogonal components of the entangled state, and the tangle of the state are all independently adjustable. In addition to presenting basic characterization data, we present experimental violations of CHSH and Leggett inequalities, as well as an instance of the "beautiful" Bell inequality, which has not previously been tested experimentally.
10 pages, 8 figures
References in corpus (4)
Cited by in corpus (8)
- Heralded single-photon source utilizing highly nondegenerate, spectrally factorable spontaneous parametric downconversion
- Polarization-entangled photon-pair source obtained via type-II non-collinear SPDC process with PPKTP crystal
- Fully guided-wave photon pair source for quantum applications
- Device-dependent and device-independent quantum key distribution without a shared reference frame
- Approaching the Tsirelson bound with a Sagnac source of polarization-entangled photons
- A folded-sandwich polarization-entangled two-color photon pair source with large tuning capability for applications in hybrid quantum architectures
- General and complete description of temporal photon correlations in cavity-enhanced spontaneous parametric down-conversion
- Compact non-degenerate entangled-photon source and near-infrared-to-telecom quantum teleportation