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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.
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...
We demonstrate sub-shot-noise spectroscopy, near to the ultimate quantum limit. We use heralded single photons as the optical probe and compare using single photon detectors and a CCD to demonstrate sub-shot-noise performance.
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 demonstrate pseudorandom optical processes known as t-designs, showing that for t =1(2) they are statistically indistinguishable from random operations for 1(2)-photon quantum interference, and that they fail to mimic randomness for 2(3)-photon interference.
A novel scheme for unitary quantum process tomography (QPT) is theoretically presented and implemented experimentally. Multi-photon input states are used to obtain quantum-enhanced precision for the unitary estimation. Our results are compared to standard QPT.
Integrated photonics is required to fully exploit the capabilities of Optical Quantum Information science. We demonstrate new components that take full advantage of the integrated architecture; we show quantum interference in MMI couplers and two-particle quantum walks in coupled waveguides.
Quantum information science has shown that harnessing quantum mechanical effects can dramatically improve performance for certain tasks in communication, computation and measurement. Of the various physical systems being pursued, single particles of light - photons - are often the logical choice [1]. In addition to single photon sources and detectors, photonic quantum technologies will rely on sophisticated...
Optical quantum technologies require new photonic components to exploit integrated architecture. We demonstrate quantum interference in MMI couplers and coupled waveguides that implement two-particle quantum walks, showing unique quantum behaviour.
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.
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.
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