Publications by authors named "Yun-Hao Shi"
Topological phases are robust against weak perturbations, but break down when disorder becomes sufficiently strong. However, moderate disorder can also induce topologically nontrivial phases. Thouless pumping, as a (1+1)D counterpart of the integer quantum Hall effect, is one of the simplest manifestations of topology.
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- The study investigates hydrodynamic transport properties in quantum dynamics to better understand exotic non-equilibrium phases of matter, focusing on simulating infinite-temperature transport in complex quantum systems.
- By using a controllable superconducting quantum simulator, the researchers successfully prepared Haar-random states and observed diffusive spin transport with ergodic dynamics during the unitary evolution of a ladder-type quantum simulator.
- They also examined the effects of strong disorder and tilted potential on transport properties, discovering signs of anomalous subdiffusion and thermalization breakdown, highlighting a scalable approach for investigating infinite-temperature spin transport.
Article Synopsis
- - The study focuses on using a 43-qubit superconducting quantum processor, called Chuang-tzu, to simulate exotic topological phases of quantum matter and explore their properties.
- - Researchers engineered diagonal Aubry-André-Harper models and successfully demonstrated the Hofstadter butterfly energy spectrum, along with experimental verification of topological zero modes, which had not been observed before.
- - The significant number of qubits enables the capture of complex topological features in quantum systems, paving the way for advanced simulations of quantum topological systems using noisy intermediate-scale quantum (NISQ) technology.
The quantum Hall effect, fundamental in modern condensed matter physics, continuously inspires new theories and predicts emergent phases of matter. Here we experimentally demonstrate three types of Chern insulators with synthetic dimensions on a programable 30-qubit-ladder superconducting processor. We directly measure the band structures of the 2D Chern insulator along synthetic dimensions with various configurations of Aubry-André-Harper chains and observe dynamical localisation of edge excitations.
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- Hawking radiation, a phenomenon associated with black holes, arises from quantum tunneling at the event horizon and is challenging to observe in astrophysical black holes.
- Researchers created an analogue black hole using 10 superconducting transmon qubits, allowing them to study the quantum behavior of particles in a curved spacetime that simulates black hole conditions.
- The experiment verified stimulated Hawking radiation through state tomography and measured dynamics of entanglement, suggesting potential for further exploration of black hole features with programmable superconducting technology.
Multipartite entangled states are significant resources for both quantum information processing and quantum metrology. In particular, non-Gaussian entangled states are predicted to achieve a higher sensitivity of precision measurements than Gaussian states. On the basis of metrological sensitivity, the conventional linear Ramsey squeezing parameter (RSP) efficiently characterizes the Gaussian entangled atomic states but fails for much wider classes of highly sensitive non-Gaussian states.
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