High quantum efficiency photon-number-resolving detector for photonic on-chip information processing

We demonstrate a high-efficiency, photon-number resolving transition edge sensor, integrated on an optical silica waveguide structure. The detector consists of three individual absorber/sensor devices providing a total system detection efficiency of up to 93% for single photons at a wavelength of 1551.9 nm. This new design enables high fidelity detection of quantum information processes in on-chip platforms

High-efficiency Bragg grating enhanced on-chip photon-number-resolving detectors

The recent trend towards integration of quantum optics experiments has produced a demand for on-chip single photon detectors with high quantum efficiencies. In previous work we demonstrated integrated photon number resolving detectors for use at telecommunications wavelengths [1], here we outline developments of this design which have enabled improvements in the quantum efficiency, permitting an on-chip detection efficiency of 92% to be obtained in the device of Fig. 1. ..

Multiphoton quantum interference in multiport integrated optical circuits: from teleportation to boson sampling

Building complex quantum systems has the potential to reveal new phenomena that cannot be studied using classical simulation. Photonics has proven to be an effective means to engineer quantum systems of this kind, and for the investigation of such effects. Scaling to large numbers of photons and components for their manipulation is facilitated by the compactness, inherent phase stability and simple alignment afforded by integrated photonic systems

On-chip quantum teleportation

Integrated quantum optics provides great promise for enabling photonic experiments to reach new regimes of complexity. Chip-based fabrication enables sophisticated networks involving multiple interfering pathways in a compact and stable physical architecture. In a recent work [1] we demonstrated an advance in the complexity of these integrated devices by showing the first quantum interference of three separate input photons. Such complexity allows the demonstration of three qubit protocols never before realised on-chip. Here, we report the first results showing quantum teleportation on an integrated photonic circuit. Quantum teleportation provides the mechanism for quantum relay schemes and is an important constituent in linear optical quantum computing. Whilst demonstrations to date have relied upon complex and fragile bulk optical systems, being able to teleport quantum states on a compact and stable integrated architecture will be a critical step towards scalable realisations of these schemes

UV-written silica waveguide devices for integrated quantum optics

We present details of the UV-written silica-on-silicon platform for integrated quantum optics with reference to recent results, and discuss the fabrication challenges involved in scaling to larger experiments

High-birefringence direct UV-written waveguides for use as heralded single-photon sources at telecommunication wavelengths

Direct UV-written waveguides are fabricated in silica-on-silicon with birefringence of (4.9 ± 0.2) × 10−4, much greater than previously reported in this platform. We show that these waveguides are suitable for the generation of heralded single photons at telecommunication wavelengths by spontaneous four-wave mixing. A pulsed pump field at 1060 nm generates pairs of photons in highly detuned, spectrally uncorrelated modes near 1550 nm and 800 nm. Waveguide-to-fiber coupling efficiencies of 78–91 % are achieved for all fields. Waveguide birefringence is controlled through dopant concentration of GeCl4 and BCl3 using the flame hydrolysis deposition process. The technology provides a route towards the scalability of silica-on-silicon integrated components for photonic quantum experiments

Quantum Interference of multiple on-chip heralded sources of pure single photons

We demonstrate the generation of heralded single photons in silica photonic chips with a preparation efficiency of 80% and single photon purity of 0.86. We show multiple indistinguishable photon sources on a single chip with HOM-dip visibilities of up to 95%

Photonic quantum networks

JSAP-OSA Joint Symposia Niigata Japan 14p_C302_1 13-16 Sep Hybrid light-matter networks offer the promise for delivering robust quantum information processing technologies, from sensor arrays to quantum simulators. New sources, detectors and memories illustrate progress towards build a resilient, scalable photonic quantum network

Photonic networked quantum information technologies

Hybrid light-matter networks offer the promise for delivering robust quantum information processing technologies, from sensor arrays to quantum simulators. New sources, detectors and memories illustrate progress towards build a resilient, scalable photonic quantum network