Time-Reversal-Symmetry-Breaking Superconductivity in Epitaxial Bismuth/Nickel Bilayers
Superconductivity that spontaneously breaks time-reversal symmetry (TRS) has been found, so far, only in a handful of 3D crystals with bulk inversion symmetry. Here we report an observation of spontaneous TRS breaking in a 2D superconducting system without inversion symmetry: the epitaxial bilayer films of bismuth and nickel. The evidence comes from the onset of the polar Kerr effect at the superconducting transition in the absence of an external magnetic field, detected by the ultrasensitive loop-less fiber-optic Sagnac interferometer.
Optomechanically-induced chiral transport of phonons in one dimension
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Cavity Cooling of Many Atoms
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Multipartite entanglement detection with one random observable
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Exact Machine Learning Topological States
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Disorder-induced quantized pumping in a Floquet topological phase
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Realizing quantum advantage without entanglement in single-photon states
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Quantum Discord expresses quantum correlations beyond those associated with entanglement. Although its theory has been extensively studied, quantum discord has yet to become a standard tool in experimental studies of correlations. We propose an optical circuit for attaining quantum measurement advantage in a system that has no quantum entanglement. Our device
Shortcuts to quantum network routing
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Trapped ions as a quantum spin glass annealer
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Solving spin glass models is a complex, often NP-hard, task. In this talk, I will discuss a strategy to attack this problem using trapped ions as a flexible emulator of spin Hamiltonians. Studying its dynamics in a slowly decaying magnetic field, such system can be used as a quantum annealer which might be capable of solving hard optimization problems in polynomial time.