Dr Jonathan C F Matthews

MSci(Bristol), PhD, MSc(Bristol), MSc(Bristol), PhD(Bristol)

  • BS8 1TL

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Research interests

Quantum metrology. From photography to the ultra-precise iterferometers used to detect gravitational waves, light has proven to be a fansatstic way to quantify our surroundings. Quantum mechanics defines the limit in quality of optical measurements. For example, the precision that laser interferometers can measure subtle changes in distance is limited by shot noise. By careful engineering of quantum properties of light — e.g. single photons, entanglement and squeezing — we know that we can surpase previously understood "limits" in precision measurement. Such quantum-enhanced techniques in optical measurement have the potential to impact whenever precision measurement with light is deployed, from healthcare to precision manufacture. And underpinning such proposals is some really interesting physics and fantastic challenges in optics and photonics engineering. Recently, we explored using single photons to perform sub shot noise absorption spectroscopy, applied to descriminate Haemoglobin samples: New J. Phys. 19 023013 (2017).

Quantum Walks. The random walk has proven to be a useful model for computational physics. Perhaps most famously exemplified by the "druken sailor" or Galton's board, the general random walk describes stochastic motion of particles around a descretised space, giving rise to descriptions of e.g. Brownian motion and population genetics. The quantum mechanical analogue of this idea is the "quantum walk" — here the particles still move around a discretised space, but can move in superposition giving rise to vastly different dynamics to its classical counterpart due to wave-like intereference. Many different types of quantum walk have been devised and can be found in the literature. Their applications include use as a model for coherent transport in other quantum systems, as an approach to forms of quantum computation and as an aid to proving approaches to universal quatnaum computation (when e.g. nonlinearities are included). My work in this area has focused on optical implementations of quantum walks, including most recently simulation with a primitive optical quantum processor: Nature Communications 7, Article number: 11511 (2016).

Structured keywords and research groupings

  • Bristol Quantum Information Institute
  • QETLabs

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