Someone said Majorana fermions so I listened:
Physicists move one step closer to topological quantum computing
Jul 2024, phys.org
Theory predicts that a combination of superconductivity and the quantum anomalous Hall effect will give rise to topologically protected particles called Majorana fermions that will potentially revolutionize future technologies such as quantum computers.Such a combination can be achieved by inducing superconductivity in the edge of a quantum anomalous Hall insulator that is already resistance-free. The resultant chiral Majorana edge state, which is a special type of Majorana fermions, is a key to realizing "flying qubits" (or quantum bits) that are topologically protected.
via University of Cologne, KU Leuven, the University of Basel, and Forschungszentrum Jülich joint Cluster of Excellence Matter and Light for Quantum Computing ML4Q: Anjana Uday et al, Induced superconducting correlations in a quantum anomalous Hall insulator, Nature Physics (2024). DOI: 10.1038/s41567-024-02574-1
Image credit: Quantum computer with outer shielding of dilution refrigerator removed - Anna-Lena Lundqvist at Chalmers University of Technology - 2023
'Kink state' control may provide pathway to quantum electronics
Jul 2024, phys.org
Careful now
Kink states are electrical conduction pathways at the edge of the semiconducting material Bernal bilayer graphene that can regulate the flow of electrons in a quantum system via the quantum valley Hall effect.
via Pennsylvania State University: Ke Huang et al, High-temperature quantum valley Hall effect with quantized resistance and a topological switch, Science (2024). DOI: 10.1126/science.adj3742
New method could yield fast, cross-country quantum network
Jul 2024, phys.org
They're building long quantum channels using vacuum sealed tubes with an array of spaced-out lenses. These vacuum beam guides, about 20 centimeters in diameter, would have ranges of thousands of kilometers and capacities of more than 1,013 qubits per second, better than any existing quantum communication approach. Photons of light encoding quantum data would move through the vacuum tubes and remain focused thanks to the lenses.
via University of Chicago Pritzker School of Molecular Engineering, Stanford University and the California Institute of Technology Laser Interferometer Gravitational-Wave Observatory LIGO: Yuexun Huang et al, Vacuum Beam Guide for Large Scale Quantum Networks, Physical Review Letters (2024). DOI: 10.1103/PhysRevLett.133.020801.
Test of a prototype quantum internet runs under New York City for half a month
Aug 2024, phys.org
"Progress toward a fully automated practical entanglement network"Qunnect researchers used a leased 34-kilometer-long fiber circuit they called the GothamQ loop. Using polarization-entangled photons, they operated the loop for 15 continuous days, with fidelity nearly 90%.
via Qunnect Inc. in Brooklyn, New York: Alexander N. Craddock et al, Automated Distribution of Polarization-Entangled Photons Using Deployed New York City Fibers, PRX Quantum (2024). DOI: 10.1103/PRXQuantum.5.030330
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