Integrated Quantum Technology

Within its research area Integrated Quantum Technology, FBH carries out R&D activities that aim at bringing quantum technology (QT) from proof-of-concept demonstrations in a quantum optics lab to industry, so as to pave the way for the second quantum revolution to unfold its potential for tomorrow’s society. Applications include quantum sensing, quantum communication, quantum simulation, and quantum computing.

FBH builds on its core competencies, III-V semiconductor, microwave and diode laser technology, and extends its portfolio where necessary. In order to account for the fact that QT currently features an early technology readiness level and related research – to a large extent – is still fundamental, FBH teams up with university partners in order to cover the full value chain, from concept development and demonstration through technology development all the way to the final components and subsystems. In specific cases, FBH even develops systems that enable operation in a realistic environment, i.e., in the field or in space.

FBH research currently focuses on the following topics:

Quantum photonic components – here, the research focuses on the development of electro-optical components and hybrid micro-integrated modules that provide coherent radiation required, e.g., for the implementation of quantum optical sensors or quantum computers based on cold ions or neutral atoms. Emphasis lays on narrow and ultra-narrow linewidth lasers also relevant for coherent free-space communication and laser metrology. The activities include R&D for space applications.

Integrated quantum sensors – here the research focuses on the development of integrated quantum sensors using high-precision spectroscopy techniques with atomic or molecular ensembles either at room temperature or, by laser cooling, near absolute zero. Here, the intrinsic properties of quantum mechanical states and their precise manipulation with laser light are exploited to realize instruments for highly accurate measurements of physical quantities such as frequency, accelerations, electric or magnetic fields. The activities include R&D for space applications.

Diamond nanophotonics - here, the research focuses on nanostructured diamond systems and materials and aims at developing novel concepts for guiding, catching, and manipulating light on the nano- and microscale, and enabling strong light–matter interaction in diamond with the goal to efficiently couple, or more precisely, to entangle single quantum memories with single photons. Quantum memory–photon entanglement as well as quantum gates will then build the basis for the implementation of future quantum communication platforms that are more secure and versatile than present classical schemes.

Photonic quantum technologies – here, the research focuses on combining two of the most recent breakthroughs at the frontiers of quantum optics and nanophotonics: ultra-strong quantum optical nonlinearities provided by quantum emitters and nanofabricated optical waveguide chips that permit high-level control of light propagation at the wavelength scale. This aims at laying the foundations for future technology built on scalable quantum nonlinear devices, such as nondestructive photon-number-resolving detectors, configurable photon-number-specific filters and sorters, as well as analyzers for entangled photon states.