Tunable transverse spin–motion coupling for quantum information processing

West, Adam; Putnam, Randall; Campbell, W. C.; Hamilton, Paul

doi:10.1088/2058-9565/abcb5d

Cited by 10 publications

(4 citation statements)

References 33 publications

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“…Since the strongly-correlated regime we studied here is the working regime of ion-trap qubits [24,96], the proposed setup could also be used for quality control of ion-trap qubits. It would be exciting to investigate how to control the transfer of angular momentum between the twisted light and the trap, a key technology in improving gate fidelity in ion-trap quantum computers [97]. To study momentum transfer one would need to use two-or three-dimensionsal traps.…”

Section: Discussionmentioning

confidence: 99%

Characteristic features of strong correlation: lessons from a 3-fermion one-dimensional harmonic trap

Caliva,

Fuks

2024

J. Phys. Mater.

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Many quantum phenomena responsible for key applications in material science and quantumchemistry arise in the strongly correlated regime. This is at the same time, a costly regime forcomputer simulations. In the limit of strong correlation analytic solutions exist, but as we moveaway from this limit numerical simulation are needed, and accurate quantum solutions do not scalewell with the number of interacting particles. In this work we propose to use few-particle harmonictraps in combination with twisted light as a quantum emulator to investigate the transition into astrongly-correlated regime. Using both analytic derivations and numerical simulations we generalizeprevious findings on 2 Coulomb interacting fermions trapped in a one-dimensional harmonic trapto the case of 3 fermions. The 4 signatures of strong correlation we have identified in the one-dimensional harmonic trap are: i) the ground state density is highly localized around N equilibriumpositions, where N is the number of particles, ii) the symmetric and antisymmetric ground statewavefunctions become degenerate, iii) the von Neumann entropy grows, iv) the energy spectrum isfully characterized by N normal modes or less. Our findings describe the low-energy behavior ofelectrons in quantum wires and ions in Paul traps. Similar features have also been reported for coldatoms in optical lattices.

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Section: Discussionmentioning

confidence: 99%

Characteristic features of strong correlation: lessons from a 3-fermion one-dimensional harmonic trap

Caliva,

Fuks

2024

J. Phys. Mater.

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“…Note that the framework introduced above can be used to predict the transversal motional excitations of a single trapped ion when is placed in the phase singularity of a vortex beam or within a slightly misaligned Gaussian beam, as respectively reported in 27 and 62 . In both works, the electric field gradients perpendicular to the light propagation direction lead to transversal motion excitations, where the transition strengths are described by an effective transverse Lamb–Dicke parameter and modulated by the beam mode profiles and polarization structures.…”

Section: Coherent Coupling Of Structured Light Fields To the Motion O...mentioning

confidence: 99%

Trapped atoms in spatially-structured vector light fields

Verde,

Schmiegelow,

Poschinger

et al. 2023

Sci Rep

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Spatially-structured laser beams, eventually carrying orbital angular momentum, affect electronic transitions of atoms and their motional states in a complex way. We present a general framework, based on the spherical tensor decomposition of the interaction Hamiltonian, for computing atomic transition matrix elements for light fields of arbitrary spatial mode and polarization structures. We study both the bare electronic matrix elements, corresponding to transitions with no coupling to the atomic center-of-mass motion, as well as the matrix elements describing the coupling to the quantized atomic motion in the resolved side-band regime. We calculate the spatial dependence of electronic and motional matrix elements for tightly focused Hermite–Gaussian, Laguerre–Gaussian and for radially and azimuthally polarized beams. We show that near the diffraction limit, all these beams exhibit longitudinal fields and field gradients, which strongly affect the selection rules and could be used to tailor the light-matter interaction. The presented framework is useful for describing trapped atoms or ions in spatially-structured light fields and therefore for designing new protocols and setups in quantum optics, -sensing and -information processing. We provide open code to reproduce our results or to evaluate interaction matrix elements for different transition types, beam structures and interaction geometries.

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“…Note that the framework introduced above can be used to predict the transversal motional excitations of a single trapped ion when is placed in the phase singularity of a vortex beam or within a slightly misaligned Gaussian beam, as respectively reported in Stopp et al [2022] and West et al [2021]. In both works, the electric field gradients perpendicular to the light propagation direction lead to transversal motion excitations, where the transition strengths are described by an effective transverse Lamb-Dicke parameter η ⊥ and modulated by the beam mode profiles and polarization structures.…”

Section: Coherent Coupling Of Structured Light Fields To the Motion O...mentioning

confidence: 99%

Die Anfänge des Frauenstudiums an der Johannes Gutenberg-Universität Mainz

George¹

2023

Frauen an Der Johannes Gutenberg-Universität Mainz (1946–2022)

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Spatially-structured laser beams, eventually carrying orbital angular momentum, affect electronic transitions of atoms and their motional states in a complex way. We present a general framework, based on the spherical tensor decomposition of the interaction Hamiltonian, for computing atomic transition matrix elements for light fields of arbitrary spatial mode and polarization structures. We study both the bare electronic matrix elements, corresponding to transitions with no coupling to the atomic center-of-mass motion, as well as the matrix elements describing the coupling to the quantized atomic motion in the resolved side-band regime. We calculate the spatial dependence of electronic and motional matrix elements for tightly focused Hermite-Gaussian, Laguerre-Gaussian and for radially and azimuthally polarized beams. We show that near the diffraction limit, all these beams exhibit longitudinal fields and field gradients, which strongly affect the selection rules and could be used to tailor the light-matter interaction. The presented framework is useful for describing trapped atoms or ions in spatially-structured light fields and therefore for designing new protocols and setups in quantum optics, -sensing and -information processing.

show abstract

Tunable transverse spin–motion coupling for quantum information processing

Cited by 10 publications

References 33 publications

Characteristic features of strong correlation: lessons from a 3-fermion one-dimensional harmonic trap

Characteristic features of strong correlation: lessons from a 3-fermion one-dimensional harmonic trap

Trapped atoms in spatially-structured vector light fields

Die Anfänge des Frauenstudiums an der Johannes Gutenberg-Universität Mainz

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