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New PhD student Matt Christensen joins

Matt Christensen has joined the Quantum Information Group within the HetSys CDT.

Thu 23 Nov 2023, 11:59

NQCC Hackathon Second Place

Ellen's team recently came 2nd in the National Quantum Computing Centre Hackathon

Tue 29 Aug 2023, 17:16 | Tags: Events

Francesco, Eva, Aiman, and Animesh's quantum spectroscopy paper is PRA Editor's Suggestion

A new paper on quantum information-theoretic formulation of electric dipole estimation in quantum spectroscopy of two-level systems is the Physical Review A Editor's suggestion.

Thu 13 Jul 2023, 16:34 | Tags: Publications

Greg Rosenthal joins the group as a new postdoc

Greg's research interests are in computational complexity theory, including quantum complexity.

Fri 07 Jul 2023, 11:34 | Tags: People

New Research Fellow Zhiwei Wang joins us

Mon 19 Dec 2022, 09:27 | Tags: People

Ellen, Sourav join as PhD students

Ellen Devereux from Fujitsu and Sourav Das from the Indian Institute of Science Education and Research, Mohali join us for their PhDs.

Wed 26 Oct 2022, 12:38 | Tags: People

Accreditation paper with Sam, IBM published

Sam's work on accreditation of quantum computations on IBM's hardware published.

Mon 11 Oct 2021, 17:08 | Tags: Publications

Aaron, Will, Gongyu join as new students.

Aaron Malcolm joins us from the University of St. Andrews his PhD. Will Hughes and Gongyu Ni join us for their Masters from Cardiff University Jilin University respectively.

Fri 08 Oct 2021, 09:42 | Tags: People

Sharmila, Francesco join us as PostDocs

Sharmila Balamurugan joins us from the Indian Institute of Technology, Madras, India, and Francesco Albarelli (re)joins us from the University of Warsaw, Poland.

Sun 12 Sep 2021, 11:15 | Tags: People

Gravity paper published

Our paper on a signature of the quantum nature of gravity in the quantum mechanical squeezing of the differential motion of two identical masses has been published.

Wed 25 Aug 2021, 15:36 | Tags: Publications

Sam wins thesis prize!

Congratulations to Sam for winning the 2020 Faculty of Science and Department of Physics Thesis Prize!

Wed 16 Jun 2021, 16:18 | Tags: People

Aiman's paper in PRL

What happens at the molecular lever when a photon hits the eye or light shines on a leaf?

Physical processes occurring on nanometre length scales and femtosecond time scales typically undergo complex dynamics involving multilevel quantum systems. Understanding such complex quantum dynamics is a major open challenge. Foremost among them is the dimension of the Hilbert space  involved, which determines the number of parameters necessary for understanding the dynamics. This is typically done by fitting models of various degrees of sophistication to experimental data.

Fri 14 May 2021, 12:42 | Tags: Publications, People

Our work on the cover of PRL

In a work appearing on the cover of Physical Review Letters, volume 125, issue 8, we with collaborators at the University of Nanjing, China and the University of Ottawa, Canada, have shown that even noisy and saturating detectors can approach shot-noise-limited detection if used judiciously. Shot-noise-limited optical detection is the first, and often the most challenging, step to quantum-enhanced optical sensing. This work uses a technique called weak-value amplification and enables, over a range of input light intensity well beyond the dynamic range of the photodetector, shot-noise-limited detection. Weak-value amplification relies on the principle that only a subset of the photons contains almost all of the information about the sensed object.

Mon 24 Aug 2020, 12:22 | Tags: Publications

Accreditation protocol published in New Journal of Physics

As the first generation of quantum computers are now reaching the point where they can answer such otherwise impossible questions, it is necessary to consider how the answers of these early devices can be confirmed correct. The full power of quantum computing includes a wide range of problems for which this is not possible, instead demanding new techniques to test quantum computers. A new test has now been proposed by Samuele, Theodoros, and Animesh which can be used to make sure the quantum computer is working correctly without using excessive additional resources while still testing the entire quantum computer. Published in the New Journal of Physics (DOI:10.1088/1367-2630/ab4fd6), this protocol uses circuits which have the same form as the desired circuit but are formulated to give known outcomes. Based on the accuracy of these circuits they are able to place a statistical bound on how close the distribution the quantum computer gives is to the correct distribution.

Tue 19 Nov 2019, 15:03 | Tags: Publications

Paper on evaluating fundamental sensitivity limits in Physical Review Letters

Francesco, Jamie, and Animesh have published new work in Physical Review Letters which demonstrates that the Holevo Cramér-Rao bound, the fundamental limit to how precise any sensor can be, can be evaluated by numerically efficient methods. Computation of the Holevo Cramér-Rao bound requires the solving of a non-linear optimisation problem. In this publication Francesco, Jamie, and Animesh demonstrate that the necessary optimisation can be expressed as a convex optimisation problem. This realisation allows efficient numerical evaluation of the Holevo Cramér-Rao bound, opening up the possibility of practically applying it in quantum sensing problems.

Fri 15 Nov 2019, 16:30 | Tags: Publications

Metrology papers published in Physical Review A

Two metrology papers from the group have recently been published in Physical Review A.

Mon 04 Nov 2019, 17:30 | Tags: Publications

Theo and Animesh publish quantum verification paper in Quantum

Theodoros and Animesh have published a work which sets out a method to verify quantum computational supremacy in near-future quantum devices. This work published in Quantum (DOI:10.22331/q-2019-07-12-164) introduces a verification scheme for an Ising sampler, which if implemented could prove quantum computational supremacy.

Mon 15 Jul 2019, 16:17 | Tags: Publications

Pan joins us

Pantita Palittapongarnpim joins us as a postdoc, having completed her PhD at the University of Calgary working with Barry Sanders.

Wed 10 Jul 2019, 17:52 | Tags: People

Dominic successfully defends

Dominic successfully defended his PhD thesis on Tuesday, passing with minor corrections. The examiners were Gavin Morley (Warwick) and Sougato Bose (UCL).

Thu 27 Jun 2019, 14:03 | Tags: People

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