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• CQT PhD Thesis Defense by Ding Shiqian - 15 Dec, 03:00 PM

CQT PhD Thesis Defense by Ding Shiqian
Title: Control of Trapped-Ion Motion for Molecular Spectroscopy and Quantum Information Processing
Date/Time: 15 Dec, 03:00 PM
Venue: CQT Level 3 Conference Room, S15-03-18
Abstract: Control and manipulation of trapped-ion motion are basic building blocks for quantum information processing and precision measurement with trapped ions. In this thesis, I present several techniques aimed at the nondestructive state detection of molecular ions and quantum information processing.

I will present a proposal to prepare, detect and manipulate the state of a molecular ion using quantum logic techniques[1][2], and its experimental validation in a proof-of-principle experiment with two different isotopes of Yb.

I will also describe our experiment to control the motion of a trapped atomic ion using microwave radiation assisted by a running optical lattice[3]. The spin-motion coupling is exploited to demonstrate sideband cooling of a Yb ion to the ground state of motion.

Finally, I will discuss the coupling between two normal modes of a two-ion crystal that is formally analogous to the process of the optical down-conversion[4]. It is exploited to demonstrate phonon down-conversion (up-conversion) at the single quanta level. This coupling allows us to directly measure the parity and Wigner function of the ions' motional state.

[1]Ding, S. and Matsukevich, D. N., New J. Phys. 023028 (2012)
[2]Loh, H., et al., Phys. Rev. A. 90, 061402 (R) (2014)
[3]Ding, S., et al., Phys. Rev. Lett. 113, 073002 (2014)
[4]Ding, S., et al., arXiv:1512.01670 (2015)

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