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A programmable trapped-ion quantum computer

March 5, 2018 - 11:00am
Norbert Linke

Abstract: Trapped ions are a promising candidate system to realize a scalable quantum computer. We present a modular quantum computing architecture comprised of a linear chain of 171Yb+ ions with individual Raman beam addressing and individual readout [1]. Entangling gates between any qubit pair are implemented by using the motional modes in the chain. This creates a fully connected system which can be configured to run any sequence of single- and two-qubit gates, making it in effect an arbitrarily programmable quantum computer that does not suffer any swap-gate overhead [2]. 
Recent results from different quantum algorithms will be presented, including a measurement of the second Renyi entropy of a two-site Fermi-Hubbard model [3]. I will also discuss ideas for scaling up, including long-range quantum networking with entangled photons.
Additionally, the high degree of experimental control achieved can be used to study Boson physics and systems of phonon-polaritons using the local motional modes of trapped ions. I will show initial results and future prospects for this new research direction.
[1] S. Debnath et al., Nature 563, 63 (2016).
[2] NML et al., PNAS 114 13:3305 (2017).
[3] NML et al., arXiv:1712.08581 (2017).

PSC 2136
College Park, MD 20742