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PreprintCC BY 4.0arXiv

Imaginary magnetic fields for ultracold atoms

  • Saulius Alminas
  • Domantas Burba
  • Gediminas Juzeliūnas
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Abstract

We propose a four-level scheme for generating a uniform imaginary magnetic field for ultracold atoms using Raman coupling and state-dependent particle losses. Eliminating two lossy auxiliary states and subsequently projecting onto one of the two remaining Raman-dressed atomic states, we find that the atomic motion is affected by an imaginary vector potential which is engineered to have a constant curl corresponding to a spatially uniform imaginary synthetic magnetic field. We analytically derive the Gaussian wavepacket dynamics for atoms in such a synthetic magnetic field and study the width-dependent transport, unlike motion in a uniform real magnetic field. We find numerical agreement between the two-level non-Hermitian Hamiltonian and the adiabatic projection description, confirming the applicability of the latter adiabatic approach.

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Cite

BibTeXRIS
BibTeX
@misc{alminas2026imaginary,
  title = {{Imaginary magnetic fields for ultracold atoms}},
  author = {Saulius Alminas and Domantas Burba and Gediminas Juzeliūnas},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.06793},
  eprint = {2610.06793},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.06793},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Imaginary magnetic fields for ultracold atoms
AU  - Saulius Alminas
AU  - Domantas Burba
AU  - Gediminas Juzeliūnas
PY  - 2026
DA  - 2026/10/12
PB  - arXiv
DO  - 10.48550/arxiv.2610.06793
UR  - https://arxiv.org/abs/2610.06793
AB  - We propose a four-level scheme for generating a uniform imaginary magnetic field for ultracold atoms using Raman coupling and state-dependent particle losses. Eliminating two lossy auxiliary states and subsequently projecting onto one of the two remaining Raman-dressed atomic states, we find that the atomic motion is affected by an imaginary vector potential which is engineered to have a constant curl corresponding to a spatially uniform imaginary synthetic magnetic field. We analytically derive the Gaussian wavepacket dynamics for atoms in such a synthetic magnetic field and study the width-dependent transport, unlike motion in a uniform real magnetic field. We find numerical agreement between the two-level non-Hermitian Hamiltonian and the adiabatic projection description, confirming the applicability of the latter adiabatic approach.
ER  -