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Quantum Information Science news

Covert quantum sensing work presented at ISIT

Recent work on covert quantum sensing by Christos and Animesh is today being presented at the IEEE International Symposium on Information Theory in Aachen (ISIT 2017) by collaborator Boulat Bash. Typically parameter estimation benefits from the use of high energy probe states which use many photons to obtain a high-precision estimate of an unknown parameter. However such probes can easily be detected by an adversary who can recognise an attempt to probe this system by detecting these probe photons. In order to prevent the target itself or any third-parties from observing an attempt at sensing it is necessary to devise covert methods, hiding the probe state photons among thermal photons from the environment, which restrict the attainable precision. To quantify this restriction, a covertness constraint is derived which imposes a limitation on the probe state energy. While the mean square error scales, in general, with the number of repeated channel uses; these new results show that the improvement cannot exceed the square root of n without compromising the covertness of the measurement when using an n-mode state or making n uses of the channel.

Fri 30 Jun 2017, 10:58 | Tags: Publications

Quantum biology paper published in J. Phys. Chem. Lett.

George, Luke, and Animesh have recently had a paper published in The Journal of Physical Chemistry Letters (DOI: 10.1021/acs.jpclett.7b00829) in collaboration with Patrick Rowe and Alessandro Troisi (both formerly Warwick Chemistry, now UCL and Liverpool respectively). In this latest work they explore the relationship between structure and energy transport on the nanoscale. In particular, they look at 50,000 different ways of arranging 6 bacteriochlorophyll molecules between a fixed input and output molecule. One such arrangement is the naturally occurring one found in the famous Fenna-Matthews-Olsen (FMO) light-harvesting complex — a prototypical component of photosynthesis. Whether the FMO has been adapted to support very efficient transport of a quantum of energy from where it is absorbed (elsewhere in the organism, eventually arriving at the 'input') to the reaction centre (the ‘output’, where it is stored as chemical energy) is a long-standing question. By looking at many alternative structures, one can gain some insight into this puzzle, and also try to identify which structural features of a general structure are important for optimising energy transport. Such insight would likely be very useful in designing artificial energy transport structures such as those found in solar cells.

Mon 08 May 2017, 12:29 | Tags: Publications

George published in NJP

With his latest publication in the New Journal of Physics (DOI: 10.1088/1367-2630/aa54ab), George has proposed experimental tests which can further constrain the extent to which the wavefunction can be epistemic (and thus representing only a lack of knowledge as to the true physical state of reality).

Fri 24 Feb 2017, 17:23 | Tags: Publications

Shibdas Roy joins as a postdoc

Shibdas joins us from NUS where he was a postdoc in Mankei Tsang's group, having previously completed his PhD at the University of New South Wales, Australia. His primary research interest is in quantum measurement and control theory.

Thu 26 Jan 2017, 14:41 | Tags: People

Quantum metrology paper in PRA

Christos, Dominic and Animesh's paper on quantum-enhanced estimation of multiple phase parameters has been published in Physical Review A. It looks at fundamental bounds on the performance of Gaussian states for estimation of multiple phase parameters and the advantage gained over multiple individual estimation strategies. The results also suggest that the optimal states for single phase estimation do not necessarily have the same performance when generalised to the estimation of multiple similar parameters.

Sat 29 Oct 2016, 18:34 | Tags: Publications

Samuele, Jamie and Luke join us

Samuele and Jamie start their PhDs with us this week. Samuele joins us from the University of Turin. He will be working on quantum verification and is supported by the UK Quantum Technology hub NQIT. Jamie joins us from Aberystwyth University. He will be working on quantum-enhanced sensing, and is supported by the CDT on Diamond Technologies. Luke will continue his BSc project work in quantum biology on to an MSc with us.

Sat 01 Oct 2016, 10:40 | Tags: People

`Quantum measurement' Physics Day on Sept. 28

George, along with Rudo Roemer and Gavin Morley is organising a 1-day workshop on Quantum measurement: a dialog of big and small on September 28, 2016. The set of speakers is distinguished and the day should be interesting ! To find out how to attend, please visit the website

Thu 08 Sep 2016, 10:27 | Tags: Events

Quantum optics paper in PRL

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Paper on inferring quantum correlations from limited data outputs of quantum optics experiments is published in Physical Review Letters.

Sat 27 Aug 2016, 16:05 | Tags: Publications

Theodoros Kapourniotis joins as a postdoc

Theodoros worked on his PhD with Elham Kashefi at the University of Edinburgh's School of Informatics. He completed his PhD is early 2016, and his specialisation lies in the area of verification methods for quantum computation.

Thu 10 Mar 2016, 20:42 | Tags: People

Quantum metrology paper in PRL

Tillmann's paper on the quantum enhanced estiamtion of non-commuting phases is published in Physical Review Letters. It shows that the simultaneous estimation of all three components of a magnetic field can be better than estimating them indivdually. It presents the measurements that come close to attaining the quantum limit. Our study also reveals that too much quantum entanglement may be detrimental to attaining the Heisenberg scaling in the estimation of unitarily generated parameters.

Here is the link to a highlight on the Physics website.

Sun 14 Feb 2016, 12:18 | Tags: Publications

George Knee joins on an 1851 Fellowship

George completed his PhD from Oxford with Simon Benjamin and Andrew Briggs in 2014. He then spent a year at NTT in Japan. He was awarded the very presitgious 1851 Research Fellowship in 2015.

Fri 04 Dec 2015, 14:01 | Tags: People

Paper on tomography of superconducting detectors published in New Journal of Physics

Latest paper with Ian Walmsley's group at Oxford, studying how photon numbers can be inferred from the continuous trace outputs of superconducting transition edge sensors.

Wed 28 Oct 2015, 11:26 | Tags: Publications

Dominic Branford joins as PhD student

Dominic finished his undergraduate degree in Oxford, where he did a Master's project in quantum optics and quantum information.

Thu 08 Oct 2015, 15:18 | Tags: People

Recognising outstanding refereeing

New Journal of Physics and the Institute of Physics are delighted to recognise the outstanding contribution of Animesh Datta towards New Journal of Physics’ peer review process during 2014.

The Editorial Board acknowledges Animesh Datta among the top 5% of referees and award this certificate of recognition to mark his dedication and professional excellence within the journal.

j_njp_ce_0515_recognition_67.png

Tue 23 Jun 2015, 19:29 | Tags: People

Christos Gagatsos joins us as a postdoc.

Christos completed his PhD in Brussels last year, working with Nicolas Cerf on quantum optics and quantum information theory.

Fri 05 Jun 2015, 12:22 | Tags: People

Weak measurement metrology paper published in Physical Review Letters

after an 18-month long refereeing progress. See here for the published version, and here for the ancient arXiv version.

Joint work with Lijian Zhang (Nanjing) and Ian Walmsley (Oxford).

Thu 28 May 2015, 22:31 | Tags: Publications

£15 million to train Quantum Engineers

The government announced £15 million towards training the next generation of quantum engineers with the creation of 'skills hubs' across the UK, working in partnership with industry to deliver career training for PhD students

Fri 27 Mar 2015, 12:01 | Tags: Government strategy

National strategy for quantum technologies launched

The UK Government has invested £270 million in the UK National Quantum Technology Programme demonstrating its committment to create a valuable and sustainable quantum industry in the UK over the next two decades.

David Delpy, Chair of the UK National Quantum Technologies Programme Strategic Advisory Board, said: "This investment into Quantum Technologies represents the biggest single investment in a disruptive technology of the modern era. The UK has long been recognised as a world leader in quantum research, and we now have a real chance to build a solid and successful industrial base around that excellence in fundamental science and engineering. A concerted effort will allow for the creation of an industry that will deliver clear benefits back to the UK.

Read the full National Strategy for Quantum Technologies report

Fri 27 Mar 2015, 11:30 | Tags: Government strategy

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