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We report a 4-photon measurement in silicon-on-isolator, demonstrating 67.31% ± 10% indistinguishability among heralded photons generated from two separate micro-resonators, and interfered on-chip. The heralded single-photon purities from each source are estimated as 86.20 ± 3.89% and 78.69 ± 2.44%.
Here we present the first quantum homodyne detector on a silicon chip. We demonstrate all of the characteristics required for detection of quantum states: high speed, signal-to-noise ratio, and common-mode rejection ratio.
We determine the nonlinear coefficient of a silicon wire waveguide from room temperature down to 3.8K. Measurements are taken of the self-phase modulation and two-photon absorption.
We model photon-pair generation in the presence of parasitic nonlinearities such as self- and cross-phase modulation. The effect of these nonlinearities on the pair production rate and heralded photon purity is explored.
Quantum photonic technologies have the potential to revolutionise our information and communication systems, enabling ultra-secure communication and advanced computation with applications in quantum simulation and machine learning. Here we overview the potential of silicon photonics to realise such a technology platform.
The homodyne detector is a primitive element in many quantum optics experiments. It is primarily a characterization device, used for measuring the quantum state of the electromagnetic field[1]. Quantum integrated photonics[2], in which optical sources, circuits, and detectors are monolithically integrated on a semi-conductor chip, provides a compact, scalable, platform in which to implement quantum...
The efficient characterization and validation of the underlying model of a quantum physical system is a central challenge in the development of quantum devices and for our understanding of foundational quantum physics. However, the impossibility to efficiently predict the behaviour of complex quantum models on classical machines makes this challenge to be intractable to classical approaches. Quantum...
We present the analysis of a single photon detector system capable of achieving near-unity detection efficiency. It consist of waveguide-coupled superconducting nanowires as short as 1 μm embedded in a racetrack resonator.
We demonstrate the generation of correlated photon pairs and pump rejection across two Silicon-on-Insulator photonic integrated circuits. Incoherently cascaded lattice filters are used to provide over 100 dB pump extinction with a CAR of 2.4.
We present an analysis of a single photon detector system capable of achieving near-unity detection efficiency. It consist of waveguide-coupled superconducting nanowires as short as 1 μm embedded in a racetrack resonator.
We demonstrate a fully integrated photonic transmitter for time-bin based multi-protocol quantum key distribution. This GHz rate Indium Phosphide device prepares states for Coherent One Way (COW), Differential Phase Shift (DPS), and BB84 protocols.
Electrical switching of the orbital angular momentum (OAM) mode order emitted from an SOI microring resonator is reported. The integration of the microring with waveguide couplers is used to demonstrate modulation of the relative phase between pairs of OAM modes with opposite signs.
Fast tuning of the Optical Angular Momentum (OAM) order of a vortex beam is demonstrated with 20µs switching times using a compact silicon photonic device.
On-chip electrical modulation of relative phase between pairs of optical vortices with opposite signs has been demonstrated, enabling useful functions in lab-on-chip, communications and sensing applications.
We develop techniques to verify the computational complexity of a class of analogue quantum computers known as boson samplers. We demonstrate these techniques with up to 5 photons in two different types of integrated linear optical circuit, observing Hilbert spaces of up to 50,000 dimensions.
We present a silicon-on-insulator quantum photonic device able to generate and analyze two maximally entangled qubits. Quantum interference between resonant four-wave mixing sources, phase-stable frequency-selection, and quantum state tomography are shown.
We report on a quantum key distribution (QKD) experiment where a client with an on-chip polarisation rotator can access a server through a telecom-fibre link. Large resources such as photon source and detectors are situated at server-side. We employ a reference frame independent QKD protocol for polarisation qubits and show that it overcomes detrimental effects of drifting fibre birefringence in a...
We report the first on-chip quantum interference between photons generated in two discrete spontaneous four-wave mixing sources, and the manipulation of this biphotonic state using silicon-on-insulator integrated optics.
Quantum photonics is a promising technology for implementing quantum information tasks. We demonstrate integration of multiple photon pair sources together with a circuit enabling creation and manipulation of photon pairs in a monolithic silicon-on-insulator chip.
Elementary components required for photonic quantum information processing are realised in a silicon-on-insulator platform. On-chip quantum interference, manipulation of entangled states and photon-pair generation in a ring resonator with record high coincidental-to-accidental rates are demonstrated.
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