Detector imperfections in photon-pair source characterization

We analyze how imperfections in single-photon detectors impact the characterization of photon-pair sources. We perform exact calculations to reveal the effects of multi-pair emissions and of noisy, non-unit efficiency, non photon-number resolving detections on the Cauchy-Schwarz parameter, on the second order auto-correlation and cross-correlation functions, and on the visibilities of both Hong-Ou-Mandel and Bell-like interferences. We consider sources producing either two-mode squeezed states or states with a Poissonian photon distribution. The proposed formulas are useful in practice to determine the impacts of multi-pair emissions and dark counts in standard tests used in quantum optics.Comment: 9 pages, 11 figure

Temporal multimode storage of entangled photon pairs

Multiplexed quantum memories capable of storing and processing entangled photons are essential for the development of quantum networks. In this context, we demonstrate the simultaneous storage and retrieval of two entangled photons inside a solid-state quantum memory and measure a temporal multimode capacity of ten modes. This is achieved by producing two polarization entangled pairs from parametric down conversion and mapping one photon of each pair onto a rare-earth-ion doped (REID) crystal using the atomic frequency comb (AFC) protocol. We develop a concept of indirect entanglement witnesses, which can be used as Schmidt number witness, and we use it to experimentally certify the presence of more than one entangled pair retrieved from the quantum memory. Our work puts forward REID-AFC as a platform compatible with temporal multiplexing of several entangled photon pairs along with a new entanglement certification method useful for the characterisation of multiplexed quantum memories

Self-reported attitudes, skills and use of evidence-based practice among Swiss chiropractors: A national survey

Study Objectives The high burden of disease associated with musculoskeletal disorders severely impacts patients’ well-being. As primary care providers, Swiss chiropractors ought to contribute towards identifying and using effective treatment strategies. An established approach is the full integration of evidence-based practice (EBP). This study aimed to investigate the attitudes, skills and use of EBP among Swiss chiropractors, as well as investigating potential facilitators and barriers for its adoption. Methods and material All 329 members of the Swiss Association of Chiropractic (ChiroSuisse) were invited in March 2021 to participate in this cross-sectional survey. Data were acquired anonymously online, using the Evidence-Based practice Attitude and utilization SurvEy (EBASE). The survey encompassed 55 questions measuring attitudes (n = 8, response range 1–5; total score range of 8–40), skills (n = 13, response range 1–5; total score range of range of 13–65) and use of EBP (n = 6, response range 0–4; total score range of 0–24). Results 228 (69.3%) chiropractors returned complete EBASE questionnaires. This sample was representative of all ChiroSuisse members with respect to gender, age groups and proportion of chiropractic residents. Respondents generally held positive attitudes towards EBP, as indicated by the high mean (31.2) and median (31) attitude sub-score (range 11–40). Self-reported skills had a mean sub-score of 40.2 and median of 40 (range 13–65). Knowledge about EBP-based clinical practice had been primarily obtained in chiropractic under- or postgraduate education (33.8% and 26.3%, respectively). Use of EBP achieved a lower sub-score, with mean and median values of 7.4 and 6, respectively (range 0–24). The most commonly identified barriers preventing EBP uptake were lack of time (67.9%) and lack of clinical evidence in chiropractic/manual therapy-related health fields (45.1%). Conclusion Swiss chiropractors held favourable attitudes and reported moderate to moderate-high skill levels in EBP. Nevertheless, similar to chiropractors in other countries, the self-reported use of EBP was relatively low, with lack of time and lack of clinical evidence being the most named barriers

More published full-time researchers, early career researchers, clinician-researchers and graduate students unite to call for actions against the pseudoscientific claim that chiropractic care boosts immunity

Letter to the edito

Exploring the professionalization of respiratory therapy in Canada

Knowledge is believed to be essential in the evolution from occupation to profession and is valuable to a profession in three ways: it can influence the profession's legitimacy, it can be used for conducting research, and it promotes higher education. RTs possess jurisdictional professional autonomy within Canada. The privilege of self-regulation allows RTs to act according to their knowledge and judgement without direct oversight from other professions. CONCLUSION: Based on Abbott's theoretical position, RTs can rightly justify their position as professionals. However, RTs need to acknowledge that professionalization is a dynamic and continuous process that requires creative changes to innovate within the profession and support future efforts to reinforce their position as professionals. Throughout this paper, we offer suggestions for how RTs can contribute to the ongoing professionalization of respiratory therapy

What scholarly practice means to respiratory therapists: An interpretive description study

Abstract Rationale Engagement in scholarly practice has been associated with professional empowerment, role satisfaction and improvements in care delivery and patient outcomes across many healthcare professions. However, in evolving professions like respiratory therapy, scholarly practice is excluded from competency frameworks, resulting in a gap in education and subsequent application of this competency in practice. An exploration of scholarly practice in respiratory therapy may provide insights into evolving professions that face tensions between meeting competency requirements as outlined in frameworks and providing quality healthcare to the populations they serve. Aims and Objectives The aim of the study was to explore what scholarly practice means, and how it manifests in practice from respiratory therapists' (RTs) perspectives. Methods We used interpretive description methodology. We purposively sampled participants to obtain varied perspectives of scholarly practice in respiratory therapy. We conducted 26 semistructured interviews with RTs in different roles (clinicians, educators, researchers, leaders and managers) across Canada and analysed the data using inductive analysis. Data collection and analysis proceeded concurrently. Results We developed five main themes: (i) the identity of a scholarly practitioner in RTs; (ii) factors influencing scholarly practice; (iii) one's impression of their professional self-image; (iv) scholarly practice as a vehicle for changing practice and (v) the complex interconnections between knowledges and practices. Conclusion Scholarly practice appears to be a multifaceted phenomenon encompassing a wide range of activities and skills including conducting research, reflective practice, application of research to practice, and contributing to the advancement of the profession and healthcare. Scholarly practice is influenced by organisational context and culture, available resources, intrinsic motivation and external political context. We identified similarities between professional identity and the description of the scholarly practitioner, suggesting that these two phenomena may be interconnected. Furthermore, participants believed that scholarly practice could enhance the image, credibility, legitimacy and professionalisation of the profession

Identifying factors likely to influence compliance with diagnostic imaging guideline recommendations for spine disorders among chiropractors in North America: a focus group study using the Theoretical Domains Framework

Background: The Theoretical Domains Framework (TDF) was developed to investigate determinants of specific clinical behaviors and inform the design of interventions to change professional behavior. This framework was used to explore the beliefs of chiropractors in an American Provider Network and two Canadian provinces about their adherence to evidence-based recommendations for spine radiography for uncomplicated back pain. The primary objective of the study was to identify chiropractors’ beliefs about managing uncomplicated back pain without xrays and to explore barriers and facilitators to implementing evidence-based recommendations on lumbar spine xrays. A secondary objective was to compare chiropractors in the United States and Canada on their beliefs regarding the use of spine x-rays. Methods: Six focus groups exploring beliefs about managing back pain without x-rays were conducted with a purposive sample. The interview guide was based upon the TDF. Focus groups were digitally recorded, transcribed verbatim, and analyzed by two independent assessors using thematic content analysis based on the TDF. Results: Five domains were identified as likely relevant. Key beliefs within these domains included the following: conflicting comments about the potential consequences of not ordering x-rays (risk of missing a pathology, avoiding adverse treatment effects, risks of litigation, determining the treatment plan, and using x-ray-driven techniques contrasted with perceived benefits of minimizing patient radiation exposure and reducing costs; beliefs about consequences); beliefs regarding professional autonomy, professional credibility, lack of standardization, and agreement with guidelines widely varied (social/professional role & identity); the influence of formal training, colleagues, and patients also appeared to be important factors (social influences); conflicting comments regarding levels of confidence and comfort in managing patients without x-rays (belief about capabilities); and guideline awareness and agreements (knowledge). Conclusions: Chiropractors’ use of diagnostic imaging appears to be influenced by a number of factors. Five key domains may be important considering the presence of conflicting beliefs, evidence of strong beliefs likely to impact the behavior of interest, and high frequency of beliefs. The results will inform the development of a theorybased survey to help identify potential targets for behavioral-change strategies

High-efficiency WSi superconducting nanowire single-photon detectors operating at 2.5 K

We investigate the operation of WSi superconducting nanowire single-photon detectors (SNSPDs) at 2.5 K, a temperature which is ~ 70 % of the superconducting transition temperature (TC) of 3.4 K. We demonstrate saturation of the system detection efficiency at 78 +- 2 % with a jitter of 191 ps. We find that the jitter at 2.5 K is limited by the noise of the readout, and can be improved through the use of cryogenic amplifiers. Operation of SNSPDs with high efficiency at temperatures very close to TC appears to be a unique property of amorphous WSi

Historical influence on the practice of chiropractic radiology: Part I - a survey of Diplomates of the American Chiropractic College of Radiology

Background It is known that not all chiropractors follow mainstream guidelines on the use of diagnostic ionising radiation. Various reasons have been discussed in the literature, including using radiography to screen for congenital anomalies, to perform postural analysis, to search for contraindications to spinal manipulation, and to document chiropractic subluxations, i.e., tiny anatomical displacements of vertebrae thought to affect nerves and health. The visualisation of subluxations was the reason chiropractic first adopted the x-ray in 1910. There has never been a study of the influence of this historical paradigm of radiography on the practices of chiropractic radiologists (DACBRs or Diplomates of the American Chiropractic College of Radiology). Methods A survey was administered with a modified Dillman method using SurveyMonkey and supplemented by hard copies distributed at a professional conference. The target population was all active DACBRs. There were 34 items, which consisted of multiple choice and open-ended interrogatives on all three areas in which chiropractic radiologists work: education, clinical practice, and radiology practice. Results The response rate was 38% (73 of 190 DACBRs). Respondents reported that the historical paradigm of radiography was found in all areas of practice, but not as a major aspect. The majority of respondents did not condone that historical paradigm, but many tolerated it, particularly from referring chiropractors. Radiographic subluxation analysis was reportedly perpetuated by private clinical practitioners as well as technique instructors and supervising clinicians in the teaching institutions. Conclusions Within the chiropractic profession, there is a continuing belief in radiographically visible subluxations as a cause of suboptimal health. This situation is sustained in part due to the reticence of other chiropractors to report these practices to licensing and registration boards. Investigation into other structures supporting a vitalistic belief system over science in chiropractic is recommended. In addition, it may be useful to explore remunerative systems that move beyond the inherently conflicted fee-for-service model