Entanglement Assisted Probe of the Non-Markovian to Markovian Transition in Open Quantum System Dynamics.

We utilize a superconducting qubit processor to experimentally probe non-Markovian dynamics of an entangled qubit pair. We prepare an entangled state between two qubits and monitor the evolution of entanglement over time as one of the qubits interacts with a small quantum environment consisting of an auxiliary transmon qubit coupled to its readout cavity. We observe the collapse and revival of the entanglement as a signature of quantum memory effects in the environment. We then engineer the non-Markovianity of the environment by populating its readout cavity with thermal photons to show a transition from non-Markovian to Markovian dynamics, ultimately reaching a regime where the quantum Zeno effect creates a decoherence-free subspace that effectively stabilizes the entanglement between the qubits.

Evaluation of an Individualized Learning Plan Template for the Transition to Residency.

Background Specialty-specific individualized learning plans (ILPs) have been promoted to improve the undergraduate to graduate medical education transition, yet few pilots have been described. Objective To create and report on the feasibility and acceptability of a pilot internal medicine (IM) ILP template. Methods The ILP was created by a group of diverse IM expert stakeholders and contained questions to stimulate self-reflection and collect self-reported readiness data from incoming interns. US IM residency programs were invited to pilot the ILP with interns in spring 2022. Data was used at the programs' discretion. The pilot was evaluated by a post-pilot survey of programs to elicit perceptions of the impact and value of the ILP and analyze anonymous ILP data from 3 institutions. Results Fifty-two IM residency programs agreed to participate with a survey response rate of 87% (45 of 52). Of responding programs, 89% (40 of 45) collected ILPs, thus we report on data from these 40 programs. A total of 995 interns enrolled with 782 completing ILPs (79%). One hundred eleven ILPs were analyzed (14%). Most programs found the ILP valuable to understand incoming interns' competencies (26 of 40, 65%) and areas for improvement (24 of 40, 60%) and thought it should continue (29 of 40, 73%). Programs estimated the ILP took interns 29.2±14.9 minutes and 21.6±10.3 minutes for faculty mentors to complete. The most common barrier was faculty mentor participation. Conclusions An ILP based on interns' self-reported data was feasible and valuable to IM residency programs in understanding interns' competencies and areas for improvement.

Anomalous thermal diffusivity in underdoped YBa2Cu3O6+x.

The thermal diffusivity in the [Formula: see text] plane of underdoped YBCO crystals is measured by means of a local optical technique in the temperature range of 25-300 K. The phase delay between a point heat source and a set of detection points around it allows for high-resolution measurement of the thermal diffusivity and its in-plane anisotropy. Although the magnitude of the diffusivity may suggest that it originates from phonons, its anisotropy is comparable with reported values of the electrical resistivity anisotropy. Furthermore, the anisotropy drops sharply below the charge order transition, again similar to the electrical resistivity anisotropy. Both of these observations suggest that the thermal diffusivity has pronounced electronic as well as phononic character. At the same time, the small electrical and thermal conductivities at high temperatures imply that neither well-defined electron nor phonon quasiparticles are present in this material. We interpret our results through a strongly interacting incoherent electron-phonon "soup" picture characterized by a diffusion constant [Formula: see text], where [Formula: see text] is the soup velocity, and scattering of both electrons and phonons saturates a quantum thermal relaxation time [Formula: see text].