Sensing Atomic Motion from the Zero Point to Room Temperature with Ultrafast Atom Interferometry

Abstract

We sense the motion of a trapped atomic ion using a sequence of state-dependent ultrafast momentum kicks. We use this atom interferometer to characterize a nearly-pure quantum state with $n=1$ phonon and accurately measure thermal states ranging from near the zero-point energy to $\bar{n}\sim 10^4$, with the possibility of extending at least 100 times higher in energy. The complete energy range of this method spans from the ground state to far outside of the Lamb-Dicke regime, where atomic motion is greater than the optical wavelength. Apart from thermometry, these interferometric techniques are useful for characterizing ultrafast entangling gates between multiple trapped ions.

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• Rapid Quantum Squeezing by Jumping the Harmonic Oscillator Frequency
• Trapped electrons and ions as particle detectors
• Experimental apparatus for overlapping a ground-state cooled ion with ultracold atoms
• Continuous variables quantum computation over the vibrational modes of a single trapped ion
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• Suppressed spontaneous emission for coherent momentum transfer
• Three-dimensional matter-wave interferometry of a trapped single ion
• Absolute Single Ion Thermometry
• Fast mixed-species quantum logic gates for trapped-ion quantum networks
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• High-speed and high-connectivity two-qubit gates in long chains of trapped ions
• Thermometry of Trapped Ions Based on Bichromatic Driving
• Error-Resilient Fast Entangling Gates for Scalable Ion-Trap Quantum Processors