Toward a scalable quantum computing architecture with mixed species ion chains

Wright, John; Auchter, Carolyn; Chou, Chen-Kuan; Graham, Richard D.; Noël, Thomas; Sakrejda, Tomasz; Zhou, Zichao; Blinov, B. B.

doi:10.1007/s11128-015-1220-9

Cited by 8 publications

(6 citation statements)

References 22 publications

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“…Typically a single ionic species is trapped and a single transition is selected as pseudo-spin degree of freedom, so that naturally ζ = s (for reviews on ion trapping see for instance [13,6,14]). More general set-ups, including mixed ion species and/or addressing of several transitions, are however also possible or conceivable [15,16], and in this case ancillas with spin ζ = s may be implemented.…”

Section: )mentioning

confidence: 99%

Reducing backaction when measuring temporal correlations in quantum systems

Kastner

Uhrich

2018

Eur. Phys. J. Spec. Top.

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Dynamic correlations of quantum observables are challenging to measure due to measurement backaction incurred at early times. Recent work [P. Uhrich et al., Phys. Rev. A, 96:022127 (2017)] has shown that ancilla-based noninvasive measurements are able to reduce this backaction, allowing for dynamic correlations of single-site spin observables to be measured. We generalise this result to correlations of arbitrary spin observables and extend the measurement protocol to simultaneous noninvasive measurements which allow for real and imaginary parts of correlations to be extracted from a single set of measurements. We use positive operator-valued measures to analyse the dynamics generated by the ancilla-based measurements. Using this framework we prove that special observables exist for which measurement backaction is of no concern, so that dynamic correlations of these can be obtained without making use of ancillas.Correspondence to: kastner@sun.ac.za

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Section: )mentioning

confidence: 99%

Reducing backaction when measuring temporal correlations in quantum systems

Kastner

Uhrich

2018

Eur. Phys. J. Spec. Top.

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“…al. [116]), further improvements in time keeping [8], integrated optics [142] (see this Issue's article by D. Kielpinski,et. al.…”

Section: Discussionmentioning

confidence: 99%

“…The optical cavity designs presented here allow cavity lengths, L, in the 100s of µm range and cavity mode waists, ω 0 , of several µm in order to increase the coherent coupling strength, g, between the ion and the cavity which scales as g ∝ ω −1 0 L − 1 2 [108]. An additional benefit of trapping a chain of ions is the Coulomb interaction can be used as a communication bus within the chain to allow a large range of quantum information and quantum simulation applications to be studied [27,116].…”

Section: Symmetric Traps With Integrated Optical Cavitiesmentioning

confidence: 99%

Ion trap architectures and new directions

Siverns

Quraishi

2017

Quantum Inf Process

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Trapped ion technology has seen advances in performance, robustness, and versatility over the last decade. With increasing numbers of trapped ion groups world-wide, a myriad of trap architectures are currently in use. Applications of trapped ions include: quantum simulation, computing and networking, time standards and fundamental studies in quantum dynamics. Design of such traps is driven by these various research aims, but some universally desirable properties have lead to the development of ion trap foundries. The excellent control achievable with trapped ions and the ability to do photonic-readout, has allowed progress on quantum networking using entanglement between remotely situated ion-based nodes. Here we present a selection of trap architectures currently in use by the community and present their most salient characteristics, identifying features particularly suited for quantum networking. We also discuss our own in-house research efforts aimed at long-distance trapped ion-networking.Comment: 30 pages, 28 figures, 6 table

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“…Conversion of coherent light at 369 nm has been done to telecom wavelengths with a single-stage DFG process, but with ω p greater than ω 2 [55], resulting in SPDC noise at the target telecom photon, and also in a two-stage process [56] with higher poling period and, therefore, reduced conversion efficiencies [57]. To observe a long-lived memory entangled with either a visible or telecom photon, it should be possible to generate local entanglement between Yb + and Ba + [58] and then do QFC on the photon emitted by the Ba + ion.…”

Section: A Quantum Frequency Conversion (Qfc) Backgroundmentioning

confidence: 99%

Ion–photon entanglement and quantum frequency conversion with trapped Ba^+ ions

Siverns¹,

Li²,

Quraishi³

2017

Appl. Opt.

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Trapped ions are excellent candidates for quantum nodes, as they possess many desirable features of a network node including long-lifetimes, on-site processing capability and produce photonic flying qubits. However, unlike classical networks in which data may be transmitted in optical fibers and the range of communication readily extended with amplifiers, quantum systems often emit photons that have limited propagation range in optical fibers and, by virtue of the nature of a quantum state, cannot be noiselessly amplified. Here, we first describe a method to extract flying qubits from a Ba + trapped ion via shelving to a long lived, low-lying D-state with higher entanglement probabilities compared with current strong and weak excitation methods. We show a projected fidelity of ≈89% of the ion-photon entanglement. We compare several methods of ion-photon entanglement generation and show how the fidelity and entanglement probability varies as a function of the photon collection optic's numerical aperture. We then outline an approach for quantum frequency conversion of the photons emitted by the Ba + ion to the telecom range for long-distance networking and to 780 nm, for potential entanglement with Rubidium based quantum memories. Our approach is significant for extending the range of quantum networks and for development of hybrid quantum networks compromised of different types of quantum memories.

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Toward a scalable quantum computing architecture with mixed species ion chains

Cited by 8 publications

References 22 publications

Reducing backaction when measuring temporal correlations in quantum systems

Reducing backaction when measuring temporal correlations in quantum systems

Ion trap architectures and new directions

Ion–photon entanglement and quantum frequency conversion with trapped Ba^+ ions

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