Erika Andersson | Heriot-Watt University (original) (raw)

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Papers by Erika Andersson

Optics Letters, Oct 19, 2016

Physical Review A, Oct 18, 2012

Journal of physics, Feb 19, 2003

Physical Review Letters, Feb 4, 2010

Physical Review Letters, Jan 31, 2014

Physical review, Aug 23, 2016

Nature Communications, Oct 23, 2017

Physical review, Mar 17, 2016

arXiv (Cornell University), Feb 9, 2022

Physical Review A, Dec 18, 2006

Physical Review A, Nov 16, 2007

Physical Review A, Jan 28, 2008

Physical Review A, Aug 3, 2006

Journal of Physics A, Mar 10, 2014

arXiv (Cornell University), May 27, 2015

Quantum Computing, Communication, and Simulation III

Physical Review A, Apr 7, 2015

International Conference on Quantum Information, 2011

Generalized quantum measurements are an important extension of projective or von Neumann measurem... more Generalized quantum measurements are an important extension of projective or von Neumann measurements, in that they can be used to describe any measurement that can be implemented on a quantum system. We describe how to realize two non-standard quantum measurements using cavity quantum electrodynamics (QED). The first measurement optimally and unabmiguously distinguishes between two non-orthogonal quantum states. The second example is a measurement that demonstrates superadditive quantum coding gain. The experimental tools used are single-atom unitary operations effected by Ramsey pulses and two-atom Tavis-Cummings interactions. We show how the superadditive quantum coding gain is affected by errors in the field-ionisation detection of atoms, and that even with rather high levels of experimental imperfections, a reasonable amount of superadditivity can still be seen. To date, these types of measurement have only been realized on photons. It would be of great interest to have realizations using other physical systems. This is for fundamental reasons, but also since quantum coding gain in general increases with code word length, and a realization using atoms could be more easily scaled than existing realizations using photons.

Physical review, Apr 25, 2017

Quantum digital signatures (QDS) provide a means for signing electronic communications with infor... more Quantum digital signatures (QDS) provide a means for signing electronic communications with informationtheoretic security. However, all previous demonstrations of quantum digital signatures assume trusted measurement devices. This renders them vulnerable against detector side-channel attacks, just like quantum key distribution. Here, we exploit a measurement-device-independent (MDI) quantum network, over a 200square-kilometer metropolitan area, to perform a field test of a three-party measurement-device-independent quantum digital signature (MDI-QDS) scheme that is secure against any detector side-channel attack. In so doing, we are able to successfully sign a binary message with a security level of about 10 −7. Remarkably, our work demonstrates the feasibility of MDI-QDS for practical applications.

New Journal of Physics, Oct 29, 2015

We observe Wannier-Stark localization in curved photonic lattices, realized using arrays of evane... more We observe Wannier-Stark localization in curved photonic lattices, realized using arrays of evanescently coupled optical waveguides. By correctly tuning the strength of inter-site coupling in the lattice, we observe that Wannier-Stark states become increasingly localized, and eventually fully localized to one site, as the curvature of the lattice is increased. We then demonstrate that tunneling can be successfully restored in the lattice by applying a sinusoidal modulation to the lattice position, an effect that is a direct analogue of photon-assisted tunneling. This precise tuning of the tunneling matrix elements, through laser-fabricated on-site modulations, opens a novel route for the creation of gauge fields in photonic lattices.