Education in Gateshead under the schools board 1870-1903

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A Bell-type test of energy-time entangled qutrits

We have performed a Bell-type test for energy-time entangled qutrits. A method of inferring the Bell violation in terms of an associated interference visibility is derived. Using this scheme we obtained a Bell value of $2.784 \pm 0.023$, representing a violation of $34 \sigma$ above the limit for local variables. The scheme has been developed for use at telecom wavelengths and using proven long distance quantum communication architecture to optimize the utility of this high dimensional entanglement resource.Comment: replaced lost acknowledement

Stationary state entanglement and total correlation of two qubits or qutrits

We investigate the mutual information and entanglement of stationary state of two locally driven qubits under the influence of collective dephasing. It is shown that both the mutual information and the entanglement of two qubits in the stationary state exhibit damped oscillation with the scaled action time $\gamma{T}$ of the local external driving field. It means that we can control both the entanglement and total correlation of the stationary state of two qubits by adjusting the action time of the driving field. We also consider the influence of collective dephasing on entanglement of two qutrits and obtain the sufficient condition that the stationary state is entangled.Comment: 5 pages, 2 figures, RevTex

Successful remote treatment of a client with Hikikomori using internet-delivered cognitive therapy for social anxiety disorder: a case report

Hikikomori (prolonged social withdrawal) has been discussed as a hidden worldwide epidemic and a significant social and healthcare issue. Social anxiety disorder is the most common psychiatric disorder preceding the onset of Hikikomori. Although studies exist suggesting the effectiveness of family-support interventions, little is known about psychotherapeutic approaches for Hikikomori individuals. Here, we present a case of Hikikomori wherein an internet-delivered cognitive therapy for social anxiety disorder (iCT-SAD) worked effectively in improving the client’s social anxiety symptoms and social interaction behaviors. This case study demonstrates the principle that evidence-based psychological interventions focusing on social anxiety can be effective for clients with Hikikomori. Furthermore, the online mode of treatment delivery, along with a variety of relevant modules, may facilitate clients’ engagement with treatment at home. The findings suggest that iCT-SAD might be a promising option for Hikikomori clients who have social anxiety problems, within the recommended stepped-intervention approach

Waveguide-based OPO source of entangled photon pairs

In this paper we present a compact source of narrow-band energy-time entangled photon pairs in the telecom regime based on a Ti-indiffused Periodically Poled Lithium Niobate (PPLN) waveguide resonator, i.e. a waveguide with end-face dielectric multi-layer mirrors. This is a monolithic doubly resonant Optical Parametric Oscillator (OPO) far below threshold, which generates photon pairs by Spontaneous Parametric Down Conversion (SPDC) at around 1560nm with a 117MHz (0.91 pm)- bandwidth. A coherence time of 2.7 ns is estimated by a time correlation measurement and a high quality of the entangled states is confirmed by a Bell-type experiment. Since highly coherent energy-time entangled photon pairs in the telecom regime are suitable for long distance transmission and manipulation, this source is well suited to the requirements of quantum communication.Comment: 13 page

Exploring the perspectives of ‘young adults’ (18–24) who have been in formal care and their experiences of attending a socially prescribed community allotment gardening group

Introduction: Young adults who have experienced periods of time being ‘in care’ are one of the most socially deprived populations within society, with their needs largely unmet and often not fully understood. Despite the significant attempts to invest in community-based ‘social prescribing’ interventions to address such health inequalities, there is a dearth of understanding regarding how such occupation-based community groups are experienced by this particular population. This UK based qualitative study aimed to explore the experiences of young adult ‘Care Leavers’ regarding their participation in a socially prescribed community gardening group. Method: Semi-structured online interviews were conducted with six young care leavers aged between 18 and 24 years who regularly participated in a community gardening group. Interviews were recorded transcribed verbatim and analysed Braun and Clarke’s Thematic Analysis process by two researchers to maximise validity. Findings: Four key themes emerged: ‘Social belonging and connection’, ‘A safe space’, ‘Sense of achievement from active engagement’ and ‘The facilitatory aspects of nature’. The findings suggested nature-based co-occupation within a local group, enhanced social capital, self-identity and wellbeing. Conclusion: This study supports the emerging scope of using community occupation-based interventions with young adult ‘Care Leavers’ and offers an insight into their particular needs

Acknowledging religion in cognitive behavioural therapy: the effect on alliance, treatment expectations and credibility in a video-vignette study

Objectives: Developing mental health services which are accessible and acceptable to those from minority backgrounds continues to be a priority. In the United Kingdom, individuals who identify with a religion are underrepresented in Talking Therapies services as compared to those with no religion. This necessitates an understanding of how therapy is perceived. This online study explored the impact of explicitly acknowledging religion on anticipated alliance, treatment credibility and expectations of therapy in a non-clinical sample of British Muslims. Methods: A video-vignette experimental design was used in which participants who self-reported as either high or low in religiosity were randomly allocated to receiving information about cognitive behavioural therapy either with or without an explicit mention of religion as a value in the therapeutic process. Results: One hundred twenty-nine British Muslim adults aged 18–70+ years from various ethnic backgrounds participated in the study. Between-subjects ANOVAs showed that scores on the perceived credibility of therapy and treatment expectations were significantly higher when religion was explicitly mentioned by the ‘therapist’, but that acknowledging religion did not impact upon anticipated alliance. Conclusions: These findings suggest that mentioning religion as a value to be considered in therapy has some positive impacts upon how therapy is perceived by British Muslims. Although video vignettes do not provide insight into the complexity of actual therapeutic encounters, acknowledging religion in mental health services more broadly remains an important consideration for improving equity of access and may bear relevance to other minoritized groups

Decoherence-based exploration of d-dimensional one-way quantum computation

We study the effects of amplitude and phase damping decoherence in d-dimensional one-way quantum computation (QC). Our investigation shows how information transfer and entangling gate simulations are affected for d>=2. To understand motivations for extending the one-way model to higher dimensions, we describe how d-dimensional qudit cluster states deteriorate under environmental noise. In order to protect quantum information from the environment we consider the encoding of logical qubits into physical qudits and compare entangled pairs of linear qubit-cluster states with single qudit clusters of equal length and total dimension. Our study shows a significant reduction in the performance of one-way QC for d>2 in the presence of Markovian type decoherence models.Comment: 8 pages, 11 figures, RevTeX

Nonlinear interaction between two heralded single photons

Harnessing nonlinearities strong enough to allow two single photons to interact with one another is not only a fascinating challenge but is central to numerous advanced applications in quantum information science. Currently, all known approaches are extremely challenging although a few have led to experimental realisations with attenuated classical laser light. This has included cross-phase modulation with weak classical light in atomic ensembles and optical fibres, converting incident laser light into a non-classical stream of photon or Rydberg blockades as well as all-optical switches with attenuated classical light in various atomic systems. Here we report the observation of a nonlinear parametric interaction between two true single photons. Single photons are initially generated by heralding one photon from each of two independent spontaneous parametric downconversion sources. The two heralded single photons are subsequently combined in a nonlinear waveguide where they are converted into a single photon with a higher energy. Our approach highlights the potential for quantum nonlinear optics with integrated devices, and as the photons are at telecom wavelengths, it is well adapted to applications in quantum communication.Comment: 4 pages, 4 figure

Mixed State Entanglement: Manipulating Polarisation-Entangled Photons

There has been much discussion recently regarding entanglement transformations in terms of local filtering operations and whether the optimal entanglement for an arbitrary two-qubit state could be realised. We introduce an experimentally realisable scheme for manipulating the entanglement of an arbitrary state of two polarisation entangled qubits. This scheme is then used to provide some perspective to the mathematical concepts inherent in this field with respect to a laboratory environment. Specifically, we look at how to extract enhanced entanglement from systems with a fixed rank and in the case where the rank of the density operator for the state can be reduced, show how the state can be made arbitrarily close to a maximally entangled pure state. In this context we also discuss bounds on entanglement in mixed states.Comment: 12 pages, 10 figure