Quantum metasurface for multiphoton interference and state reconstruction.

Metasurfaces based on resonant nanophotonic structures have enabled innovative types of flat-optics devices that often outperform the capabilities of bulk components, yet these advances remain largely unexplored for quantum applications. We show that nonclassical multiphoton interferences can be achieved at the subwavelength scale in all-dielectric metasurfaces. We simultaneously image multiple projections of quantum states with a single metasurface, enabling a robust reconstruction of amplitude, phase, coherence, and entanglement of multiphoton polarization-encoded states.

Direct characterization of a nonlinear photonic circuit's wave function with laser light.

Integrated photonics is a leading platform for quantum technologies including nonclassical state generation, demonstration of quantum computational complexity and secure quantum communications. As photonic circuits grow in complexity, full quantum tomography becomes impractical, and therefore an efficient method for their characterization is essential. Here we propose and demonstrate a fast, reliable method for reconstructing the two-photon state produced by an arbitrary quadratically nonlinear optical circuit.

Two-photon tomography using on-chip quantum walks.

We present an approach to quantum tomography based on first expanding a quantum state across extra degrees of freedom and then exploiting the introduced sparsity to perform reconstruction. We formulate its application to photonic circuits and show that measured spatial photon correlations at the output of a specially tailored discrete-continuous quantum walk can enable full reconstruction of any two-photon spatially entangled and mixed state at the input. This approach does not require any tunable elements, so it is well suited for integration with on-chip superconducting photon detectors.

Using the patient-centred medicine clinical framework to better appreciate and explore the many barriers to care in type 2 diabetes.

There are many barriers to diabetes care. This paper explores whether organising these barriers to Type 2 diabetes care within the clinical framework of patient-centred medicine (PCM) enables a better appreciation and conceptualisation of these barriers. The terms 'diabetes', 'barriers to care', 'self-management', 'patient-centred care' and 'outcome assessment' were used to identify 28 articles describing multiple barriers (minimum of three) to care in Type 2 diabetes.

A patient-centred clinical approach to diabetes care assists long-term reduction in HbA1c.

Introduction: Patient-centred care has proven to be cost-effective, with a positive impact on health outcomes. A patient-centred approach is recognised as a desirable component of diabetes care.

Aim: The aim of this audit was to determine if the specific patient-centred intervention offered by a clinical service (GPSI Diabetes service) improves diabetes care, as measured by changes in glycosylated haemoglobin (HbA1c).