Rotational magic conditions for ultracold molecules in the presence of Raman and Rayleigh scattering

• URL: http://arxiv.org/abs/2310.16215v3
• Date: Thu, 25 Apr 2024 21:37:57 GMT
• Title: Rotational magic conditions for ultracold molecules in the presence of Raman and Rayleigh scattering
• Authors: Svetlana Kotochigova, Qingze Guan, Eite Tiesinga, Vito Scarola, Brian DeMarco, Bryce Gadway,
• Abstract summary: We show that efficient trapping of a molecule in its vibrational ground state can be achieved by selecting a laser frequency with a detuning on the order of tens of GHz. We demonstrate that magic trapping conditions for multiple rotational states of the ultracold $23$Na$87$Rb polar molecule can be created.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Molecules have vibrational, rotational, spin-orbit and hyperfine degrees of freedom or quantum states, each of which responds in a unique fashion to external electromagnetic radiation. The control over superpositions of these quantum states is key to coherent manipulation of molecules. For example, the better the coherence time the longer quantum simulations can last. The important quantity for controlling an ultracold molecule with laser light is its complex-valued molecular dynamic polarizability. Its real part determines the tweezer or trapping potential as felt by the molecule, while its imaginary part limits the coherence time. Here, our study shows that efficient trapping of a molecule in its vibrational ground state can be achieved by selecting a laser frequency with a detuning on the order of tens of GHz relative to an electric-dipole-forbidden molecular transition. Close proximity to this nearly forbidden transition allows to create a sufficiently deep trapping potential for multiple rotational states without sacrificing coherence times among these states from Raman and Rayleigh scattering. In fact, we demonstrate that magic trapping conditions for multiple rotational states of the ultracold $^{23}$Na$^{87}$Rb polar molecule can be created.

Related papers

• Long-lived entanglement of molecules in magic-wavelength optical tweezers [41.94295877935867]
  We present the first realisation of a microwave-driven entangling gate between two molecules. We show that the magic-wavelength trap preserves the entanglement, with no measurable decay over 0.5 s. The extension of precise quantum control to complex molecular systems will allow their additional degrees of freedom to be exploited across many domains of quantum science.
  arXiv  Detail & Related papers  (2024-08-27T09:28:56Z)
• Enhanced quantum control of individual ultracold molecules using optical tweezer arrays [44.99833362998488]
  Control over the quantum states of individual molecules is crucial in the quest to harness their rich internal structure and dipolar interactions. We develop a toolbox of techniques for the control and readout of individually trapped polar molecules in an array of optical tweezers.
  arXiv  Detail & Related papers  (2024-01-24T17:00:39Z)
• Floquet Engineering of a Diatomic Molecule Through a Bichromatic Radiation Field [0.0]
  We report on a theoretical study of a Cs$$ molecule illuminated by two lasers. We reveal that these interactions facilitate the bypass of the non-crossing rule. We discuss extensively how the interaction of radiation with matter gives rise to the emergence of potential energy surfaces.
  arXiv  Detail & Related papers  (2023-11-22T21:14:52Z)
• Dipolar spin-exchange and entanglement between molecules in an optical tweezer array [0.0]
  Ultracold polar molecules are promising candidate qubits for quantum computing. Using a molecular optical tweezer array, single molecules can be moved and separately addressed for qubit operations. We demonstrate a two-qubit gate to generate entanglement deterministically, an essential resource for all quantum information applications.
  arXiv  Detail & Related papers  (2022-11-17T18:53:42Z)
• High-resolution 'magic'-field spectroscopy on trapped polyatomic molecules [62.997667081978825]
  Rapid progress in cooling and trapping of molecules has enabled first experiments on high resolution spectroscopy of trapped diatomic molecules. Extending this work to polyatomic molecules provides unique opportunities due to more complex geometries and additional internal degrees of freedom.
  arXiv  Detail & Related papers  (2021-10-21T15:46:17Z)
• Dispersive readout of molecular spin qudits [68.8204255655161]
  We study the physics of a magnetic molecule described by a "giant" spin with multiple $d > 2$ spin states. We derive an expression for the output modes in the dispersive regime of operation. We find that the measurement of the cavity transmission allows to uniquely determine the spin state of the qudits.
  arXiv  Detail & Related papers  (2021-09-29T18:00:09Z)
• Quantum state tomography of molecules by ultrafast diffraction [5.0544023055806235]
  We introduce a framework for the preparation and ultrafast coherent diffraction from rotational wave packets of molecules. We establish a new variant of quantum state tomography for ultrafast electron diffraction to characterize the molecular quantum states. The ability to reconstruct the density matrix of molecules of arbitrary degrees of freedom will provide us with an unprecedentedly clear view of the quantum states of molecules.
  arXiv  Detail & Related papers  (2021-07-28T12:07:56Z)
• Quantum control of nuclear spin qubits in a rapidly rotating diamond [62.997667081978825]
  Nuclear spins in certain solids couple weakly to their environment, making them attractive candidates for quantum information processing and inertial sensing. We demonstrate optical nuclear spin polarization and rapid quantum control of nuclear spins in a diamond physically rotating at $1,$kHz, faster than the nuclear spin coherence time. Our work liberates a previously inaccessible degree of freedom of the NV nuclear spin, unlocking new approaches to quantum control and rotation sensing.
  arXiv  Detail & Related papers  (2021-07-27T03:39:36Z)
• Relativistic aspects of orbital and magnetic anisotropies in the chemical bonding and structure of lanthanide molecules [60.17174832243075]
  We study the electronic and ro-vibrational states of heavy homonuclear lanthanide Er2 and Tm2 molecules by applying state-of-the-art relativistic methods. We were able to obtain reliable spin-orbit and correlation-induced splittings between the 91 Er2 and 36 Tm2 electronic potentials dissociating to two ground-state atoms.
  arXiv  Detail & Related papers  (2021-07-06T15:34:00Z)
• Robust storage qubits in ultracold polar molecules [0.0]
  We characterise the dominant mechanisms for decoherence of a storage qubit in an optically trapped ultracold gas of RbCs molecules. Our results unlock the potential of ultracold molecules as a platform for quantum computation.
  arXiv  Detail & Related papers  (2021-03-10T19:20:27Z)
• Quantum coherent spin-electric control in a molecular nanomagnet at clock transitions [57.50861918173065]
  Electrical control of spins at the nanoscale offers architectural advantages in spintronics. Recent demonstrations of electric-field (E-field) sensitivities in molecular spin materials are tantalising. E-field sensitivities reported so far are rather weak, prompting the question of how to design molecules with stronger spin-electric couplings.
  arXiv  Detail & Related papers  (2020-05-03T09:27:31Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.