Micromotion-enhanced fast entangling gates for trapped-ion quantum computing

Ratcliffe, Alexander K.; Oberg, Lachlan M.; Hope, Joseph

doi:10.1103/physreva.101.052332

Cited by 10 publications

(10 citation statements)

References 50 publications

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“…This scenery has been modified in refs. [80][81][82], with the micromotion harnessed to enhance the fidelities of fast gates. Because the dipole forces acting on interacting spins depend on their spatial orientations, the ion micromotion allows a control of those forces.…”

Section: Discussionmentioning

confidence: 99%

Harmonic dual dressing of spin one-half systems

Bevilacqua,

Biancalana,

Zanon-Willette

et al. 2021

Preprint

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Controlled modifications of the quantum magnetic response are produced in dressed systems by a high frequency, strong and not-resonant electromagnetic field. This quantum control is greatly enhanced and enriched by the harmonic, commensurable and orthogonally oriented dual dressing theoretically discussed here. The secondary field enables a fine tuning of the qubit response, with control parameters amplitude, harmonic content, spatial orientation and phase relation. Our analysis is based on a perturbative approach and includes few numerical solutions. The long-time dynamics is described in terms of an anisotropic effective static magnetic field representing the handle for the system full engineering. Through a low-order harmonic mixing the bichromatic driving generates a rectified static field acting on the spin. The Zeeman response becomes anisotropic in a triaxial geometry and includes a quadratic contribution. Our dressing increases the two-level energy splitting, improving the spin detection sensitivity. On the low field direction it compensates the static fields applied in different geometries. A resonant spin exchange between two species having very different magnetic response as electron and nucleus is allowed by the dressing. The spin temporal evolution includes a micromotion at harmonics of the driving frequency whose role in the spin detection is examined and can be exploited in quantum information. The results presented here lay a foundation for additional applications to be harnessed in quantum simulations.

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Section: Discussionmentioning

confidence: 99%

Harmonic dual dressing of spin one-half systems

Bevilacqua,

Biancalana,

Zanon-Willette

et al. 2021

Preprint

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show abstract

“…Hot motional states. In the same manuscript, the authors demonstrated that these fast gate schemes are robust to high temperatures, even for mean motional occupations on the order of n = 10 − 100 [22].…”

Section: Other Error Sourcesmentioning

confidence: 92%

“…We use a truncated expression (generalised from Refs. [17,22,30]) for the infidelity of a fast entangling gate between two ions, µ and ν,…”

Section: Appendix B: Optimisation Methodsmentioning

confidence: 99%

“…Notably this scheme requires no manipulation of trapping potentials for shuttling ions; entangling gates can be performed between ions in neighbouring traps in situ and outperform stateof-the-art shuttling schemes in terms of speed. Further work has demonstrated that these gates can be enhanced by the presence of micromotion, which is otherwise detrimental to gates implemented on radial trap modes [22].…”

Section: Introductionmentioning

confidence: 99%

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Scalable quantum computation with fast gates in two-dimensional microtrap arrays of trapped ions

Mehdi,

Ratcliffe,

Hope

2020

Preprint

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We theoretically investigate the use of fast pulsed two-qubit gates for trapped ion quantum computing in a two-dimensional microtrap architecture. In one dimension, such fast gates are optimal when employed between nearest neighbours, and we examine the generalisation to a two-dimensional geometry. We demonstrate that fast pulsed gates are capable of implementing high-fidelity entangling operations between ions in neighbouring traps faster than the trapping period, with experimentally demonstrated laser repetition rates. Notably, we find that without increasing the gate duration, high-fidelity gates are achievable even in large arrays with hundreds of ions. To demonstrate the usefulness of this proposal, we investigate the application of these gates to the digital simulation of a 40-mode Fermi-Hubbard model. This also demonstrates why shorter chains of gates required to connect arbitrary pairs of ions makes this geometry well suited for large-scale computation.

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“…Notably this scheme requires no manipulation of trapping potentials for shuttling ions; entangling gates can be performed between ions in neighboring traps in situ and outperform state-ofthe-art shuttling schemes in terms of speed. Further work has demonstrated that these gates can be enhanced by the presence of micromotion, which is otherwise detrimental to gates implemented on radial trap modes [22].…”

Section: Introductionmentioning

confidence: 99%

Scalable quantum computation with fast gates in two-dimensional microtrap arrays of trapped ions

2020

Self Cite

View full text Add to dashboard Cite

We theoretically investigate the use of fast pulsed two-qubit gates for trapped ion quantum computing in a two-dimensional microtrap architecture. In one dimension, such fast gates are optimal when employed between nearest neighbors, and we examine the generalization to a two-dimensional geometry. We demonstrate that fast pulsed gates are capable of implementing high-fidelity entangling operations between ions in neighboring traps faster than the trapping period, with experimentally demonstrated laser repetition rates. Notably, we find that without increasing the gate duration high-fidelity gates are achievable even in large arrays with hundreds of ions. To demonstrate the usefulness of this proposal, we investigate the application of these gates to the digital simulation of a 40-mode Fermi-Hubbard model. This also demonstrates why shorter chains of gates required to connect arbitrary pairs of ions make this geometry well suited for large-scale computation.

show abstract

Micromotion-enhanced fast entangling gates for trapped-ion quantum computing

Cited by 10 publications

References 50 publications

Harmonic dual dressing of spin one-half systems

Harmonic dual dressing of spin one-half systems

Scalable quantum computation with fast gates in two-dimensional microtrap arrays of trapped ions

Scalable quantum computation with fast gates in two-dimensional microtrap arrays of trapped ions

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