Quantum Optics with Hybrid Quantum Systems
waksdiag_small
In this activity, researchers will investigate methods to transfer coherence and create entanglement between quantum states of light and various forms of matter. Such a versatile light-matter quantum interface may be used to form entangled links between disparate matter qubits, such as atoms and  semiconductor quantum dots. This activity may lead to novel quantum information devices that can exploit advantages of different quantum systems, while shedding light on natural decoherence mechanisms in condensed matter systems and offering an intriguing method for scaling atomic systems.

The study of quantum coherence and entanglement has conventionally involved ensembles of identical and well-controlled two-level systems and their interactions with classical reservoirs. We will push beyond this standard  approach and investigate hybrid quantum systems that are composed of two or more different types of quantum materials, with photonic interactions threading the various systems. Hybrid quantum systems may allow us to exploit different quantum systems for particular functions, to investigate decoherence of one system with respect to another, and to build complex many-body quantum states in a controlled manner.

Hybrid quantum systems are expected to play crucial roles in the development of future quantum information hardware. Some quantum systems are appropriate for the long-term storage of quantum information, while others offer strong interactions for the operation of fast quantum gates. Still others can effectively relay quantum information over long distances.

waks_beamsplit_small
Researchers will conduct a broad investigation of the interconversion of quantum coherence and quantum information from matter systems, such as semiconductors and atoms, to photonic systems. The long lifetimes of atomic systems make them excellent candidates for quantum memory, while solid state systems have fast temporal dynamics and strong nonlinear interactions that are ideal for quantum gates. We will also investigate methods for using photonic systems as quantum interconnects between semiconductor and atomic quantum systems. The interplay between these different systems will enable new quantum technology, and may shed light on important fundamental concepts such as nonlocal entanglement and quantum decoherence in various contexts.