Multispecies Trapped-Ion Node for Quantum Networking

Inlek, I. V.; Crocker, Clayton; Lichtman, Martin; Sosnova, Ksenia; Monroe, Christopher

doi:10.1103/physrevlett.118.250502

Cited by 89 publications

(77 citation statements)

References 33 publications

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“…There is the potential in addition to use a single laser wavelength near 400 nm for interspecies Raman-based logic [358], though scattering to the D levels may ultimately limit Raman-gate fidelity. The heavy-ion pairing Ba + /Yb + is being pursued for remoteentanglement in a modular QC architecture [311], with the very favorable Ba + wavelengths serving to provide photons for entanglement generation. Interspecies operations here require more power than with the other ions (see Fig.…”

Section: Discussionmentioning

confidence: 99%

“…The first demonstrations of dual-species sympathetic cooling were done in Penning traps, where 24 Mg + was used to cool other Mg + isotopes [304] and where 9 Be + was used to cool 198 Hg + [305] and multiple isotopes of Cd + [306]; it was later demonstrated in a Paul trap with two different isotopes of Cd + [307]. Sympathetic cooling to near the motional ground state, as is likely required for high-fidelity quantum operations has since been done in 24 [311] two-ion chains, as well as in a 9 Be + -40 Ca + -9 Be + three-ion chain [219] and a 9 Be + -24 Mg + -24 Mg + -9 Be + 4-ion chain [312].…”

Section: Dual-species Ion Systemsmentioning

confidence: 99%

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Trapped-ion quantum computing: Progress and challenges

Bruzewicz

Chiaverini

McConnell

et al. 2019

Applied Physics Reviews

1,043

644

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Trapped ions are among the most promising systems for practical quantum computing (QC). The basic requirements for universal QC have all been demonstrated with ions and quantum algorithms using few-ion-qubit systems have been implemented. We review the state of the field, covering the basics of how trapped ions are used for QC and their strengths and limitations as qubits. In addition, we discuss what is being done, and what may be required, to increase the scale of trapped ion quantum computers while mitigating decoherence and control errors. Finally, we explore the outlook for trapped-ion QC. In particular, we discuss near-term applications, considerations impacting the design of future systems of trapped ions, and experiments and demonstrations that may further inform these considerations. CONTENTS

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Section: Discussionmentioning

confidence: 99%

Section: Dual-species Ion Systemsmentioning

confidence: 99%

Trapped-ion quantum computing: Progress and challenges

Bruzewicz

Chiaverini

McConnell

et al. 2019

Applied Physics Reviews

1,043

644

View full text Add to dashboard Cite

show abstract

“…For future quantum networks, the pure entangled photons demonstrated in this letter can be combined with techniques for performing local operations described in previous works [16] to construct a modular node consisting of a superior Yb memory qubit and visible photon flying qubits. This Yb memory is unaffected by the photon generation process, allowing for local operations or storage while the Ba-photon link is created.…”

Section: Ratementioning

confidence: 99%

“…Our previous work has shown ion-photon entanglement with 138 Ba + by first pumping into |↓ and exciting the atom to |e with continuous-wave (CW) light at 493 nm [16]. Because this scheme uses the same line for excitation and collection light, it is susceptible to both types of double-excitation errors.…”

mentioning

confidence: 99%

High purity single photons entangled with an atomic qubit

Crocker¹,

Lichtman²,

Sosnova³

et al. 2019

Opt. Express

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Trapped atomic ions are an ideal candidate for quantum network nodes, with long-lived identical qubit memories that can be locally entangled through their Coulomb interaction and remotely entangled through photonic channels. The integrity of this photonic interface is generally reliant on purity of single photons produced by the quantum memory. Here we demonstrate a singlephoton source for quantum networking based on a trapped 138 Ba + ion with a single photon purity of g 2 (0) = (8.1 ± 2.3) × 10 −5 without background subtraction. We further optimize the tradeoff between the photonic generation rate and the memory-photon entanglement fidelity for the case of polarization photonic qubits by tailoring the spatial mode of the collected light.

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“…Prior work in dual-species trapped-ion quantum logic includes demonstrations of so-called quantum-logic spectroscopy [20] to enable the operation of optical clocks using ions with inaccessible or inconvenient transitions; these typically focus on the Al + clock ion with another species similar in mass used to manipulate and read out its state [21]. Entangling quantum gates have also been performed with the ion systems Be + /Mg + [11], Be + /Ca + [22], 40 Ca + / 43 Ca + [23], and Ba + /Yb + [24]. While these pairs will likely find particular application, they all have drawbacks, such as technologically challenging wavelengths, insufficient separation in internal-state energy splittings, or large masses, and so it is beneficial to explore alternative dual-species systems that may have complementary strengths.…”

Section: Introductionmentioning

confidence: 99%

Dual-species, multi-qubit logic primitives for Ca+/Sr+ trapped-ion crystals

et al. 2019

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We demonstrate key multi-qubit quantum logic primitives in a dual-species trapped-ion system based on 40 Ca + and 88 Sr + ions, using two optical qubits with quantum-logic-control frequencies in the red to near-infrared range. With all ionization, cooling, and control wavelengths in a wavelength band similar for the two species and centered in the visible, and with a favorable mass ratio for sympathetic cooling, this pair is a promising candidate for scalable quantum information processing. Same-species and dual-species two-qubit gates, based on the Mølmer-Sørensen interaction and performed in a cryogenic surface-electrode trap, are characterized via the fidelity of generated entangled states; we achieve fidelities of 98.8(2)% and 97.5(2)% in Ca + -Ca + and Sr + -Sr + gates, respectively. For a similar Ca + -Sr + gate, we achieve a fidelity of 94.3(3)%, and carrying out a Sr + -Sr + gate performed with a Ca + sympathetic cooling ion in a Sr + -Ca + -Sr + crystal configuration, we achieve a fidelity of 95.7(3)%. These primitives form a set of trapped-ion capabilities for logic with sympathetic cooling and ancilla readout or state transfer for general quantum computing and communication applications.

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Multispecies Trapped-Ion Node for Quantum Networking

Cited by 89 publications

References 33 publications

Trapped-ion quantum computing: Progress and challenges

Trapped-ion quantum computing: Progress and challenges

High purity single photons entangled with an atomic qubit

Dual-species, multi-qubit logic primitives for Ca+/Sr+ trapped-ion crystals

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