Precision spectroscopy with two correlated atoms

Abstract

We discuss techniques that allow for long coherence times in laser spectroscopy experiments with two trapped ions. We show that for this purpose not only entangled ions prepared in decoherence-free subspaces can be used but also a pair of ions that are not entangled but subject to the same kind of phase noise. We apply this technique to a measurement of the electric quadrupole moment of the 3d D5/2 state of 40Ca+ and to a measurement of the linewidth of an ultrastable laser exciting a pair of 40Ca+ ions.

References in corpus (7)

• Scalable multi-particle entanglement of trapped ions
• 'Designer atoms' for quantum metrology
• Observation of the 1S0 - 3P0 clock transition in 27Al+
• How to realize a universal quantum gate with trapped ions
• Quadrupole moments and hyperfine constants of metastable states of Ca${}^{+}$, Sr${}^{+}$, Ba${}^{+}$, Yb${}^{+}$, Hg${}^{+}$, and Au
• Precision spectroscopy with two correlated atoms
• Precision frequency measurements with entangled states

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