Phase-coherent detection of an optical dipole force by Doppler velocimetry

Abstract

We report phase-coherent Doppler detection of optical dipole forces using large ion crystals in a Penning trap. The technique is based on laser Doppler velocimetry using a cycling transition in ${}^9$Be${}^{+}$ near 313 nm and the center-of-mass (COM) ion motional mode. The optical dipole force is tuned to excite the COM mode, and measurements of photon arrival times synchronized with the excitation potential show oscillations with a period commensurate with the COM motional frequency. Experimental results compare well with a quantitative model for a driven harmonic oscillator. This technique permits characterization of motional modes in ion crystals; the measurement of both frequency and phase information relative to the driving force is a key enabling capability -- comparable to lockin detection -- providing access to a parameter that is typically not available in time-averaged measurements. This additional information facilitates discrimination of nearly degenerate motional modes.

Related manuscripts at http://www.physics.usyd.edu.au/~mbiercuk/

References in corpus (5)

• Scalable multi-particle entanglement of trapped ions
• Quantum Teleportation Between Distant Matter Qubits
• Ultrasensitive force and displacement detection using trapped ions
• Ultrafast Gates for Single Atomic Qubits
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Cited by in corpus (5)

• Amplitude sensing below the zero-point fluctuations with a two-dimensional trapped-ion mechanical oscillator
• Trapped-Ion State Detection through Coherent Motion
• Detection of motional ground state population of a trapped ion using delayed pulses
• All-Optical Broadband Excitation of the Motional State of Trapped Ions
• In-situ-tunable spin-spin interactions in a Penning trap with in-bore optomechanics