11 research outputs found
A Reconfigurable Quantum Local Area Network Over Deployed Fiber
Practical quantum networking architectures are crucial for scaling the
connection of quantum resources. Yet quantum network testbeds have thus far
underutilized the full capabilities of modern lightwave communications, such as
flexible-grid bandwidth allocation. In this work, we implement flex-grid
entanglement distribution in a deployed network for the first time, connecting
nodes in three distinct campus buildings time-synchronized via the Global
Positioning System (GPS). We quantify the quality of the distributed
polarization entanglement via log-negativity, which offers a generic metric of
link performance in entangled bits per second. After demonstrating successful
entanglement distribution for two allocations of our eight dynamically
reconfigurable channels, we demonstrate remote state preparation -- the first
realization on deployed fiber -- showcasing one possible quantum protocol
enabled by the distributed entanglement network. Our results realize an
advanced paradigm for managing entanglement resources in quantum networks of
ever-increasing complexity and service demands
2022 Roadmap on integrated quantum photonics
AbstractIntegrated photonics will play a key role in quantum systems as they grow from few-qubit prototypes to tens of thousands of qubits. The underlying optical quantum technologies can only be realized through the integration of these components onto quantum photonic integrated circuits (QPICs) with accompanying electronics. In the last decade, remarkable advances in quantum photonic integration have enabled table-top experiments to be scaled down to prototype chips with improvements in efficiency, robustness, and key performance metrics. These advances have enabled integrated quantum photonic technologies combining up to 650 optical and electrical components onto a single chip that are capable of programmable quantum information processing, chip-to-chip networking, hybrid quantum system integration, and high-speed communications. In this roadmap article, we highlight the status, current and future challenges, and emerging technologies in several key research areas in integrated quantum photonics, including photonic platforms, quantum and classical light sources, quantum frequency conversion, integrated detectors, and applications in computing, communications, and sensing. With advances in materials, photonic design architectures, fabrication and integration processes, packaging, and testing and benchmarking, in the next decade we can expect a transition from single- and few-function prototypes to large-scale integration of multi-functional and reconfigurable devices that will have a transformative impact on quantum information science and engineering
Silicon Photonic Microresonator-Based High-Resolution Line-by-Line Pulse Shaping
Optical pulse shaping stands as a formidable technique in ultrafast optics, radio-frequency photonics, and quantum communications. While existing systems rely on bulk optics or integrated platforms with planar waveguide sections for spatial dispersion, they face limitations in achieving finer (few- or sub-GHz) spectrum control. These methods either demand considerable space or suffer from pronounced phase errors and optical losses when assembled to achieve fine resolution. Addressing these challenges, we present a foundry-fabricated six-channel silicon photonic shaper using microresonator filter banks with inline phase control and high spectral resolution. Leveraging existing comb-based spectroscopic techniques, we devise a novel system to mitigate thermal crosstalk and enable the versatile use of our on-chip shaper. Our results demonstrate the shaper's ability to phase-compensate six comb lines at tunable channel spacings of 3, 4, and 5 GHz. Specifically, at a 3 GHz channel spacing, we showcase the generation of arbitrary waveforms in the time domain. This scalable design and control scheme holds promise in meeting future demands for high-precision spectral shaping capabilities
Polarization diversity phase modulator for measuring frequency-bin entanglement of a biphoton frequency comb in a depolarized channel
Quantum frequency combs and Hong–Ou–Mandel interferometry: the role of spectral phase coherence
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Roadmap on Integrated Quantum Photonics
Integrated photonics is at the heart of many classical technologies, from
optical communications to biosensors, LIDAR, and data center fiber
interconnects. There is strong evidence that these integrated technologies will
play a key role in quantum systems as they grow from few-qubit prototypes to
tens of thousands of qubits. The underlying laser and optical quantum
technologies, with the required functionality and performance, can only be
realized through the integration of these components onto quantum photonic
integrated circuits (QPICs) with accompanying electronics. In the last decade,
remarkable advances in quantum photonic integration and a dramatic reduction in
optical losses have enabled benchtop experiments to be scaled down to prototype
chips with improvements in efficiency, robustness, and key performance metrics.
The reduction in size, weight, power, and improvement in stability that will be
enabled by QPICs will play a key role in increasing the degree of complexity
and scale in quantum demonstrations. In the next decade, with sustained
research, development, and investment in the quantum photonic ecosystem (i.e.
PIC-based platforms, devices and circuits, fabrication and integration
processes, packaging, and testing and benchmarking), we will witness the
transition from single- and few-function prototypes to the large-scale
integration of multi-functional and reconfigurable QPICs that will define how
information is processed, stored, transmitted, and utilized for quantum
computing, communications, metrology, and sensing. This roadmap highlights the
current progress in the field of integrated quantum photonics, future
challenges, and advances in science and technology needed to meet these
challenges