Université de Sherbrooke

About: Université de Sherbrooke is a education organization based out in Sherbrooke, Quebec, Canada. It is known for research contribution in the topics: Population & Receptor. The organization has 14922 authors who have published 28783 publications receiving 792511 citations. The organization is also known as: Universite de Sherbrooke & Sherbrooke University.

Gentle algebras arising from surface triangulations

Abstract: We associate an algebra A(Γ) to a triangulation Γ of a surface S with a set of boundary marking points. This algebra A(Γ) is gentle and Gorenstein of dimension one. We also prove that A(Γ) is cluster-tilted if and only if it is cluster-tilted of type A or A , or if and only if the surface S is a disc or an annulus. Moreover all cluster-tilted algebras of type A or A are obtained in this way.

Coherent control of three-spin states in a triple quantum dot

Abstract: Manipulating the electrons trapped in quantum-dot pairs is one possible route to quantum computation. Translating this idea to three quantum dots would enable a whole host of extended functionality. Researchers now generate and manipulate coherent superpositions of quantum states using the spins across three electrical-gate-defined dots.

Effect of scattered-site housing using rent supplements and intensive case management on housing stability among homeless adults with mental illness: a randomized trial.

Abstract: Importance Scattered-site housing with Intensive Case Management (ICM) may be an appropriate and less-costly option for homeless adults with mental illness who do not require the treatment intensity of Assertive Community Treatment. Objective To examine the effect of scattered-site housing with ICM services on housing stability and generic quality of life among homeless adults with mental illness and moderate support needs for mental health services. Design, Setting, and Participants The At Home/Chez Soi project was an unblinded, randomized trial. From October 2009 to July 2011, participants (N = 1198) were recruited in 4 Canadian cities (Vancouver, Winnipeg, Toronto, and Montreal), randomized to the intervention group (n = 689) or usual care group (n = 509), and followed up for 24 months. Interventions The intervention consisted of scattered-site housing (using rent supplements) and off-site ICM services. The usual care group had access to existing housing and support services in their communities. Main Outcomes and Measures The primary outcome was the percentage of days stably housed during the 24-month period following randomization. The secondary outcome was generic quality of life, assessed by a EuroQoL 5 Dimensions (EQ-5D) health questionnaire. Results During the 24 months after randomization, the adjusted percentage of days stably housed was higher among the intervention group than the usual care group, although adjusted mean differences varied across study cities (Site A: 417.3 of 683.0 days [62.7%] for the intervention group vs 189.2 of 621.6 days [29.7%] for the usual care group, mean difference [MD], 33.0% [95% CI, 26.2% to 39.8%]; Site B: 491.5 of 653.4 days [73.2%] for the intervention group vs 157.0 of 606.8 [23.6%] for the usual care group, MD, 49.5% [95% CI, 41.1% to 58.0%]; Site C: 506.7 of 658.1 days [74.4%] for the intervention group vs 255.2 of 626.2 days (38.8%) for the usual care group, MD, 35.6% [95% CI, 29.4% to 41.8%]; Site D: 520.4 of 651.5 days [77.2%] for the intervention group vs 223.1 of 649.1 for the usual care group [31.8%], MD, 45.3% [95% CI, 38.2% to 52.2%]; P P =.95). Conclusions and Relevance Among homeless adults with mental illness in 4 Canadian cities, scattered site housing with ICM services compared with usual access to existing housing and community services resulted in increased housing stability over 24 months, but did not improve generic quality of life. Trial Registration isrctn.org Identifier:ISRCTN42520374

Coherent spin–photon coupling using a resonant exchange qubit

Abstract: Electron spins hold great promise for quantum computation because of their long coherence times. Long-distance coherent coupling of spins is a crucial step towards quantum information processing with spin qubits. One approach to realizing interactions between distant spin qubits is to use photons as carriers of quantum information. Here we demonstrate strong coupling between single microwave photons in a niobium titanium nitride high-impedance resonator and a three-electron spin qubit (also known as a resonant exchange qubit) in a gallium arsenide device consisting of three quantum dots. We observe the vacuum Rabi mode splitting of the resonance of the resonator, which is a signature of strong coupling; specifically, we observe a coherent coupling strength of about 31 megahertz and a qubit decoherence rate of about 20 megahertz. We can tune the decoherence electrostatically to obtain a minimal decoherence rate of around 10 megahertz for a coupling strength of around 23 megahertz. We directly measure the dependence of the qubit–photon coupling strength on the tunable electric dipole moment of the qubit using the ‘AC Stark’ effect. Our demonstration of strong qubit–photon coupling for a three-electron spin qubit is an important step towards coherent long-distance coupling of spin qubits. Coherent coupling between a three-electron spin qubit and single photons in a microwave resonator is demonstrated, which, unlike previous demonstrations, does not require ferromagnetic components near the qubit.