Teleportation and a bag of chips

An optical microscope image of the Silicon chip used in the experiment.
Image credit: Llewellyn et al, doi: 10.1038/s41567-019-0727-x

In a recent collaboration spanning Bristol, Denmark, Austria, and China, we demonstrated the teleportation of quantum states of light across two millimetre-scale Silicon chips and the on-chip entanglement of four photons in a GHZ-entangled state. Together with the Huber group at IQOQI Vienna, our team developed efficient theoretical techniques for measuring the generated multi-photon entangled states. These results open the door towards CMOS-compatible quantum technology applications in networking and computation.

Publication: D. Llewellyn et al, “Chip-to-chip quantum teleportation and multi-photon entanglement in silicon,” Nature Physics 16, 148–153 (2020).

PRX: Entanglement beats the Noise

Artist’s depiction of entanglement surviving the onslaught of noise!
(Image credit: Harald Ritsch for IQOQI Vienna)

In our new paper on “Overcoming Noise in Entanglement Distribution” co-authored with colleagues in Austria, Finland, Germany, and Canada, we demonstrate how high-dimensional entanglement in the spatio-temporal degrees of freedom allows one to tolerate large amounts of noise that would generally lead to a loss of qubit, or two-dimensional entanglement. In other words, we certified entanglement with the laboratory lights on! This works demonstrates the potential for high-dimensional quantum states to not only enable high-capacity quantum networks, but also operate in realistic environmental conditions, such as in broad daylight or alongside classical data traffic. For more information, please read this APS synopsis.

Popular media coverage: Heriot-Watt press release, Wiener Zeitung,
Journal reference: Ecker et al, Phys. Rev. X 9, 041042 (2019), doi: 10.1103/PhysRevX.9.041042.

Welcome Clara and Suraj!

We’d like to welcome two new students in our group who join us for an exciting summer of quantum photonics research!

Clara Flegel is a third-year undergraduate student at Heriot-Watt and is a recipient of the IPAQS undergraduate vacation scholarship.

Suraj Goel is visiting us from the Indian Institute of Technology, Delhi, where he is a fourth-year undergraduate student.

Mehul @ QuICC 2019

Leeds University Great Hall
Photo: Paul Harrop (cc-by-sa/2.0)

Mehul will be giving a series of lectures on entanglement certification in the lab at the annual Quantum Information, Computing, and Control (QuICC) summer school, organised by the Controlled Quantum Dynamics CDT at Imperial College, London.

The QuICC summer school will go from August 19th to 23rd at the University of Leeds, and will feature lectures by Sir Peter Knight and Dr Almut Beige, among others. The school is aimed at final year undergraduates and first-year PhD students, and has an application deadline of June 8th.

Congratulations Sean!

Congratulations to Sean Condy, who successfully completed his 4th year BSc project with us on pixel entanglement. Sean will go on to start an exciting new job this summer carrying out research as part of the UK government, and we wish him all the best!

Sean giving his final year BSc presentation to the Physics department