Ultracold Gases & Nanophotonics
Non-Abelian Gauge Field

Non-Abelian Gauge Field

Non-Abelian Gauge Field

We explore quantum simulations mimicking Hamiltonians with an artificial gauge field. While most research in the ultracold atoms community focuses on lattices, to address Hubbard-like Hamiltonians for condensed-matter problems, we followed an alternative path generating gauge fields for bulk systems. Apart from its simplicity, this approach gives more diversity in gauge field structures and symmetries and allows addressing problems ranging from quantum information to high-energy physics. A first experiment was dedicated to non-Abelian transformations to create geometrical qubits, which are known to be less prone to errors than normal qubits [1]. We then explored the matter-wave dynamic in SU(2) symmetry and found an elegant generalization of the Zitterbewegung relativistic effect in a two-dimensional non-Abelian gauge field[2], [3]. To create our artificial SU(2) gauge field, we suggested a so-called tripod scheme: a generalization of the celebrated Λ-scheme, used in electromagnetic-induced transparency. We extended the application domain of the tripod scheme, created an atomic Datta-Das transistor for atomtronic circuits [4], and proposed a new test of the Born rules [5]. We proposed a further extension of the tripod scheme to address SU(3) symmetry problems [6] that we are currently implementing in one of our experiments.
Figure: (a) Tripod scheme. Black arrow indicates tripod beams, red arrows indicate spin-sensitive imaging system and purple arrows indicate doppler cooling in the far-off resonant trap. (b) Arrangement of the tripod beam.
Ground state population evolution during Ballistic expansion of a cold gas in presence of the non-Abelian gauge field.

[1]      F. Leroux et al., “Non-Abelian adiabatic geometric transformations in a cold strontium gas,” Nat. Commun., vol. 9, no. 1, p. 3580, Dec. 2018, doi: 10.1038/s41467-018-05865-3.

[2]      M. Hasan, C. Madasu, C. C. Kwong, F. Chevy, and D. Wilkowski, “APS -51st Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics – Event – Dynamics of Quantum Gas in Non-Abelian Gauge Field,” in Bulletin of the American Physical Society, vol. Volume 65, Number 4. Accessed: May 26, 2021. [Online]. Available: https://meetings.aps.org/Meeting/DAMOP20/Session/T08.5

[3]      M. Hasan  C. Madasu, K. Rathod, C. C. Kwong, C. Miniatura, F. Chevy and D. Wilkowski , “Anisotropic Zitterbewegung Dynamics in Synthetic Non-Abelian Gauge Fields”  arXiv

[4]      C. Madasu, K. Rathod, M. Hasan, C. C. Kwong, and D. Wilkowski, “Datta-Das transistor for atomtronic circuits using artificial gauge fields,” arXiv.

[5]      K. S. Lee, Z. Zhuo, C. Couteau, D. Wilkowski, and T. Paterek, “Atomic test of higher-order interference,” Phys. Rev. A, vol. 101, no. 5, p. 052111, May 2020, doi: 10.1103/PhysRevA.101.052111.

[6]      Y.-X. Hu, C. Miniatura, D. Wilkowski, and B. Grémaud, “U(3) artificial gauge fields for cold atoms,” Phys. Rev. A, vol. 90, no. 2, p. 023601, Aug. 2014, doi: 10.1103/PhysRevA.90.023601.