<\/p>\n
“On-chip nanophotonics: controlling light at the single photon level”<\/p>\n
Date: 17 March 2017, 3pm-4pm<\/p>\n
Venue: C36 Physics<\/p>\n
Speaker: Dr Luca Sapienza, University of Southampton<\/p>\n
Solid-state quantum emitters are required for quantum information protocols relying on the storage, manipulation, and transmission of the information encoded in single photons through optical cavities and waveguides. Semiconductor quantum dots are particularly promising quantum light sources that can allow both the investigation of fundamental physics phenomena on a chip and quantum technology applications [1].<\/p>\n
I will discuss the implementation of quantum dot nanostructures to create simultaneously bright and pure, on-demand, single-photon sources in engineered nanophotonic devices in gallium arsenide [2] and hybrid silicon\/III-V materials [3]. I will present different photonic geometries for controlling light propagation, brightness and spontaneous emission rate, based on circular grating and ring cavities. Finally, I will focus on the comparison between highly engineered structures and disordered photonic crystal waveguides, showing efficient light confinement and optical sensing on a silicon nitride platform in the visible range of wavelengths [4].<\/p>\n
References:
\n[1] O. Gozzano, G.S. Solomon, Toward optical quantum information processing with quantum dots coupled to microstructures, Journal of the Optical Society of America B 33, C160 (2016)
\n[2] L. Sapienza, M. Davanco, A. Badolato, K. Srinivasan, Nanoscale optical positioning of single quantum dots for bright and pure single-photon emission,<\/p>\n
Nature Communications 6, 7833 (2015).
\n[3] M. Davanco, J. Liu, L. Sapienza, C.-Z. Zhang, J.V. De Miranda Cardoso, V. Verma, R. Mirin, S. W. Nam, L. Liu, K. Srinivasan, A heterogeneous III-V\/silicon integration platform for on-chip quantum photonic circuits with single quantum dot devices, arxiv.org\/abs\/1611.07654 (2016).
\n[4] T. Crane, O.J. Trojak, L. Sapienza, Anderson localisation of visible light on a nanophotonic chip, arxiv.org\/abs\/1605.08614 (2016).<\/p>\n
Grainne Wilkinson<\/strong><\/p>\n <\/p>\n Electroweak production measurements at the LHCb experiment<\/p>\n Date: 17 March 2017, 13:45 – 14:45<\/p>\n Venue: Physics C36<\/p>\n Speaker: Dr Will Barter, Manchester<\/p>\n Electroweak production measurements at the LHCb experiment<\/p>\n LHCb is able to make important contributions in areas of research beyond\u00a0LHCb\u2019s original remit in beauty and charm physics. I will present the\u00a0latest LHCb measurements of forward Electroweak Boson Production in\u00a0proton-proton collisions. These results provide unique constraints on\u00a0the parton distribution functions which describe the inner structure of\u00a0the proton, probing a region of phase space at low Bjorken-x where the\u00a0other LHC experiments have limited sensitivity. I will also present\u00a0measurements of cross-section ratios, which can provide precision tests\u00a0of the Standard Model. I shall also present a measurement of the forward-backward asymmetry\u00a0(AFB) in Z boson decays to two muons.<\/p>\n This result allows for precision\u00a0tests of the vector and axial-vector couplings of the Z boson, providing\u00a0sensitivity to the effective weak mixing angle (sin2(\u03b8Weff)). The\u00a0AFB distribution visible in the LHCb acceptance is particularly\u00a0sensitive to this angle, as the forward phase-space probed at LHCb means\u00a0that the initial state quark direction is better known than in the\u00a0central region probed by the other LHC detectors. This reduces\u00a0uncertainties in extracting sin^2(\u03b8Weff) from A_FB, and allows\u00a0LHCb to make the most precise determination of sin2(\u03b8Weff) at the\u00a0LHC. I shall also discuss (some of) the future potential of these and related\u00a0measurements at LHCb.<\/p>\n Grainne wilkinson<\/strong><\/p>\n <\/p>\n The mains water supply (hot water and cold) \u00a0will need to be turned off for a couple of days over the Easter vacation. Please let me know as soon as possible if this will cause you problems.<\/p>\n Shonah Ion<\/strong><\/p>\n <\/p>\n As you may know Ian Bradley is retiring at the end of March. To wish Ian well for the future we\u2019ll be having drinks and nibbles in the Physics Atrium on Friday 24th March at 4 pm.<\/p>\n If you\u2019re intending to come along it would be very helpful indeed if you could let me know by email by Monday 20th.<\/p>\n Grainne Wilkinson<\/strong><\/p>\n <\/p>\n Please see below details of scheduled works on the Physics refurbishment project for week commencing Monday 20th February.<\/p>\n Should you have any queries regarding the project please contact the Senior Project Manager, Helen Wood, via the Facilities Helpdesk on facilities.helpdesk@lancaster.ac.uk<\/a> or 01524 593333.<\/p>\n \u00a0<\/strong>Charlotte Lapping<\/strong><\/p>\n <\/p>\n April\u2019s safety induction will take place on Thursday 6th April at 2:30pm in A27. Any new members of staff or those wanting a refresher please come along.<\/p>\n Shonah Ion<\/strong><\/p>\n <\/p>\n Derek Ward-Thompson at UCLan has asked me to circulate the invitation to staff here at Lancaster. It’s at Salford University on Wednesday 29th March from 10.30am till 3pm.<\/p>\nParticle Physics Seminar<\/strong><\/h2>\n
Mains water shut down over Easter Vacation<\/strong><\/h2>\n
Ian Bradley – retirement do<\/strong><\/h2>\n
Physics Refurbishment – Weekly Update<\/strong><\/h2>\n
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April Safety Induction<\/strong><\/h2>\n
Do you fancy acting as a judge at the IOP\u2019s North West\u00a0undergraduate Physics Challenge this year?<\/strong><\/h2>\n