Precision measurement and compensation of optical Stark shifts for an ion-trap quantum processor
Abstract
Using optical Ramsey interferometry, we precisely measure the laser-induced AC-stark shift on the S1/2 -- D5/2 "quantum bit" transition near 729 nm in a single trapped 40Ca+ ion. We cancel this shift using an additional laser field. This technique is of particular importance for the implementation of quantum information processing with cold trapped ions. As a simple application we measure the atomic phase evolution during a n × 2π rotation of the quantum bit.
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