Realizing coherently convertible dual-type qubits with the same ion species

Yang, H.-X.; Ma, Jichi; Wu, Yukai; Wang, Yaogong; Cao, Mengdi; Guo, Weixuan; Huang, Yichen; Feng, Lei; Zhou, Z.-C.; Duan, L.-M.

doi:10.1038/s41567-022-01661-5

Cited by 21 publications

(9 citation statements)

References 34 publications

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“…As mentioned above, among the 16% infidelity, only about 3% comes from the measured coherence time, while the dominant sources are the conversion infidelity between the S -qubit and the F -qubit, and the SPAM error using EMCCD. Compared with our previous work, here our round-trip qubit-type conversion fidelity is lowered by about 2% 16 . This is because we only perform sympathetic Doppler cooling during the long time storage while in Ref.…”

Section: Discussioncontrasting

confidence: 61%

“…In the dual-type qubit scheme, we can also encode as an F -qubit spanned by and . The two qubit types can be coherently converted into each other by focused 411 nm laser and global 3432 nm laser via the intermediate D 5/2 levels 16 as shown in Fig. 1 e. We use bichromatic laser to transfer both qubit levels simultaneously so that the qubit state is insensitive to the laser dephasing.…”

Section: Resultsmentioning

confidence: 99%

“…However, as the ion number increases, the efficiency of sympathetic cooling will decrease due to the mass mismatch 15 . To solve this problem, recently a dual-type qubit scheme was proposed and demonstrated for crosstalk-avoided sympathetic cooling and single-qubit operations using the same ion species 16 . Such a scheme using a single ion species for various tasks has now been widely regarded as a promising way for scalable ion trap quantum computing 17 .…”

Section: Introductionmentioning

confidence: 99%

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Realization of a crosstalk-avoided quantum network node using dual-type qubits of the same ion species

Feng,

Huang,

et al. 2024

Nat Commun

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Generating ion-photon entanglement is a crucial step for scalable trapped-ion quantum networks. To avoid the crosstalk on memory qubits carrying quantum information, it is common to use a different ion species for ion-photon entanglement generation such that the scattered photons are far off-resonant for the memory qubits. However, such a dual-species scheme can be subject to inefficient sympathetic cooling due to the mass mismatch of the ions. Here we demonstrate a trapped-ion quantum network node in the dual-type qubit scheme where two types of qubits are encoded in the S and F hyperfine structure levels of 171Yb+ ions. We generate ion photon entanglement for the S-qubit in a typical timescale of hundreds of milliseconds, and verify its small crosstalk on a nearby F-qubit with coherence time above seconds. Our work demonstrates an enabling function of the dual-type qubit scheme for scalable quantum networks.

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Section: Discussioncontrasting

confidence: 61%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Realization of a crosstalk-avoided quantum network node using dual-type qubits of the same ion species

Feng,

Huang,

et al. 2024

Nat Commun

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“…It is valuable for suppressing motional excitation during ion shuttling in the QCCD architecture. Meanwhile, proposals for hybrid encoding, by utilizing multiple energy levels of a single ion to encode different qubit types, have been made recently to construct hybrid systems with single ion species [473]. The interconversion of different qubit encoding on a single ion has been experimentally demonstrated [474].…”

Section: %mentioning

confidence: 99%

Noisy intermediate-scale quantum computers

Cheng

Deng

et al. 2023

Front. Phys.

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Quantum computers have made extraordinary progress over the past decade, and significant milestones have been achieved along the path of pursuing universal fault-tolerant quantum computers. Quantum advantage, the tipping point heralding the quantum era, has been accomplished along with several waves of breakthroughs. Quantum hardware has become more integrated and architectural compared to its toddler days. The controlling precision of various physical systems is pushed beyond the fault-tolerant threshold. Meanwhile, quantum computation research has established a new norm by embracing industrialization and commercialization. The joint power of governments, private investors, and tech companies has significantly shaped a new vibrant environment that accelerates the development of this field, now at the beginning of the noisy intermediate-scale quantum era. Here, we first discuss the progress achieved in the field of quantum computation by reviewing the most important algorithms and advances in the most promising technical routes, and then summarizing the next-stage challenges. Furthermore, we illustrate our confidence that solid foundations have been built for the fault-tolerant quantum computer and our optimism that the emergence of quantum killer applications essential for human society shall happen in the future.

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“…Moreover, phonon modes have been engineered to realize different properties, such as localization, squeezing, and non-classicality [15,16,20]. These achievements open up new possibilities for exploring quantum phenomena with phonons, such as quantum metrology, quantum thermodynamics, and quantum error correction [33][34][35]. Consequently, high accuracy phonon state preparation in ion traps is of great significance since it enables the manipulation of the vibrational states of ions and the control of their interactions with other ions and external fields.…”

Section: Introductionmentioning

confidence: 99%

Manipulation of phonon states in ion traps by shortcuts to adiabaticity

Yang,

Xie,

Zhang

et al. 2023

New J. Phys.

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Shortcuts to adiabaticity (STA) provides the possibility of high accuracy manipulation of phonon states in ion traps. We propose a scheme realized experimentally for manipulating phonon states using STA and confirmed its effectiveness through generating Fock states. Our results show that the duration of the STA manipulation of phonon states is 16 times faster than that of the adiabatic evolution, and the non-resonant excitation can be suppressed by laser bias frequency, which are confirmed by experimental results. Moreover, we also carried out an experimental research on the robustness of STA, showing good robustness respect to the pulse shape deformation, bias noises and stochastic noise. This might lead to a useful step toward realizing fast and noise-resistant quantum manipulation within current experimental capacity.

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Realizing coherently convertible dual-type qubits with the same ion species

Cited by 21 publications

References 34 publications

Realization of a crosstalk-avoided quantum network node using dual-type qubits of the same ion species

Realization of a crosstalk-avoided quantum network node using dual-type qubits of the same ion species

Noisy intermediate-scale quantum computers

Manipulation of phonon states in ion traps by shortcuts to adiabaticity

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