An Efficient Integrated Two-Color Source for Heralded Single Photons
arXiv:1211.3960 · doi:10.1088/1367-2630/15/3/033010
Abstract
We present a pulsed and integrated, highly non-degenerate parametric downconversion (PDC) source of heralded single photons at telecom wavelengths, paired with heralding photons around 800 nm. The active PDC section is combined with a passive, integrated wavelength division demultiplexer on-chip, which allows for the spatial separation of signal and idler photons with efficiencies of more than 96.5 %, as well as with multi-band reflection and anti-reflection coatings which facilitate low incoupling losses and a pump suppression at the output of the device of more than 99 %. Our device is capable of preparing single photons with efficiencies of 60 % with a coincidences-to-accidentals ratio exceeding 7400. Likewise it shows practically no significant background noise compared to continuous wave realizations. For low pump powers, we measure a conditioned second-order correlation function of g^(2)(0)=0.0038, which proves almost pure single photon generation. In addition, our source can feature a high brightness of <n_pulse>=0.24 generated photon pairs per pump pulse at pump power levels below 100 uW. The high quality of the pulsed PDC process in conjunction with the integration of highly efficient passive elements makes our device a promising candidate for future quantum networking applications, where an efficient miniaturization plays a crucial role.
17 pages, 16 figures
References in corpus (12)
- Hacking commercial quantum cryptography systems by tailored bright illumination
- Silica-on-Silicon Waveguide Quantum Circuits
- Heralded Generation of Ultrafast Single Photons in Pure Quantum States
- Manipulating multi-photon entanglement in waveguide quantum circuits
- Photon number resolution using a time-multiplexed single-photon detector
- High quality asynchronous heralded single photon source at telecom wavelength
- Multimode quantum interference of photons in multiport integrated devices
- A high-brightness source of polarization-entangled photons optimized for applications in free space
- Passive decoy state quantum key distribution: Closing the gap to perfect sources
- An extremely low-noise heralded single-photon source: a breakthrough for quantum technologies
- Characterization of the non-classical nature of conditionally prepared single photons
- High-quality polarization entanglement state preparation and manipulation in standard telecommunication channels