Quantum coherence is the central element of particle states, and it characterizes the overall performance of various quantum materials. Bloch oscillation is a fundamental coherent behavior of particles under a static potential, which can be easily destroyed by Zener tunneling in multiband 2D lattice materials. The control of Zener tunneling therefore plays the key role in quantum engineering for complicated physical systems. Here, the inhibition and reconstruction of Zener tunneling in photonic honeycomb lattices are experimentally demonstrated. Deformed honeycomb lattices are integrated and an effective static potential is realized on the 2D lattice materials. Zener tunneling disappears in stretch‐type lattices and wave packets stay in the dispersionless upper energy band. On the contrary, Zener tunneling is greatly enhanced in compression‐type lattices and wave packets exhibit directional oscillations without branches, which manifest the preserved coherence of the wave packets. The results demonstrate the protection of photonic coherence by structurally controlling the Zener tunneling, representing a step toward flexible quantum engineering for large‐scale artificial quantum materials.
Topology have prevailed in a variety of branches of physics. And topological defects in cosmology are speculated akin to dislocation or disclination in solids or liquid crystals. With the development of classical and quantum simulation, such speculative topological defects are well-emulated in a variety of condensed matter systems. Especially, the underlying theoretical foundations can be extensively applied to realize novel optical applications. Here, with the aid of transformation optics, we experimentally demonstrated bound vortex light on optical chips by simulating gauge fields of topological linear defects in cosmology through position-dependent coupling coefficients in a deformed photonic graphene. Furthermore, these types of photonic lattices inspired by topological linear defects can simultaneously generate and transport optical vortices, and even can control the orbital angular momentum of photons on integrated optical chips.
In article number 2110044, Xian-Min Jin and co-workers report the realization of highly controllable Zener tunneling for protecting photonic coherence. The excited photonic states flow collectively along the energy band due to almost-total Zener tunneling, below which the excited states on the lattice materials undergo a directionally oscillating trajectory, directly associated with the above energy band. These results represent a step toward flexible quantum engineering for large-scale artificial quantum materials.
Case PresentationA 77-year-old man with a known history of long-standing hypertension experienced a left cerebellar hemorrhage 9 months ago, then a right cerebellar hemorrhage 3 months prior to his presentation. The patient had noticeable dysphagia that required placing a nasogastric tube for nasal feeding. The standardized swallowing assessment revealed that he had an impairment in lip closure, head, and trunk control, pharyngeal reflex, as well as independent coughing. To observe the pathophysiological changes of the pharynx and larynx, a fiberoptic laryngoscope was inserted prior to the video fluoroscopic swallowing study (VFSS), which showed that there was no pathophysiological change. VFSS detected the rhythmic tremor of the soft palate and epiglottis, with residues displayed in the vallecula and pyriform sinuses.Magnetic resonance imaging (MRI) depicted bilateral long T2 signal shadows in the cerebellum, enlargement of the bilateral olivary nucleus, with a longer T2-weighted signal change. The T2 FLAIR image demonstrated an increased signal change, with the right inferior olivary nucleus (ION) obviously larger than the left. (Fig. 1) (9 months after the left cerebellar hemorrhage, 3 months after the right cerebellar hemorrhage).
Quantum
transport is significant to understanding the evolution
of states of particles in nature. Quantum transport, based on the
fashion of adiabatic pumping and fully engineered graph, enables the
quantum-enhanced capabilities of energy transport and quantum information
processing. However, in large fully connected networks with multiple
registers, the reliability and scalability of transport are limited
by the unavoidable noises and crosstalk induced by the free interaction
enabled in real space. Here, we propose and experimentally demonstrate
a novel multiregister transport with a controllable interaction on
a photonic chip. The remote locking registers, located at the boundaries
sharing the common channel, can freely interact, supported by the
bilocalized states under the norm of local magnetic fields. Excited
photons are transferred effectively from one register to the locked
one, which are both in the same subspace without crosstalk of different
parties. Moreover, quantum correlation of photon states can be well
preserved in the multiregister transport network. Our results of on-demand
multiregister transport network with low-crosstalk integrated in the
photonic chip, which may shed light on the avenue for building the
quantum gate parallelism, is a promising route toward the scalable
quantum computing and deep quantum circuits.
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