Hybrid setup for stable magnetic fields enabling robust quantum control

Hakelberg, Frederick; Kiefer, Philip M.; Wittemer, Matthias; Schaetz, Tobias; Warring, U.

doi:10.1038/s41598-018-22671-5

Cited by 5 publications

(3 citation statements)

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“…These field drifts also make it very hard to measure the phase noise of the maser source. It is thus evident that to enable real applications of the maser as an MW source and to properly measure the phase noise of such an oscillator, one must use much more stable magnets, preferably based on permanent magnets that have excellent short-term (in the range of seconds) field stability ( 19 ). This mainly technical issue can be resolved, potentially resulting in a unique narrowband MW source with high short-term (<1 s) stability and very low phase noise, similar to other state-of-the-art cryogenic MW sources ( 20 ).…”

Section: Discussionmentioning

confidence: 99%

Diamond-based microwave quantum amplifier

et al. 2022

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Amplification of weak microwave signals with minimal added noise is of importance to science and technology. Artificial quantum systems, based on superconducting circuits, can now amplify and detect even single microwave photons. However, this requires operating at millikelvin temperatures. Natural quantum systems can also be used for low-noise microwave amplification using stimulated emission effects; however, they generate a higher noise, especially when operating above ~1 K. Here, we demonstrate the use of electron spins in diamond as a quantum microwave amplifier operating with quantum-limited internal noise, even above liquid nitrogen temperatures. We report on the amplifier’s design, gain, bandwidth, saturation power, and noise. This capability can lead the way to previously unavailable quantum science, engineering, and physics applications.

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Section: Discussionmentioning

confidence: 99%

Diamond-based microwave quantum amplifier

et al. 2022

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“…The static magnetic field B 0 defining the quantization axis at an angle of 45°with respect to the trap axis is produced by a hybrid setup consisting of two permanent magnet assemblies and a pair of compensation coils. 30 At the ion position, this setup generates a magnetic field of |B 0 | = 22.3 mT forming a first-order magnetic field-insensitive qubit 31 on the hyperfine levels 2 S 1/2 |F = 1, m F = 1〉 ≡ |↑〉 and 2 S 1/2 |F = 2, m F = 1〉 ≡ |↓〉 with an unperturbed transition frequency of ω 0 ≃ 2π × 1082.55 MHz, cf. Fig.…”

Section: Resultsmentioning

confidence: 99%

Integrated 9Be+ multi-qubit gate device for the ion-trap quantum computer

et al. 2019

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We demonstrate the experimental realization of a two-qubit Mølmer-Sørensen gate on a magnetic field-insensitive hyperfine transition in 9 Be + ions using microwave near-fields emitted by a single microwave conductor embedded in a surface-electrode ion trap. The design of the conductor was optimized to produce a high oscillating magnetic field gradient at the ion position. The measured gate fidelity is determined to be 98.2 ± 1.2% and is limited by technical imperfections, as is confirmed by a comprehensive numerical error analysis. The conductor design can potentially simplify the implementation of multi-qubit gates and represents a self-contained, scalable module for entangling gates within the quantum CCD architecture for an ion-trap quantum computer.

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“…Two-level qubit states can be chosen to share the same magnetic field sensitivity, but that solution does not generalize to more than two states. Technological solutions have been found to stabilize magnetic fields to the order of 1 pT by utilizing magnetic shielding and applying quantization fields with permanent magnet arrays, resulting in coherence times of order one second for magnetic-fieldsensitive qubits [56,57].…”

Section: Encoding and Coherencementioning

confidence: 99%

Practical trapped-ion protocols for universal qudit-based quantum computing

Low

White

Cox

et al. 2020

Phys. Rev. Research

109

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The notion of universal quantum computation can be generalized to multilevel qudits, which offer advantages in resource usage and algorithmic efficiencies. Trapped ions, which are pristine and well-controlled quantum systems, offer an ideal platform to develop qudit-based quantum information processing. Previous work has not fully explored the practicality of implementing trapped-ion qudits accounting for known experimental error sources. Here, we describe a universal set of protocols for state preparation, single-qudit gates, a generalization of the Mølmer-Sørensen gate for two-qudit gates, and a measurement scheme which utilizes shelving to a metastable state. We numerically simulate known sources of error from previous trapped-ion experiments, and show that there are no fundamental limitations to achieving fidelities above 99% for three-level qudits encoded in 137 Ba + ions. Our methods are extensible to higher-dimensional qudits, and our measurement and single-qudit gate protocols can achieve 99% fidelities for five-level qudits. We identify avenues to further decrease errors in future work. Our results suggest that three-level trapped-ion qudits will be a useful technology for quantum information processing.

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Hybrid setup for stable magnetic fields enabling robust quantum control

Cited by 5 publications

References 50 publications

Diamond-based microwave quantum amplifier

Diamond-based microwave quantum amplifier

Integrated 9Be+ multi-qubit gate device for the ion-trap quantum computer

Practical trapped-ion protocols for universal qudit-based quantum computing

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