Travis Nicholson Group

Ultracold strontium trapped in optical lattice potentials is the basis for the world's best atomic clocks. Meanwhile ultracold atoms in Rydberg states have realized high-fidelity quantum gates. We aim to combine these two approaches to realize many-qubit quantum logic with high fidelity. With single-site spatial resolution, mHz-level spectroscopy, and tunable long-range interactions (achieved with Rydberg dressing), we can use degenerate strontium in optical lattices for quantum logic with minimal error. We are also interested in using Rydberg dressing to generate squeezed states that can beat the standard quantum limit to measurement precision.

More information at our homepage:

Travis Nicholson is a Principal Investigator at the Centre for Quantum Technologies and an Assistant Professor of Physics at NUS. He is an experimental physicist who uses ultracold atoms to study quantum optics, quantum metrology, and quantum many-body physics. He performed his PhD research at JILA in the United States. His PhD thesis demonstrated the world's most accurate atomic clock, which neither gains nor loses a second in 15 billion years. After this he was a postdoctoral fellow at MIT, studying nonlinear quantum optics with Rydberg atoms. Travis joined the CQT in 2017.

Group Members

Recent papers

  • J.D. Thompson, T.Nicholson, Q.-Y. Liang, S.H. Cantu, A.V. Venkatramani, S. Choi, I.A. Fedorov, D. Viscor, T. Pohl, M.D. Lukin, V. Vuletic. (2017). Symmetry-protected collisions between strongly interacting photons. Nature 542 206
  • S.L. Bromley, B. Zhu, M. Bishof, X. Zhang, T. Bothwell, J. Schachenmayer, T.Nicholson, R. Kaiser, S.F. Yelin, M.D. Lukin, A.M. Rey, J. Ye. (2016). Collective atomic scattering and motional effects in a dense coherent medium. Nature Communications 7 11039
  • T.Nicholson, S. Blatt, B.J. Bloom, J.R. Williams, J. Ye, P.S. Julienne. (2015). Optical Feshbach resonances: Field-dressed theory and experimental comparisons. Phys. Rev. A 92 022709
  • B.J. Bloom, T.Nicholson, J.R. Williams, S.L. Campbell, M. Bishof, X. Zhang, W. Zhang, S.L. Bromley, J. Ye. (2012). An optical lattice clock with accuracy and stability at the 1e-18 level. Nature 506 71
  • T.Nicholson, M.J. Martin, J.R. Williams, B.J. Bloom, M. Bishof, M.D. Swallows, S.L. Campbell, J. Ye. (2012). Comparison of two independent Sr optical clocks with 1e-17 stability at 10^3 s. Phys. Rev. Lett. 107 073202
  • S. Blatt, T.Nicholson, B.J. Bloom, J.R. Williams, J.W. Thomsen, P.S. Julienne, J. Ye. (2011). Measurement of optical Feshbach resonances in an ideal gas. Phys. Rev. Lett. 107 073202
  • G.K. Campbell, M.M. Boyd, J.W. Thomsen, M.J. Martin, S. Blatt, M.D. Swallows, T.Nicholson, T. Fortier, C.W. Oates, S.A. Diddams, N.D. Lemke, P. Naidon, P. Julienne, J. Ye, A.D. Ludlow. (2009). Probing interactions between ultracold fermions. Science 324 360
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