Ultraviolet Laser Pulses with Multigigahertz Repetition Rate and Multiwatt Average Power for Fast Trapped-Ion Entanglement Operations

Hussain, Muhammad Iqbal; Heinrich, D.; Guevara-Bertsch, Milena; Torrontegui, E.; García-Ripoll, Juan José; Roos, C. F.; Blatt, R.

doi:10.1103/physrevapplied.15.024054

Cited by 12 publications

(10 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our analysis shows that it is possible to engineer ultra-fast gates T < 2π/ω, using pulse picking strategies for an experimentally relevant setup [27,32]. Current two-qubit Mølmer-Sørensen gate operations require a duration of T ∼ 40 µs for entangling two qubits at a trapping frequency ω 2π × 1.4 MHz [19].…”

Section: Discussionmentioning

confidence: 93%

See 1 more Smart Citation

Ultra-fast two-qubit ion gate using sequences of resonant pulses

Torrontegui,

Heinrich,

Hussain

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

We propose a new protocol to implement ultra-fast two-qubit phase gates with trapped ions using spin-dependent kicks induced by resonant transitions. By only optimizing the allocation of the arrival times in a pulse train sequence the gate is implemented in times faster than the trapping oscillation period T < 2π/ω. Such gates allow us to increase the number of gate operations that can be completed within the coherence time of the ion-qubits favoring the development of scalable quantum computers.

show abstract

Section: Discussionmentioning

confidence: 93%

“…The minimum separation is given by the pulse duration, τ δt to avoid interference. In our system, the excited state 4P 3/2 has a lifetime t γ = 6.9 ns and T e 1 ps [27,32]…”

Section: Estimation Of Errorsmentioning

confidence: 98%

Ultra-fast two-qubit ion gate using sequences of resonant pulses

Torrontegui,

Heinrich,

Hussain

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…The control pulse also needs to be short, τ c 1/Γ e , 1/Γ a to avoid spontaneous emission from the excited |e , |a states, and τ c 1/ω hfs,g , 1/ω hfs,a for suppression of hyperfine couplings typically occurring at a moderately faster time scale. The laser of choice is a picosecond laser [33,35,36]. The ∼ 100 GHz bandwidth is narrow enough to resolve atomic lines with multi-THz separations, wide enough to cover the typical hyperfine interaction at the GHz level, and support quick enough pulsed control to avoid radiation damping.…”

Section: Introductionmentioning

confidence: 99%

Composite picosecond control of atomic state through a nanofiber interface

Ma¹,

Liu²,

Ji³

et al. 2022

Preprint

View full text Add to dashboard Cite

Accurate control of single emitters at nanophotonic interfaces may greatly expand the accessible quantum states of coupled optical spins in the confined geometry and to unveil exotic nonlinear quantum optical effects. However, the optical control is challenged by spatially varying light-atom coupling strength generic to nanophotonics. We demonstrate numerically that despite the nearfield inhomogenuity, nearly perfect atomic state control can be achieved by exploiting geometric robustness of optical transitions with composite picosecond excitations. Our proposal is followed by a proof-of-principle demonstration where an N = 3 composite sequence is applied to robustly invert the D1 population of free-flying 85 Rb atoms trespassing a nanofiber interface. The precise control is confirmed by comparing the D2 fiber transmission with full-level simulation of the mesoscopic light-atom interaction across the composite parameter space. We project the scheme to large N for precise phase patterning and arbitrary optical dipole control at the nanophotonic interface.

show abstract

“…giving unitary errors, entanglement protocols saturating the bound while dealing with these parasitic couplings are highly sought after as they minimize decoherence (non-unitary errors). Devising and realizing such protocols are the subject of intense efforts on all platforms [10,[15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Ultrafast energy exchange between two single Rydberg atoms on the nanosecond timescale

Chew,

Tomita,

Mahesh

et al. 2021

Preprint

View full text Add to dashboard Cite

Rydberg atoms, with their giant electronic orbitals, exhibit dipole-dipole interaction reaching the GHz range at a distance of a micron, making them a prominent contender for realizing quantum operations well within their coherence time. However, such strong interactions have never been harnessed so far, mainly because of the stringent requirements on the fluctuation of the atom positions and the necessary excitation strength. Here, using atoms trapped in the motional groundstate of optical tweezers and excited to a Rydberg state with picosecond pulsed lasers, we observe an interaction-driven energy exchange, i.e., a Förster oscilation, occuring in a timescale of nanoseconds, two orders of magnitude faster than in any previous work with Rydberg atoms. This ultrafast coherent dynamics gives rise to a conditional phase which is the key resource for an ultrafast controlled-Z gate. This opens the path for quantum simulation and computation operating at the speed-limit set by dipole-dipole interactions with this ultrafast Rydberg platform.

show abstract

Ultraviolet Laser Pulses with Multigigahertz Repetition Rate and Multiwatt Average Power for Fast Trapped-Ion Entanglement Operations

Cited by 12 publications

References 28 publications

Ultra-fast two-qubit ion gate using sequences of resonant pulses

Ultra-fast two-qubit ion gate using sequences of resonant pulses

Composite picosecond control of atomic state through a nanofiber interface

Ultrafast energy exchange between two single Rydberg atoms on the nanosecond timescale

Contact Info

Product

Resources

About