**Colloquium: Thursday, February 15, 4:10 PM, Lewis Lab 316**

**There and Back Again with Trapped-Ions**

**Arghavan Safavi-Naini**

Postdoctoral Researcher

JILA, NIST, UC Boulder

One of the most important goals of modern quantum sciences is to learn how to control and entangle many-body systems and use them to make powerful and improved quantum devices, materials and technologies. The challenge lies in the complexity of quantum many-body systems and the emergence of entanglement and quantum correlations. In this talk I will introduce a quantum simulator, composed of a 2D crystal of ~100 trapped-ions in a Penning trap which can overcome this challenge by “simulating” the behavior of paradigmatic spin and spin-boson models. Moreover, this simulator gives us the power to travel backwards in time and measure a family of out-of-time-order correlators (OTOCs). These correlators provide a measure for the butterfly effect in quantum systems and allow us to directly probe the dynamics of correlations, coherences, and the scrambling of quantum information. These measurement not only impact quantum information processing and quantum enhanced metrology, but may open a path for future tests of the holographic duality between quantum and gravitational systems.

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Physics and Astronomy Colloquia are usually scheduled for Thursdays at 4:10 PM in Lewis Lab room 316. Refreshments and snacks are available in the nearby coffee room at 3:45 PM.

**Physics Colloquium Schedule for SPRING 2018**

**Click on Title below for past or upcoming Announcements (where available), and Speaker name for website. ** ** **