High-bandwidth transfer of phase stability through a fiber frequency comb

Abstract

We demonstrate phase locking of a 729 nm diode laser to a 1542 nm master laser via an erbium-doped-fiber frequency comb, using a transfer-oscillator feedforward scheme which suppresses the effect of comb noise in an unprecedented 1.8 MHz bandwidth. We illustrate its performance by carrying out coherent manipulations of a trapped calcium ion with 99 % fidelity even at few-microsecond timescales. We thus demonstrate that transfer-oscillator locking can provide sufficient phase stability for high-fidelity quantum logic manipulation even without pre-stabilization of the slave diode laser.

6 pages, 3 figures. To be published in Optics Express. Clarified method for measuring laser noise spectra. Improved spectroscopic data in Fig. 3, with motional decoherence now suppressed

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