Robust and bright polarization-entangled photon sources exploiting non-critical phase matching without periodic poling
arXiv:2409.07673 · doi:10.1364/OE.542612
Abstract
Entangled photon sources are essential for quantum information applications, including quantum computation, quantum communication, and quantum metrology. Periodically poled (PP) crystals are commonly used to generate bright photon sources through quasi-phase matching. However, fabricating uniform micron-scale periodic structures poses significant technical difficulties, typically limiting the crystal thickness to less than a millimeter. Here, we adopt non-critical phase matching to produce a robust and bright polarization-entangled photon source based on a Sagnac interferometer. This method is tolerant of variations in pump incidence angles and temperature, and theoretically offers about a 2.5-fold brightness enhancement compared to quasi-phase matching. Additionally, the absence of periodic poling allows for a larger crystal cross-section. Using a bulk KTP crystal without a PP structure, we experimentally produce the four Bell states with a brightness of 25.1 kHz/mW, achieving purity, concurrence, and fidelity values close to 0.99. We believe our scheme will serve as a key building block for scalable and practical photonic quantum information applications.
7 pages, 5 figures, 2 tables, and supplementary note
References in corpus (26)
- Quantum-enhanced measurements: beating the standard quantum limit
- Review article: Linear optical quantum computing
- Photonic quantum technologies
- On the Measurement of Qubits
- Ultra-bright source of polarization-entangled photons
- Quantum Cryptography with Entangled Photons
- Experimental ten-photon entanglement
- A wavelength-tunable fiber-coupled source of narrowband entangled photons
- Phase-stable source of polarization-entangled photons using a polarization Sagnac interferometer
- Spontaneous parametric down-conversion
- A high-flux source of polarization-entangled photons from a periodically-poled KTP parametric downconverter
- Bright source of spectrally uncorrelated polarization-entangled photons with nearly single-mode emission
- Microscale generation of entangled photons without momentum conservation
- Efficient generation of high-dimensional entanglement through multi-path downconversion
- Tuneable entangled photon pair generation in a liquid crystal
- Introduction to the Absolute Brightness and Number Statistics in Spontaneous Parametric Down-Conversion
- Efficient and pure femtosecond-pulse-length source of polarization-entangled photons
- Pulsed source of spectrally uncorrelated and indistinguishable photons at telecom wavelengths
- Lunar laser ranging in infrfared at hte Grasse laser station
- Satellite-to-Earth Quantum Key Distribution via Orbital Angular Momentum
- Fiber-based photon pair generation: a tutorial
- Non-local temporal interferometry for highly resilient free-space quantum communication
- Quantum communication complexity beyond Bell nonlocality
- Optimized detection of high-dimensional entanglement
- Quantum steering with vector vortex photon states with the detection loophole closed
- A Tunable Transition Metal Dichalcogenide Entangled Photon-Pair Source