BQIT:18 - Day Three

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 "imaginary time variational quantum simulation", which promises to find global minima with increased probability, expediting quantum optimisation. Before breaking for lunch, Eleni Diamanti (CNRS, Sorbonne Universite) expounded on the practical challenges of engineering real, effective quantum cryptography networks.

Sir Peter Knight (NPL) kicks off the afternoon theory session

After some discussions and catch-ups at lunch, we returned to the auditorium for the "Quantum Theory" session. The erudite Sir Peter Knight (NPL) took to the floor with an extremely entertaining talk to disprove two no-go theorems, showing that the nondestructive detection of a single optical photon is indeed possible---now the race is on to do it in practice! To follow, Pieter Kok (University of Sheffield) demonstrated novel imaging techniques to get the most maximal amount of information when imaging black bodies. To finish the session, Sam Pallister of the University of Bristol gave a fantastically didactic talk on the optimal verification of quantum states.

The final session concluded the theory topic and led into talks on imaging. Irene D'Amico from the University of York was the last quantum theory speaker, discussing how to use spin chains to generate and store entanglement in a way that is robust against noise, showing an impressive entanglement of formation even when delays were as long as 10% of entanglement time. Lorenzo Maccone from the University of Pavia led us next into the theory of digitial quantum metrology, in a talk filled with interesting theorems, complex integrals and great pictures of whales! And last but by no means least, Miles Padgett from the University of Glasgow highlighted a misunderstanding of ghost imaging, by showing that it cannot give you a better resolution than classical imaging, but can offer other benefits.

Finally, after three days of talks, discussions, and sunshine, Ruth Oulton, QET Labs' deputy director, closed the conference - safe in the knowledge that BQIT will return on 3-5 April 2019.

This year's BQIT team

Further information on this year's workshop can be found on our website

For photos of BQIT:18 please visit our Flickr page

Videos of all of our talks from the workshop will be available on our Youtube channel

For information on upcoming events, or for more information and queries please email us at

This year's BQIT blogs were written by QET Labs and Quantum Engineering CDT students Jeremy Adcock and Alex Moylett.


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