Chronological feed of everything captured from Charles Marcus.
Researchers demonstrate optical-style diffraction in superconductor-semiconductor hybrids using multiple parallel Andreev scatterers, with phase differences controlled by tapping a remote superconducting meander. They observe local and nonlocal diffraction patterns in arrays of 2, 3, 4, and 10 scatterers, matching theory of multiple Andreev scattering. Current-carrying taps enable individual phase control over scatterers.
Covariance matrix adaptation evolutionary strategy optimizes a 3x3 gate array atop a quantum point contact, using a novel step-like conductance metric during constriction. Tight-binding simulations demonstrate mitigation of random disorder potentials via in situ gate voltage tuning. Experimental validation on a physical device yields marked improvements in conductance quantization.
This research directly images local susceptibility in hybrid Josephson junction arrays using scanning SQUID, providing insights into superconductivity coherence and its suppression near quantum phase transitions. The study reveals the amplitude and spatial phase structures of superconducting states on a square lattice of narrow islands, particularly highlighting the strongest long-range phase coherence at zero magnetic field and its fragmentation into stable regions at finite fields.