John Rarity
580 California St., Suite 400
San Francisco, CA, 94104
Quantum Information Science with Photons on a Chip
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Abstract
Quantum technologies based on photons will likely require integrated optics architectures for improved performance, miniaturization and scalability. We demonstrate high-fidelity silica-on-silicon integrated optical realizations of key quantum photonic circuits and the first integrated quantum algorithm.
Related papers
Integrated Quantum Photonics
IEEE Journal of Selected Topics in Quantum Electronics, 2000
This paper reviews recent advances in integrated waveguide circuits, lithographically fabricated for quantum optics. With the increase in complexity of realizable quantum architectures, the need for stability and high quality nonclassical interference within large optical circuits has become a matter of concern in modern quantum optics. Using integrated waveguide structures, we demonstrate a high performance platform from which to further develop quantum technologies and experimental quantum physics using single photons. We review the performance of directional couplers in Hong-Ou-Mandel experiments, together with inherently stable interferometers with controlled phase shifts for quantum state preparation, manipulation, and measurement as well as demonstrating the first on-chip quantum metrology experiments. These fundamental components of optical quantum circuits are used together to construct integrated linear optical realizations of two-photon quantum controlled logic gates. The high quality quantum mechanical performance observed at the single photon level signifies their central role in future optical quantum technologies.
High-fidelity operation of quantum photonic circuits
Applied Physics Letters, 2010
We demonstrate photonic quantum circuits that operate at the stringent levels that will be required for future quantum information science and technology. These circuits are fabricated from silica-on-silicon waveguides forming directional couplers and interferometers. While our focus is on the operation of quantum circuits, to test this operation required construction of a spectrally tuned photon source to produce near-identical pairs of photons. We show non-classical interference with two photons and a two-photon entangling logic gate that operate with near-unit fidelity. These results are a significant step towards large-scale operation of photonic quantum circuits.
Guest Editorial Integrated Photonics for Quantum Applications
Journal of Lightwave Technology
Guest Editorial Integrated Photonics for Quantum Applications A S GUEST Editors, we are pleased to introduce this Special Issue of the Journal of Lightwave Technology (JLT) on Integrated Photonics for Quantum Applications. This JLT Special Issue covers topics in the field of integrated photonics for emerging quantum applications such as communications, computing, networking, and sensing and aims to provide a global audience with the newest developments in these rapidly evolving fields. Integrated photonics such as fiber or integrated photonic waveguides, quantum light sources, detectors, and others are considered key to miniaturize bulky bench-top experiments down to chip-level and integrate them into larger systems, achieving essential improvements in performance and practical deployment for the various quantum applications. With this first Special Issue of JLT on this topic, we are delighted to have captured the latest state of the art of Integrated Photonics for Quantum Applications, bringing closer two communities that can greatly benefit from each other: the classical optical communications and the quantum. This Special Issue hosts 17 papers, including two invited papers and three tutorial papers. The papers cover several hot topics in integrated photonics for quantum applications, among which, the following are particularly worthy of mention: integrated quantum key distribution and quantum random noise generation photonic technologies, on-chip quantum communication devices, nonlinear quantum photonics with AlGaAs Bragg-reflection waveguides, diamond integrated quantum nanophotonics, and superconducting singlephoton and photon-number resolving detectors. We take advantage of this Editorial to thank all those who have made the publication of this Special Issue possible: all the esteemed authors of the several submitted papers, the voluntary expert reviewers, and the editorial team at JLT. We believe this Special Issue will captivate the readers that are already experts in the field of integrated quantum photonics, as well as stimulate the interest of newcomers in using the potential of photonics to the benefit of several quantum applications.
Large-scale Integration of Multidimensional Quantum Photonics Circuits on Silicon
Conference on Lasers and Electro-Optics, 2018
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Supporting quantum technologies with a micron-scale silicon photonics platform
Integrated Optics: Devices, Materials, and Technologies XXVI, 2022
VTT micron-scale silicon photonics platform can play a significant role in the second quantum revolution, supporting not only quantum photonics but also solid-state quantum systems. Quantum photonics can benefit from the unique properties of the platform, a distinctive example application being quantum key distribution, where we are developing receivers to support its large-scale deployment. On the other hand, we are using our photonic integration technology also to aid scalingup superconducting quantum computers, by controlling and reading the qubits in the cryostat through classical optical links. I will cover all these developments showing our recent results, ongoing activities, and future plans.
On-Chip Single-Photon Sifter
Quantum states of light play a pivotal role in modern science and future photonic applications. While impressive progress has been made in their generation and manipulation with high fidelities, the common table-top approach is reaching its limits for practical quantum applications. Since the advent of integrated quantum nanophotonics different material platforms based on III-V nanostructures-, color centers-, and nonlinear waveguides[4-8] as on-chip light sources have been investigated. Each platform has unique advantages and limitations in terms of source properties, optical circuit complexity, and scaling potentials. However, all implementations face major challenges with efficient and tunable filtering of individual quantum states, scalable integration and deterministic multiplexing of on-demand selected quantum emitters, and on-chip excitation-suppression. Here we overcome all of these challenges with a novel hybrid and scalable nanofabrication approach to generate quantum light on-chip, where selected single III-V quantum emitters are positioned and deterministically integrated in a CMOS compatible circuit with controlled on-chip filtering and excitation-suppression.Furthermore, we demonstrate novel on-chip quantum wavelength division multiplexing, showing tunable routing of single-photons. Our reconfigurable quantum photonic circuits with a foot print one million times smaller than similar table-top approaches, offering outstanding excitation suppression of more than 95 dB and efficient routing of single photons over a bandwidth of 40 nm, are essential to unleash integrated quantum optical technologies full potential.
Silicon photonic quantum computing with spin qubits
APL Photonics, 2021
Paper published as part of the special topic on Integrated Quantum Photonics ARTICLES YOU MAY BE INTERESTED IN Why I am optimistic about the silicon-photonic route to quantum computing APL Photonics 2, 030901 (2017);
A nanophotonic platform for quantum optical integrated circuits
2019
The evolution of the field of computing from electromechanical relay to vacuum tubes, electronic transistors and finally integrated circuits, where billions of transistors can be packed into a single chip, has exponentially sped up the power of information processing. As the age of miniaturization of semiconductor electronic devices is getting closer to the end, new opportunities appear with quantum computing that are not available in the paradigm of classical integrated circuits. This thesis explores new avenues for the implementation of nanoscale functional quantum devices by development of material platforms and nanofabrication techniques for monolithic integration of quantum light sources in chip-based optical circuitry. First, a top-down nanofabrication technique is developed for deterministic coupling of individual quantum emitters (QEs) into plasmonic waveguide modes. Secondly, a nanophotonic platform based on dielectric-loaded surface plasmon polariton waveguides (DLSPPWs) i...
Nanophotonic approaches for integrated quantum photonics
arXiv: Quantum Physics, 2019
Photons for quantum technologies have been identified early on as a very good candidate for carrying quantum information encoded onto them, either by polarization encoding, time encoding or spatial encoding. Quantum cryptography, quantum communications, quantum networks in general and quantum computing are some of the applications targeted by what is now called quantum photonics. Nevertheless, it was pretty clear at an early stage that bulk optics for handling quantum states of light with photons would not be able to deliver what is needed for these technologies. More recently, single photons, entangled photons and quantum optics in general have been coupled to more integrated approaches coming from classical optics in order to meet the requirements of scalability, reliablility and efficiency for quantum technologies. In this article, we develop our recent advances in two different nanophotonic platforms for quantum photonics using elongated optical fibers and integrated glass waveg...
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