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Dive into the research topics where Ben Cemlyn is active.

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Featured researches published by Ben Cemlyn.


Optics Express | 2009

Nonclassical 2-photon interference with separate intrinsically narrowband fibre sources

Matthaeus Halder; J Fulconis; Ben Cemlyn; Alex S. Clark; C Xiong; William J. Wadsworth; John G. Rarity

In this paper, we demonstrate a source of photon pairs based on four-wave-mixing in photonic crystal fibres. Careful engineering of the phase matching conditions in the fibres enables us to create photon pairs at 597 nm and 860 nm in an intrinsically factorable state showing no spectral correlations. This allows for heralding one photon in a pure state and hence renders narrow band filtering obsolete. The source is narrow band, bright and achieves an overall detection efficiency of up to 21% per photon. For the first time, a Hong-Ou-Mandel interference with unfiltered photons from separate fibre sources is presented.


New Journal of Physics | 2011

Intrinsically narrowband pair photon generation in microstructured fibres

Alex S. Clark; Bryn Bell; J Fulconis; Matthaeus Halder; Ben Cemlyn; Olivier Alibart; C Xiong; William J. Wadsworth; John Rarity

In this paper, we study the tailoring of photon spectral properties generated by four-wave mixing in a birefringent photonic crystal fibre (PCF). The aim is to produce intrinsically narrow-band photons and hence to achieve high non-classical interference visibility and generate high-fidelity entanglement without any requirement for spectral filtering, leading to high effective detection efficiencies. We show unfiltered Hong-Ou-Mandel interference visibilities of 77% between photons from the same PCF and 80% between separate sources. We compare results from modelling the PCF to these experiments and analyse photon purities.


Optics Letters | 2017

Secure communication systems based on chaos in optically pumped spin-VCSELs

Nianqiang Li; H. Susanto; Ben Cemlyn; Ian D. Henning; M.J. Adams

We report on a master and slave configuration consisting of two optically pumped spin-vertical-cavity surface-emitting lasers for chaos synchronization and secure communication. Under appropriate conditions, high-quality chaos synchronization is achieved. We propose two encryption schemes, where either the pump magnitude or polarization is modulated. The results show that these allow for Gb/s transmission of secure data, but exhibit different features: one indicates that the message can be recovered by the total intensity, but not the polarization components, whereas the other shows that the message can be better or exclusively retrieved from the polarization components at high bit rates.


Scientific Reports | 2018

Locking bandwidth of two laterally coupled semiconductor lasers subject to optical injection

Nianqiang Li; H. Susanto; Ben Cemlyn; Ian D. Henning; M.J. Adams

We report here for the first time (to our knowledge), a new and universal mechanism by which a two-element laser array is locked to external optical injection and admits stably injection-locked states within a nontrivial trapezoidal region. The rate equations for the system are studied both analytically and numerically. We derive a simple mathematical expression for the locking conditions, which reveals that two parallel saddle-node bifurcation branches, not reported for conventional single lasers subject to optical injection, delimit the injection locking range and its width. Important parameters are the linewidth enhancement factor, the laser separation, and the frequency offset between the two laterally-coupled lasers; the influence of these parameters on locking conditions is explored comprehensively. Our analytic approximations are validated numerically by using a path continuation technique as well as direct numerical integration of the rate equations. More importantly, our results are not restricted by waveguiding structures and uncover a generic locking behavior in the lateral arrays in the presence of injection.


european quantum electronics conference | 2009

Nonclassical interferences with separate fibre sources of intrinsically time bandwidth limited photon pairs

Mm Halder; J Fulconis; Ben Cemlyn; Alex S. Clark; C Xiong; W.J. Wadsworth; John G. Rarity

Single photons are at the heart of optical quantum technologies such as quantum cryptography, quantum computing and quantum metrology. To achieve high visibility two-photon interferences, the photons need to be in a pure state which usually is achieved by narrow band filtering. This reduces the overall efficiency of detection (µ) and hence limits current experiments to a photon number of 4–6. To achieve significant count rates for higher order multiphoton experiments (such as a cascaded CNOT or Cluster states) an improvement in µ to over 20% is essential.


Physical Review A | 2017

Effects of detuning, gain-guiding, and index antiguiding on the dynamics of two laterally coupled semiconductor lasers

M.J. Adams; Nianqiang Li; Ben Cemlyn; H. Susanto; Ian D. Henning


Physical Review A | 2017

Stability and bifurcation analysis of spin-polarized vertical-cavity surface-emitting lasers

Nianqiang Li; H. Susanto; Ben Cemlyn; Ian D. Henning; M.J. Adams


arXiv: Optics | 2018

A model for confined Tamm plasmon devices.

M.J. Adams; Ben Cemlyn; Ian D. Henning; Matthew Parker; Edmund Harbord; Ruth Oulton


Semiconductor Science and Technology | 2018

Near-threshold high spin amplification in a 1300 nm GaInNAs spin laser

Ben Cemlyn; M.J. Adams; Edmund Harbord; Nianqiang Li; Ian D. Henning; Ruth Oulton; Ville-Markus Korpijärvi; Mircea Guina


Semiconductor Science and Technology | 2018

Algebraic expressions for the polarisation response of spin-VCSELs

M.J. Adams; Nianqiang Li; Ben Cemlyn; H. Susanto; Ian D. Henning

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Alex S. Clark

Centre for Ultrahigh Bandwidth Devices for Optical Systems

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