Quantum Rabi dynamics of trapped atoms far in the deep strong coupling regime

Koch, Johannes; Hunanyan, Geram R.; Ockenfels, Till; Rico, E.; Solano, E.; Weitz, Martin

doi:10.1038/s41467-023-36611-z

Cited by 8 publications

(3 citation statements)

References 29 publications

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“…Here, the coupling rate is proportional to the long-axis spinning frequency, which can be made arbitrarily large without running into mechanical instabilities. We reach coupling strengths g that are a factor of 724 larger than the uncoupled libration frequencies Ω 0 , outperforming the g/Ω 0 values demonstrated with trapped atoms by a large margin [22].…”

Section: Introductionmentioning

confidence: 77%

Spinning a levitated mechanical oscillator far into the deep-strong coupling regime

Novotny,

Zielinska,

Laan

et al. 2023

Preprint

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The field of levitodynamics has made substantial advancements in manipulating the translational and rotational degrees of freedom of levitated nanoparticles. Notably, rotational degrees of freedom can now be cooled to millikelvin temperatures and driven into GHz rotational speeds. However, in the case of cylindrically symmetric nanorotors, only the rotations around their short axes have been effectively manipulated, while the possibility to control rotation around the longer axis has remained a notable gap in the field. Here, we extend the rotational control toolbox by engineering an optically levitated nanodumbbell in vacuum into controlled spinning around its long axis with spinning rates exceeding 1 GHz. This fast spinning introduces deep-strong coupling between the nanodumbell’s libration modes, such that the coupling rate g exceeds the bare libration frequencies Ω0 by two orders of magnitude with g/Ω0 = 724 ± 33. Our control over the long-axis rotation opens the door to study the physics of deep-strong coupled mechanical oscillators and to observe macroscopic rotational quantum interference effects, thus laying a solid foundation for future applications in quantum technologies. Additionally, we find that our system offers great potential as a nanoscopic gyroscope with competitive sensitivity.

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Section: Introductionmentioning

confidence: 77%

Spinning a levitated mechanical oscillator far into the deep-strong coupling regime

Novotny,

Zielinska,

Laan

et al. 2023

Preprint

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“…It leads to massive interesting non-trivial physical phenomena, e.g. Fano resonances, [7,8] Rabi oscillation, [9,10] electromagnetically induced transparency, [11] bound states in the continuum (BIC), [12,13] as well as parity-time (PT) symmetry, [14,15] etc. in nanophotonics.…”

Section: Introductionmentioning

confidence: 99%

Strong‐Coupling‐Enhanced Raman Spectroscopy (SCERS) in a Cascade Microsphere‐Cavity

Mi,

Xu,

Zhao

et al. 2024

Advanced Optical Materials

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Surface‐enhanced Raman spectroscopy (SERS) is a powerful optical technique with high sensitivity to identify analytes down to a single molecule by fingerprinting vibrational information. The strong coupling in microcavities for supermodes with promoted quality factors demonstrates the capability to boost the interaction between photons and molecules for nonlinear effects. Here a strong‐coupling cascade microsphere‐cavity (MC) achieving spontaneous Raman enhancement is reported, for the first time. The cascade MC is composed of two size‐mismatched microspheres, both of which support optical whispering‐gallery modes (WGMs) with significantly different free‐space ranges. The strong coupling between the supported WGMs in the microspheres can be achieved when the quasi‐vernier effect of resonant modes occurs, by which the energy splitting is up to 4 meV. The fast energy transfer between the size‐mismatched MCs therefore increases the quality factor up to 2.1 × 103 for the upper supermode branch. The strong‐coupling cascade MC structure provides an extra enhancement channel for the Au‐based SERS substrate, demonstrating an enhancement factor of Raman intensity (EFRI) up to 2.6 × 1010 for the limit of detection (LoD) down to 10−12 M of 4‐aminothiophenol (4‐ATP). The strong‐coupling cascade MC substrates also exhibit the versatility for identification of multiple analytes for high‐performance Raman trace‐detection applications.

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“…These gates involve deep-strong couplings between a CV oscillator and a DV two-level system 17,18 . They are widely available in various experiments involving trapped ions 9,[19][20][21][22][23][24] and superconducting circuits [25][26][27][28][29] among many others, and can be implemented effectively by coherent Hamiltonian control in photonic and molecular crystal systems [30][31][32][33][34][35][36][37][38] where the bosonic mode is represented by a microwave, a phononic, or even an optical field. Moreover, the incremental approach 39 based on these gates can achieve universality in CV quantum computation.…”

mentioning

confidence: 99%

Efficient bosonic nonlinear phase gates

Park,

Filip

2024

npj Quantum Inf

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Continuous-variable (CV) quantum information processing harnesses versatile experimental tools that leverage the power of infinite-dimensional oscillators controlled by a single qubit. Increasingly available elementary Rabi gates have been proposed as a resource for implementing universal CV gates, but the requirement of many weak, non-commuting gates is a bottleneck in scaling up such an approach. In this study, we propose a resource-efficient technique using Fourier expansion to implement arbitrary non-linear phase gates in a single oscillator. This method reduces the number of sequentially required gates exponentially. These gates represented by cubic, quartic, and other arbitrary nonlinear potentials have applications in CV quantum information processing with infinite-dimensional oscillators controlled by a single qubit. Our method outperforms previous approaches and enables the experimental realization of a wide range of applications, including the development of bosonic quantum sensors, simulations, and computation using trapped ions and superconducting circuits.

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Quantum Rabi dynamics of trapped atoms far in the deep strong coupling regime

Cited by 8 publications

References 29 publications

Spinning a levitated mechanical oscillator far into the deep-strong coupling regime

Spinning a levitated mechanical oscillator far into the deep-strong coupling regime

Strong‐Coupling‐Enhanced Raman Spectroscopy (SCERS) in a Cascade Microsphere‐Cavity

Efficient bosonic nonlinear phase gates

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