1/11/2024 0 Comments Handmade ozone entangler![]() Local and non-local two-electron tunneling processes in a cooper pair splitter. Noncollinear spin-orbit magnetic fields in a carbon nanotube double quantum dot. Hels, M., Braunecker, B., Grove-Rasmussen, K. Probing individual split cooper pairs using the spin qubit toolkit. Evidence for crossed andreev reflection in superconductor-ferromagnet hybrid structures. Spin correlation and entanglement detection in cooper pair splitters by current measurements using magnetic detectors. Optimal entanglement witness for cooper pair splitters. Cross-correlations in a quantum dot cooper pair splitter with ferromagnetic leads. ![]() Spin-resolved andreev transport through double-quantum-dot cooper pair splitters. Nonlocal andreev transport through an interacting quantum dot. Test of bell’s inequality using the spin filter effect in ferromagnetic semiconductor microstructures. Contact resistance dependence of crossed andreev reflection. Cooper-pair-mediated coherence between two normal metals. Experimental observation of bias-dependent nonlocal andreev reflection. Random-matrix theory of quantum transport. Entanglement witnessing and quantum cryptography with nonideal ferromagnetic detectors. Entanglement detection from conductance measurements in carbon nanotube cooper pair splitters. Long-range supercurrents through a chiral non-collinear antiferromagnet in lateral josephson junctions. Crossed andreev reflection as a probe for the pairing symmetry of ferromagnetic superconductors. Odd triplet superconductivity and related phenomena in superconductor-ferromagnet structures. Magnetoresistance engineering and singlet/triplet switching in InAs nanowire quantum dots with ferromagnetic sidegates. Singlet and triplet cooper pair splitting in superconducting-semiconducting hybrid nanowires. Real-time observation of cooper pair splitting showing strong non-local correlations. Cooper pair splitting by means of graphene quantum dots. Local electrical tuning of the nonlocal signals in a cooper pair splitter. Near-unity cooper pair splitting efficiency. High-efficiency cooper pair splitting demonstrated by two-particle conductance resonance and positive noise cross-correlation. Carbon nanotubes as cooper-pair beam splitters. Cooper pair splitter realized in a two-quantum-dot y-junction. Orbital entanglement and violation of bell inequalities in mesoscopic conductors. Electronic entanglement in the vicinity of a superconductor. Andreev tunneling, coulomb blockade, and resonant transport of nonlocal spin-entangled electrons. Our results demonstrate a new route to perform spin correlation experiments in nano-electronic devices, especially suitable for those relying on magnetic field sensitive superconducting elements, like triplet or topologically non-trivial superconductors 16, 17, 18, or to perform Bell tests with massive particles 19, 20.īardeen, J., Cooper, L. We find that the spin cross-correlation is negative, consistent with spin singlet emission, and deviates from the ideal value mostly due to the overlap of the Zeeman split quantum dot states. The signals are detected in standard transport and in highly sensitive transconductance experiments. We use ferromagnetic split-gates 14, 15, compatible with nearby superconducting structures, to individually spin polarize the transmissions of the quantum dots in the two electronic paths, which act as tunable spin filters. ![]() ![]() Here we report the direct measurement of the spin cross-correlations between the currents of a Cooper pair splitter 5, 6, 7, 8, 9, 10, 11, 12, 13, an electronic device that emits electrons originating from Cooper pairs. Even though it is firmly established theoretically that the electrons in a Cooper pair 1 of a superconductor form maximally spin-entangled singlet states with opposite spin projections 2, 3, 4, no spin correlation experiments have been demonstrated so far. However, in experiments, correlations are notoriously difficult to assess on a microscopic scale, especially for electron spins. Correlations are fundamental in describing many-body systems.
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