Sideband cooling of molecules in optical traps

Caldwell, Luke; Tarbutt, M. R.

doi:10.1103/physrevresearch.2.013251

Cited by 42 publications

(23 citation statements)

References 34 publications

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“…10(d) and recently demonstrated [85]. The molecules can be tightly confined and cooled to the motional ground state of the trap [118], and the array of molecules can be reconfigured as needed [119] in order to implement quantum gates between selected pairs. Another interesting approach is to trap the molecules near a surface using microscopic electric or magnetic traps, as illustrated in Fig.…”

Section: Quantum Information Processingmentioning

confidence: 99%

From Hot Beams to Trapped Ultracold Molecules: Motivations, Methods and Future Directions

Fitch

Tarbutt

2021

Molecular Beams in Physics and Chemistry

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Over the past century, the molecular beam methods pioneered by Otto Stern have advanced our knowledge and understanding of the world enormously. Stern and his colleagues used these new techniques to measure the magnetic dipole moments of fundamental particles with results that challenged the prevailing ideas in fundamental physics at that time. Similarly, recent measurements of fundamental electric dipole moments challenge our present day theories of what lies beyond the Standard Model of particle physics. Measurements of the electron’s electric dipole moment (eEDM) rely on the techniques invented by Stern and later developed by Rabi and Ramsey. We give a brief review of this historical development and the current status of eEDM measurements. These experiments, and many others, are likely to benefit from ultracold molecules produced by laser cooling. We explain how laser cooling can be applied to molecules, review recent progress in this field, and outline some eagerly anticipated applications.

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Section: Quantum Information Processingmentioning

confidence: 99%

From Hot Beams to Trapped Ultracold Molecules: Motivations, Methods and Future Directions

Fitch

Tarbutt

2021

Molecular Beams in Physics and Chemistry

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“…We recognize in the detuning dependence that the force is essentially a dipole force [39], arising from polarization gradients near the focus of a linearly polarized light beam [11,12,14,29,35,40,41]. This transverse force will push the atom away from the optical axis.…”

Section: Off-axis Trapping In Tweezersmentioning

confidence: 99%

Spiraling light: from donut modes to a Magnus effect analogy

Spreeuw

2021

Preprint

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The insight that optical vortex beams carry orbital angular momentum (OAM), which emerged in Leiden about 30 years ago, has since led to an ever expanding range of applications and follow-up studies. This paper starts with a short personal account of how these concepts arose. This is followed by a description of some recent ideas where the coupling of transverse orbital and spin angular momentum (SAM) in tightly focused laser beams produces interesting new effects. The deflection of a focused light beam by an atom in the focus is reminiscent of the Magnus effect known from aerodynamics. Momentum conservation dictates an accompanying light force on the atom, transverse to the optical axis. As a consequence, an atom held in an optical tweezer will be trapped at a small distance of up to 𝜆/2𝜋 away from the optical axis, which depends on the spin state of the atom and the magnetic field direction. This opens up new avenues to control the state of motion of atoms in optical tweezers as well as potential applications in quantum gates and interferometry.

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“…Our implementation of magnetic field cancelation, in combination with the magic angle, leaves residual light shifts from the differential polarizability as the limitation to the Ramsey coherence time on the 100 ms time scale. The future implementation of Raman sideband cooling of the molecules in the tweezers could provide yet another significant improvement to the rotational coherence time [43]. The type of qubit states used in our work are generic to 2 Σ molecules with nuclear spin I = 1/2 and MHz scale hyperfine splittings, thus our choice of qubit states is general.…”

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confidence: 99%

Rotational Coherence Times of Polar Molecules in Optical Tweezers

et al. 2021

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Qubit coherence times are critical to the performance of any robust quantum computing platform. For quantum information processing using arrays of polar molecules, a key performance parameter is the molecular rotational coherence time. We report a 93(7) ms coherence time for rotational state qubits of laser cooled CaF molecules in optical tweezer traps, over an order of magnitude longer than previous systems. Inhomogeneous broadening due to the differential polarizability between the qubit states is suppressed by tuning the tweezer polarization and applied magnetic field to a "magic" angle. The coherence time is limited by the residual differential polarizability, implying improvement with further cooling. A single spin-echo pulse is able to extend the coherence time to nearly half a second. The measured coherence times demonstrate the potential of polar molecules as high fidelity qubits.

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Sideband cooling of molecules in optical traps

Cited by 42 publications

References 34 publications

From Hot Beams to Trapped Ultracold Molecules: Motivations, Methods and Future Directions

From Hot Beams to Trapped Ultracold Molecules: Motivations, Methods and Future Directions

Spiraling light: from donut modes to a Magnus effect analogy

Rotational Coherence Times of Polar Molecules in Optical Tweezers

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