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Thursday, October 15, 2020, 10 a.m. MDT | Online

Engineered quantum systems have the potential to revolutionize sensing, communication, and computation. To realize this potential it is necessary to scale the control and connectivity of these systems without sacrificing coherence. In this webinar hosted by the Quantum Optical Science and Technology Technical Group, Sara Mouradian of the University of California, Berkeley, will discuss how integrated photonics can increase control and connectivity in quantum systems built of solid state qubits in diamond and trapped-ion qubits.

Who should attend:

• Physicists who are interested in how engineering can increase their capabilities.
• Integrated photonics experts who are interested in how IPCs will help the next generation of quantum systems.

Thursday, October 15, 2020, 12 p.m. | Online

• Speaker: Dima Farfurnik, University of Maryland
• Host: Dan Dessau

The experimental discovery of the fractionalized Hall conductivity revealed new types of quantum particles beyond bosons and fermions. These anyons are usually studied deep inside a topological phase. But can such fractionalization be detected at the phase transition point to a conventional phase? To answer this question, we study a quantum phase transition between a topological state called a Z_2 spin liquid and a conventional superfluid on the Kagome lattice using large-scale quantum Monte Carlo simulations.

Our results show that the conductivity at the quantum critical point becomes a simple fraction of its value at the conventional insulator-to-superfluid transition. We explain our findings using conformal field theory. Our work opens the door for the experimental detection of anyons in a broader regime, and has ramifications for the study of quantum materials and ultra-cold atomic gases.