Quantum in the Crowd

TU Delft and KTH's Val Zwiller opens day three of BQIT Bristol awoke in a thick fog on Friday morning, but by the time the first session was in full swing, we were back under the glorious BQIT sunshine, looking down on the harbourside from our venue, MShed. Kicking off the day was Val Zwiller of TU Delft & KTH Stockholm, giving a history and outlook for superconducting nanowire single photon detectors (SNSPDS), with an emphasis on the importance of time resolution - photon purity will appear much reduced if measured without appropriate time resolution! QET Labs' Dondu Sahin followed up with Bristol's plans for near unity efficiency, ring-coupled SNSPDs, which have the added bonus of precise wavelength tunability, and Anthony Laing (also from QET Labs), with his talk on photonic simulations of molecular quantum dynamics. In the next session, "Quantum Communications and Networks", Xiao Yuan presented University of Oxford's latest quantum algorithm...

QTEC's Andy Collins opens the second day of BQIT with his industry session talk The second day of the Bristol Quantum Information Technologies Workshop was yet another day of golden sunshine and intriguing discussions. Talks ranged from industry perspectives and future funding to solid state systems and quantum dots, as well as a poster session generously sponsored by KETS covering broad directions of academic research. The morning proceedings began with talks on industry activity over the past year. Andrew Collins from the University of Bristol's Quantum Technology and Enterprise Centre (QTEC) spoke about some of the highs and lows of quantum startups, busting some myths and ending with a call for people to take part in the upcoming Quantum Start Up Week this July. Next was Zurich Instruments' Jelena Trbovic, highlighting how their amplifiers and arbitrary waveform generators can be used for fast characterising and control of superconducting qubits. And before brea...

QET Labs' director John Rarity opens the 2018 BQIT workshop In accordance with the precedent set last year, the Bristol Quantum Information Technologies Workshop kicked off today at the M Shed with the start of what is forecast to be three days of glorious sunshine. The weather was matched by optimism in the days talks, which were spread over sessions in quantum communications, quantum theory, quantum photonics and quantum enhanced measurement and control. QET Labs director John Rarity opened the conference and gave the first talk "next generation communication networks", summarising QET Labs’ activity in the area. Chip scale QKD pioneered by KETS - a recent Bristol spin-out - was a highlight, as well as plans for a sub £1M QKD satellite mission. Next up, Christoph Marquardt of the Max Planck Institute of the Science of Light reviewed the state of QKD around the world, and outlined their plans to build global hybrid QKD networks, utilising satellites, drones, and f...

Almut Beige (University of Leeds) and her talk "from optical cavities to cavity-fibre networks" BQIT:17's third and final day saw the workshop draw to a close with another sunny day of talks on detectors, hybrid platforms and integrated photonics. Kicking things off was Sae Woo Nam from NIST. Sae Woo explained two projects around the subject of superconducting nanowire single photon detectors (SNSPDs): one which showed a detection efficiency when used in practice of over 93%, and another on SNSPDs integrated into waveguides. He finished talking about some work with Dave Wineland integrating these detectors with ion traps. University of Münster's Wolfram Pernice followed this by speaking about developing SNSPDs which are capable of detecting single photons in plane, making them suitable for waveguides. The first solid state & hybrid systems session began with Almut Beige from the University of Leeds, who explained how we can better understand how to couple...

Our BQIT student helpers (left to right) Jorge Monroy Ruz, Caterina Vigliar and Ben Slater Day 2 of QET Labs' fourth annual Bristol Quantum Information Technologies (BQIT) saw another sunny day of talks related to quantum technologies. The quantum information theory stream kicked off with the University of Bristol's Ashley Montanaro, detailing two recent algorithms to provide quadratic speedups for backtracking and Monte Carlo methods. This was followed by Ulm University's Martin Plenio, who talked about efficient ways of performing quantum state tomography, resulting in being able to experimentally demonstrate efficient state tomography for 20 trapped ions. Laura Mancinska, also of the University of Bristol, concluded this topic with a talk on how to verify that a state you are given is entangled. A coffee break precluded Winfried Hensinger of the University of Sussex, who began the scaling up theme by explaining the background of ion trap quantum computing, befor...

This year's BQIT workshop was hosted at the M Shed on Bristol's harbourside. The first day of QET Labs' fourth annual Bristol Quantum Information Technologies (BQIT) Workshop kicked off with a whistle-stop tour of quantum technologies, ranging from the foundations of entanglement to the quantum industry. For entanglement foundations, first to speak was University of Toronto's Aephraim Steinberg, highlighting two recent results: how quantum-enhanced sensing can beat "Rayleigh's curse" and strongly increase nonlinear optical effects. He was followed by Marek Żukowski from the University of Gdańsk, who explained how redefining Stokes parameters can lead to better entanglement observations. The devices segment began with Josh Nunn from the University of Oxford unveiling a long awaited result: A noise free quantum memory! University of Pavia's Marco Liscidini followed this with his proposal for a ring resonator with 99.9% purity. Our first inform...