CQuIC Seminars
Quantum simulation experiments with 2D arrays of hundreds of trapped ions (1)
Presented by John Bollinger, NIST
Systems of trapped ions have made substantial progress in simulating quantum magnetic models. As the number of spins in the simulation increases, the number of measurements required to fully characterize the density matrix of the output state exponentially grows. Therefore, efficient methods for measuring quantum signatures are needed to effectively identify, categorize, and quantify entangled spin states. Here we perform quantum simulations of an Ising spin model employing 9Be+ ions in a Penning trap, capable of producing entangled states in planar arrays of hundreds of spins. To benchmark quantum effects generated by an engineered Ising interaction, we generate spin-squeezed states [2]. In addition, we characterize over-squeezed, non-Gaussian collective spin states, where spin-squeezing fails to identify entanglement, with a more general entanglement witness using the quantum Fisher information [3]. Finally, we present results from a Loschimdt echo sequence that can observe many-body spin correlations from the multiple quantum coherence spectrum [4]. In the future, we will apply these benchmarking techniques to simulations of non-trivial spin models, such as the XY model and the transverse field Ising model with variable range interactions.
[1] in collaboration with J.G. Bohnet, B.C. Sawyer (GTRI), J.W. Britton (ARL), and the A.M. Rey group (JILA).
[2] J. Bohnet, et al., Science, 352, (2016).
[3] H. Strobel, et al., Science 345, (2014).
[4] M. Gaerttner, et al., arXiv:1608.08938.
3:30 pm, Thursday, September 29, 2016
PAIS-2540, PAIS
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