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Events on Monday, February 6th, 2023

Atomic Physics Seminar
Beyond quantum circuits with trapped-ion qubits
Time: 11:00 am
Place: 5310 Chamberlin Hall
Speaker: Or Katz, Duke University
Abstract: Trapped ions are a leading quantum technology for quantum computation and simulation, with the capability to solve computationally hard problems and deepen our understanding of complex quantum systems. The quantum circuit model is the central paradigm for quantum computation, enabling the realization of various quantum algorithms by application of multiple one- and two-qubit entangling operations. However, the typical number of entangling operations required by this model increases exponentially with the number of qubits, making it difficult to apply to many problems.
In my presentation, I will discuss new methods for realizing quantum gates and simulations that go beyond the quantum circuit model. I will first describe a single-step protocol for generating native, N-body interactions between trapped-ion spins, using spin-dependent squeezing. Next, I will present a preparation of novel phases of matter using simultaneous and reconfigurable spin-spin interactions. Lastly, I will explore new avenues to harness the long-lived phonon modes in trapped-ion crystals for simulating complex bosonic and spin-boson models that are difficult to solve using classical methods. The presented techniques could push the performance of trapped-ion systems to solve problems that are currently beyond their reach.
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Plasma Physics (Physics/ECE/NE 922) Seminar
The Eulerian space-time correlation of magnetohydrodynamic turbulence and the analysis of Parker Solar Probe measurements
Time: 12:00 pm
Place: 2241 Chamberlin Hall
Speaker: Jean Carlos Perez, Florida Institute of Technology
Abstract: Understanding the Eulerian space-time correlation of magnetohydrodynamic (MHD) turbulence, as well as its possible universal properties, is of critical importance in the analysis and interpretation of solar wind measurements when the Taylor hypothesis is not valid. This so-called frozen-in-flow hypothesis posits that the temporal variation of spacecraft signals is solely due to the spatial variation of a frozen structure passing by the observation point, in which case the turbulence dynamics can essentially be considered to be frozen in the plasma frame. The Parker Solar Probe (PSP) mission, launched in 2018, is presently probing the near-Sun solar wind with an orbit that will reach its point of closest approach next year at a heliospheric radius of approximately 0.045 au, which is seven times closer than any previous mission. During each close encounter with the Sun, the assumptions supporting TH are expected to break down. In this talk, I will discuss a recent semi-phenomenological model of the Eulerian two-time two-point (space-time) correlation for incompressible MHD turbulence and its impact on the interpretation of PSP data. Using this model we introduce a methodology that allows one to reconstruct the reduced energy spectrum of magnetic fluctuations vs spatial wavenumber from the frequency spectrum of fluctuations measured by PSP near the Alfven critical point, where TH is expected to break down.  

Host: Stanislav Boldyrev
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