2011/03/31 by Andreas Walther, Ulrich Poschinger, Frank Ziesel +8 · 1 citation
Computer Science · Physics and Astronomy · #Atomic and Subatomic Physics Research #Atomic physics #Computer science #Condensed matter physics #Dephasing #Ion #Ion trap #Magnetic field #Noise (video) #Physics #Quantum #Quantum Information and Cryptography #Quantum mechanics #Quantum optics and atomic interactions #Qubit #quant-ph
paper · pdf · doi:10.1103/physreva.83.062329
published as Physical Review A 83, 062329 (2011) · 5 pages, 3 figures
openalex publication_date 2011/06/23 · arxiv created 2011/06/28 · arxiv updated 2015/05/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
It is expected that ion-trap quantum computing can be made scalable through protocols that make use of transport of ion qubits between subregions within the ion trap. In this scenario, any magnetic field inhomogeneity the ion experiences during the transport may lead to dephasing and loss of fidelity. Here we demonstrate how to measure, and compensate for, magnetic field gradients inside a segmented ion trap, by transporting a single ion over variable distances. We attain a relative magnetic field sensitivity of \ensuremathΔB/B0~5\ifmmode×\else\texttimes\fi10^\ensuremath-7 over a test distance of 140 \ensuremathμm, which can be extended to the mm range, still with sub-\ensuremathμm resolution. A fast experimental sequence is presented, facilitating its use as a magnetic-field-gradient calibration routine, and it is demonstrated that the main limitation is the quantum shot noise.