The topological properties of an object, associated with an integer called the topological
invariant, are global features that cannot change continuously but only through abrupt …

Reciprocity is a fundamental principle in optics, requiring that the response of a transmission
channel is symmetric when source and observation points are interchanged. It is of major …

In the field of quantum simulation of condensed matter phenomena by artificially
engineering the Hamiltonian of an atomic, molecular or optical system, the concept of …

We demonstrate that nanoparticle self-assembly can reach the same level of hierarchy,
complexity, and accuracy as biomolecules. The precise assembly structures of gold …

Topological photonics is a rapidly emerging field of research in which geometrical and
topological ideas are exploited to design and control the behavior of light. Drawing …

Nonreciprocal components, such as isolators and circulators, provide highly desirable
functionalities for optical circuitry. This motivates the active investigation of mechanisms that …

Synthetic magnetism has been used to control charge neutral excitations for applications
ranging from classical beam steering to quantum simulation. In optomechanics, radiation …

Entanglement of light and multiple vibrations is a key resource for multichannel quantum
information processing and memory. However, entanglement generation is generally …

Integrated nonreciprocal optical components, which have an inherent asymmetry between
their forward and backward propagation direction, are key for routing signals in photonic …

Topological states of matter are particularly robust, since they exploit global features of a
material's band structure. Topological states have already been observed for electrons …