Second-Scale $^9\text{Be}^+$ Spin Coherence in a Compact Penning Trap
- URL: http://arxiv.org/abs/2110.03053v1
- Date: Wed, 6 Oct 2021 20:20:04 GMT
- Title: Second-Scale $^9\text{Be}^+$ Spin Coherence in a Compact Penning Trap
- Authors: Brian J. McMahon and Brian C. Sawyer
- Abstract summary: We report microwave spectroscopy of co-trapped $9textBe+$ and $40textCa+$ within a compact permanent-magnet-based Penning ion trap.
The trap is constructed with a reconfigurable array of NdFeB rings providing a 0.654 T magnetic field that is near the 0.6774-T magnetic-field-insensitive hyperfine transition.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We report microwave spectroscopy of co-trapped $^9\text{Be}^+$ and
$^{40}\text{Ca}^+$ within a compact permanent-magnet-based Penning ion trap.
The trap is constructed with a reconfigurable array of NdFeB rings providing a
0.654 T magnetic field that is near the 0.6774-T magnetic-field-insensitive
hyperfine transition in $^9\text{Be}^+$. Performing Ramsey spectroscopy on this
hyperfine transition, we demonstrate nuclear spin coherence with a contrast
decay time of >1 s. The $^9\text{Be}^+$ is sympathetically cooled by a Coulomb
crystal of $^{40}\text{Ca}^+$, which minimizes $^9\text{Be}^+$ illumination and
thus mitigates reactive loss. Introducing a unique high-magnetic-field optical
detection scheme for $^{40}\text{Ca}^+$, we perform spin state readout without
a 729~nm shelving laser. We record a fractional trap magnetic field instability
below 20 ppb (<13 nT) at 43 s of averaging time with no magnetic shielding and
only passive thermal isolation. We discuss potential applications of this
compact, reconfigurable Penning trap.
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