Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Optics Express

Entanglement measurement of a coupled silicon microring photon pair source

Ranjeet Kumar, Marc Savanier, Jun Rong Ong, Shayan Mookherjea

Published Jul 16, 2015• 59 citations
Publisher

Abstract

Using two-photon (Franson) interferometry, we measure the entanglement of photon pairs generated from an optically-pumped silicon photonic device consisting of a few coupled microring resonators. The pair-source chip operates at room temperature, and the InGaAs single-photon avalanche detectors (SPADs) are thermo-electrically cooled to 234K. Such a device can be integrated with other components for practical entangled photon-pair generation at telecommunications wavelengths.

DOI
10.1364/oe.23.019318

Related papers

Joint Spectral Intensity of 1.55 μm photon-pairs generated by Si microrings

Shayan Mookherjea, Marc Savanier, Nikhil Mathur

The two-photon spectrum of photon pairs generated at room-temperature in optically-pumped silicon microrings was measured using tunable filters, InGaAs single-photon avalanche detectors and deconvolution, and an image-processing artifact-reduction algorithm is discussed.

Conference on Lasers and Electro-Optics•Jan 1, 2017•0 citations

Micrometer-scale integrated silicon source of time-energy entangled photons

Davide Grassani, Stefano Azzini, Marco Liscidini +5 more

Entanglement is a fundamental resource in quantum information processing. Several studies have explored the integration of sources of entangled states on a silicon chip, but the devices demonstrated so far require millimeter lengths and pump powers of the order of hundreds of milliwatts to produce an appreciable photon flux, hindering their scalability and dense integration. Microring resonators have been shown to be efficient sources of photon pairs, but entangled state emission has never been proven in these devices. Here we report the first demonstration, to the best of our knowledge, of a microring resonator capable of emitting time-energy entangled photons. We use a Franson experiment to show a violation of Bell’s inequality by more than seven standard deviations with an internal pair generation exceeding 107 Hz. The source is integrated on a silicon chip, operates at milliwatt and submilliwatt pump power, emits in the telecom band, and outputs into a photonic waveguide. These are all essential features of an entangled state emitter for a quantum photonic network.

Optica•Jan 26, 2015•263 citations

Simultaneous dual-band entangled photon pair generation using a silicon photonic microring resonator

Chaoxuan Ma, Shayan Mookherjea

Traditional entangled photon pair generation apparatus, such as periodically-poled nonlinear crystals or microstructured fibers, require special and complex device structures to permit spontaneous nonlinear interactions at different wavelengths to occur simultaneously. This makes it difficult to design a single device that can, for example, generate high-quality, high-brightness photon pairs at both the 1310 and 1550 nm wavelength bands. Such flexibility will be useful in reconfiguring quantum communications to co-exist with data and telecommunications networks in popular use today. We show that a simple, appropriately-designed silicon microring device can achieve this objective, and explain the design and measurements of photon pair generation including coincidences-to-accidentals ratio and Franson interferometry of energy–time entanglement.

Quantum Science and Technology•Mar 22, 2018•13 citations

A micrometer-scale integrated silicon source of time-energy entangled photons

Davide Grassani, Stefano Azzini, Marco Liscidini +5 more

Entanglement is a fundamental resource in quantum information processing. Several studies have explored the integration of sources of entangled states on a silicon chip but the sources demonstrated so far require millimeter lengths and pump powers of the order of hundreds of mWs to produce an appreciable photon flux, hindering their scalability and dense integration. Microring resonators have been shown to be efficient sources of photon pairs, but entangled state emission has never been demonstrated. Here we report the first demonstration of a microring resonator capable of emitting time-energy entangled photons. We use a Franson experiment to show a violation of Bell's inequality by as much as 11 standard deviations. The source is integrated on a silicon chip, operates at sub-mW pump power, emits in the telecom band with a pair generation rate exceeding 10$^7$ Hz per $nm$, and outputs into a photonic waveguide. These are all essential features of an entangled states emitter for a quantum photonic networks.

arXiv:1409.4881•Sep 17, 2014•3 citations

Photon Pair Generation Using Silicon Photonic Microring and Hybrid Laser

Xiaoxi Wang, Chaoxuan Ma, Ranjeet Kumar +4 more

Using all silicon photonic components, including an electrically-pumped hybrid silicon laser and a high-Q ring resonator, photon pairs with non-classical correlations were generated at room temperature near 1310 nm wavelengths.

Conference on Lasers and Electro-Optics•Jan 1, 2017•4 citations

Photon Pairs from a Silicon Photonic Chip

Ranjeet Kumar

Photon pair sources with the capability to tune the wavelength and correlation properties of the generated photons can be useful for quantum applications such as communication, sensing, and computing. Silicon devices based on the SOI (silicon-on-insulator) platform benefits from both tight modal confinement, due to high index contrast between core and cladding, and CMOS compatible manufacturing process, making it a suitable platform for such sources. In the present work, we discuss the possibility of using planar resonant silicon devices with bend radii of a few tens of microns as photon pair sources. We discuss that a silicon nanophotonic chip consisting of either a single microring or coupled microrings can be used to generate photon pairs around 1.55 um. We discuss that the photons are generated in multiple pairs of wavelengths and can be tuned over several nanometers, demonstrating the capability to generate wavelength division multiplexed photon pairs at freely chosen telecommunication-band wavelengths. Further on, we discuss the ease of control over the bi-photon spectrum of the generated photon pairs and its implication in controlling their correlation properties. Uncorrelated photon pairs can be used to herald a single photon, and correlated photon pairs can be used in various quantum applications such as communication and sensing. In the end, we discuss the design parameters of a single microring resonator based sources.

•Jan 1, 2016•0 citations
Using two-photon (Franson) interferometry, we measure the entanglement of photon pairs generated from an optically-pumped silicon photonic device consisting of a few coupled microring resonators. The pair-source chip operates at room temperature, and the InGaAs single-photon avalanche detectors (SPADs) are thermo-electrically cooled to 234K. Such a device can be integrated with other components for practical entangled photon-pair generation at telecommunications wavelengths.
Entanglement is a fundamental resource in quantum information processing. Several studies have explored the integration of sources of entangled states on a silicon chip, but the devices demonstrated so far require millimeter lengths and pump powers of the order of hundreds of milliwatts to produce an appreciable photon flux, hindering their scalability and dense integration. Microring resonators have been shown to be efficient sources of photon pairs, but entangled state emission has never been proven in these devices. Here we report the first demonstration, to the best of our knowledge, of a microring resonator capable of emitting time-energy entangled photons. We use a Franson experiment to show a violation of Bell’s inequality by more than seven standard deviations with an internal pair generation exceeding 107 Hz. The source is integrated on a silicon chip, operates at milliwatt and submilliwatt pump power, emits in the telecom band, and outputs into a photonic waveguide. These are all essential features of an entangled state emitter for a quantum photonic network.
Traditional entangled photon pair generation apparatus, such as periodically-poled nonlinear crystals or microstructured fibers, require special and complex device structures to permit spontaneous nonlinear interactions at different wavelengths to occur simultaneously. This makes it difficult to design a single device that can, for example, generate high-quality, high-brightness photon pairs at both the 1310 and 1550 nm wavelength bands. Such flexibility will be useful in reconfiguring quantum communications to co-exist with data and telecommunications networks in popular use today. We show that a simple, appropriately-designed silicon microring device can achieve this objective, and explain the design and measurements of photon pair generation including coincidences-to-accidentals ratio and Franson interferometry of energy–time entanglement.
Entanglement is a fundamental resource in quantum information processing. Several studies have explored the integration of sources of entangled states on a silicon chip but the sources demonstrated so far require millimeter lengths and pump powers of the order of hundreds of mWs to produce an appreciable photon flux, hindering their scalability and dense integration. Microring resonators have been shown to be efficient sources of photon pairs, but entangled state emission has never been demonstrated. Here we report the first demonstration of a microring resonator capable of emitting time-energy entangled photons. We use a Franson experiment to show a violation of Bell's inequality by as much as 11 standard deviations. The source is integrated on a silicon chip, operates at sub-mW pump power, emits in the telecom band with a pair generation rate exceeding 107^77 Hz per nmnmnm, and outputs into a photonic waveguide. These are all essential features of an entangled states emitter for a quantum photonic networks.
Photon pair sources with the capability to tune the wavelength and correlation properties of the generated photons can be useful for quantum applications such as communication, sensing, and computing. Silicon devices based on the SOI (silicon-on-insulator) platform benefits from both tight modal confinement, due to high index contrast between core and cladding, and CMOS compatible manufacturing process, making it a suitable platform for such sources. In the present work, we discuss the possibility of using planar resonant silicon devices with bend radii of a few tens of microns as photon pair sources. We discuss that a silicon nanophotonic chip consisting of either a single microring or coupled microrings can be used to generate photon pairs around 1.55 um. We discuss that the photons are generated in multiple pairs of wavelengths and can be tuned over several nanometers, demonstrating the capability to generate wavelength division multiplexed photon pairs at freely chosen telecommunication-band wavelengths. Further on, we discuss the ease of control over the bi-photon spectrum of the generated photon pairs and its implication in controlling their correlation properties. Uncorrelated photon pairs can be used to herald a single photon, and correlated photon pairs can be used in various quantum applications such as communication and sensing. In the end, we discuss the design parameters of a single microring resonator based sources.