Photonic Quantum Engineering - Research
Group leader: Prof. Dr. Kai Mueller
research focusses on the photonic quantum engineering of building
blocks which are essential for all areas of quantum science and
technology. This spans the entire range from fundamental quantum
optical studies over the development of devices to demonstrator
experiments. At its heart lies investigating the light-matter
interaction in nanostructures in order to tailor it for emerging
applications in quantum communication, quantum simulation, quantum
metrology and quantum sensing. Specific research areas are:
optics with semiconductor nanostructures
light-matter interactions for quantum technologies requires a
detailed understanding of the underlying quantum materials as well as
the development of novel quantum-optical techniques and protocols.
Therefore, we perform quantum-optical experiments on a variety of
quantum emitters and optically-active spin qubits such as
semiconductor quantum dots, color centers in diamond, quantum
emitters in atomically thin transition metal dichalcogenides or
rare-earth ions. Moreover, we develop novel quantum-optical
techniques for example for the generation of non-classical light or
the ultrafast optical coherent control of qubits.
Examples of investigated material systems. Left: Semiconductor Quantum Dot.
Right: Monolayer transition metal dichalcogenide embedded in a microcapacitor.
order to enhance the light-matter interaction and for efficient
photonic interfacing of quantum emitters and optically-active spin
qubits we embed them into nanophotonic resonators and circuits. Here,
we actively perform research on engineering a variety of structures,
such as photonic crystals, micropillar resonators, bullseye
resonators and waveguides based on a variety of material systems such
as III-V semiconductors, diamond and silicon nitride.
Photonic Quantum Technologies
quantum technologies require the combination of several building
blocks. To these ends, we are developing fully fiber-coupled quantum
modules which can then conveniently combined to enable a variety of
applications. Such modules are realized by building on the best
suitable quantum materials and nanophotonic structures. Examples of
the modules we are developing include non-classical light sources,
spin-photon interfaces, single-photon detectors and quantum memories.
Quantum Photonic Circuits
addition to modular distributed quantum technologies, different
building blocks, such as sources, gates and detectors can also be
integrated into chip-scale quantum photonic circuits to enable novel
functionality. Here, a particular emphasis of our research is to
investigate material systems, techniques and protocols which promise
gratefully acknowledge funding from the Federal Ministry of Education
and Research (BMBF), the German Science Foundation (DFG), the Munich
Center for Quantum Science and Technology (MCQST), the Bavarian
Academy of Sciences and Humanities (BAdW) and the European Union.