Spin–orbit coupling is an essential mechanism underlying quantum phenomena such as the spin Hall effect and topological insulators1. It has been widely studied in well-isolated Hermitian systems, but much less is known about the role dissipation plays i
Quantum metrology and sensing aim to improve measurement precision over classical devices by exploiting uniquely quantum phenomena such as entanglement and squeezing1,2,3. It is interesting to ask whether distinct effects associated with non-Hermitian dynamics can also be used to improve sensors operatin...
Topology is a fascinating phenomena in condensed-matter physics typically associated with a bulk gap. However, recent research shifts focus to quantum critical points or phases that exhibit nontrivial topological properties. Here we explore a cluster-Ising chain with long-range antiferromagnetic interactio...
Besides establishing a paradigmatic case to break the incompatibility of the LCTs and the TCTs in non‐Hermitian systems, the both availabilities of the sensitive critical feature and the robust topological feature can also provide more potential for designing quantum devices orsensors. 展开 关键词:...
a significant advancement was made by introducing the periodic gain/loss into a two-dimensional system comprising 48 waveguides, the evidence of the existence of a non-Hermitian topological insulator with a real-valued energy spectrum has been presented in a Floquet regime, as shown in Fig.118. ...
Unconventional properties of non-Hermitian systems, such as the existence of exceptional points, have recently been suggested as a resource for sensing. The impact of noise and utility in quantum regimes however remains unclear. In this work, we analyze
Non-Hermitian effects can be used to enhance the parameter sensitivity of a system and thus improve metrology applications. Here, the authors present an asymmetric non-Hermitian tight-binding chain where the quantum Fisher information increases exponentially with the system size. ...
nearest-neighbourith andith + 1 dots,Uiis the on-site Coulomb interaction term,Vi,jis the intersite Coulomb interaction terms between theith andjth dots,\({c}_{i}^{\dagger }\)(ci) are the creation (annihilation) operator of a particle on siteiand h.c. indicates Hermitian ...
Quantum-enhanced measurements hold the promise to improve high-precision sensing ranging from the definition of time standards to the determination of fundamental constants of nature. However, quantum sensors lose their sensitivity in the presence of noi
Evanescently coupled pairs of microdisk lasers have emerged as a useful platform for studying the non-Hermitian physics of exceptional points. It remains an open question how scalable and versatile such phenomena can be when carried over to other designs