News

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, Orf.at.
Journal reference: Ecker et al, Phys. Rev. X 9, 041042 (2019), doi: 10.1103/PhysRevX.9.041042.

arXiv: Unscrambling Entanglement through a Complex Medium

Our first major result is now on the arXiv!

Photonic high-dimensional entanglement in the spatial degree of freedom has recently emerged as a practical way to enhance the capacity of quantum information systems, as well as increase their robustness to noise. However, while qubit-entanglement has been distributed over large distances through free-space and fibre, the transport of high-dimensional entangled states of light through highly complex media has never been demonstrated.

After many months of hard work, we achieved the transport of high-dimensional spatial-mode entanglement through a commercial multi-mode fibre for the first time. In our experiment, one photon from a bipartite spatially entangled state was sent through a two-metre piece of multi-mode fibre from Thorlabs. Interestingly, while entanglement was completely lost, the resulting “scrambled” correlations captured the behaviour of the multi-mode fibre in the form of its transmission matrix. This information allowed us to recover the entanglement by only manipulating the entangled partner photon that did not enter the fibre!

For more details, please read our preprint: N. H. Valencia, S. Goel, W. McCutcheon, H. Defienne, and M. Malik, “Unscrambling Entanglement through a Complex Medium”, arXiv:1910.04490 (2019), Link: https://arxiv.org/abs/1910.04490

Congratulations Natalia! – 1st Prize!

” 1st prize for best poster goes to our wonderful Natalia Herrera Valencia! “

Nice one Natalia!!! Amazing work!!!

Natalia’s poster on “Unscrambling Entanglement Through A Complex Medium” won 1st Year Postgraduate Reseach Prize in IPaQS on Sept 11th.

The poster presented exciting new results she has obtained, demonstrating a remarkable feature of entanglement: even after one particle gets scrambled through a complex medium, we can observe the entanglement by carefully scrambling its partner!

For more details, please read our recent arXiv paper: N. H. Valencia, S. Goel, W. McCutcheon, H. Defienne, and M. Malik, “Unscrambling Entanglement through a Complex Medium”, arXiv:1910.04490 (2019), Link: https://arxiv.org/abs/1910.04490

Welcome Vatshal!

We are very happy to welcome our second PhD student Vatshal Srivastav, who joins us from India!

Vatshal comes to us after completing both his B.S and M.S. in Physics at the Indian Institute of Technology Kanpur (IITK), where he gained significant experience on theoretical models of qubits for quantum computing.

Welcome to the BBQ Lab, Vatshal!

Welcome Will!

Looking forward to all the new ideas from Will’s intricate mind!

We are delighted to welcome our first postdoc, Dr. Will McCutcheon, who joins us from Bristol, UK.

Will completed his PhD at the University of Bristol with Prof. John Rarity, followed by a two-year postdoc at Bristol Quantum Engineering Technology Laboratories.

We are very excited to add Will’s extensive knowledge and experience on both theoretical and experimental quantum information and photonics to the mix!

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.