Ytterbium ion trap quantum computing: The current state-of-the-art

Nop, Gavin; Paudyal, Durga; Smith, Jonathan D. H.

doi:10.1116/5.0065951

Cited by 10 publications

(5 citation statements)

References 49 publications

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“…Such a degree of freedom is a rather unique opportunity offered by molecular nanomagnets, which can be exploited to significant speedup two-qudit gates. In particular, for a spin S system described by Hamiltonian (2), transitions between |m i = 0 and |m i = ±1 states (the lowest energy ones in the presence of easy plane anisotropy and at low field) are enhanced by a factor √ S(S + 1) compared to a spin 1/2. To fully exploit this degree of freedom, we consider in the following two S = 10 qudits, with D i /2π ≈ 7 − 8 GHz and spin transitions always involving a |m i = 0 state (here and in the following, parameters are in units of ).…”

Section: Working Principles Of the Molecular Spin Quantum Processormentioning

confidence: 99%

“…For proper choice of the interaction time τ , this evolution implements entangling gates such as the iSWAP or the √ iSWAP. The resulting gating time (to implement, e.g., an iSWAP) is given by τ 2q = π /2(G m i ) 2 . With the parameters employed here, τ 2q ∼ 6 µs, thus making two-qudit gates implemented with the dispersive approach rather slow and hence prone to decoherence.…”

Section: Two-qudit Gatesmentioning

confidence: 99%

“…Recent advances in the realization of quantum chips with gradually better performances (both in the number of qubits and in the fidelity of operations) [1][2][3][4][5][6][7][8] could stimulate the question: is it still worth to pursue other routes different from the most established technologies? Are there fundamental issues (not barely technical problems), which could be more easily tackled by alternative platforms, potentially in the short term?…”

Section: Introductionmentioning

confidence: 99%

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Blueprint for a Molecular-Spin Quantum Processor

et al. 2023

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The implementation of a universal quantum processor still poses fundamental issues related to error mitigation and correction, which demand investigation of also platforms and computing schemes alternative to the main stream. A possibility is offered by employing multilevel logical units (qudits), naturally provided by molecular spins. Here we present the blueprint of a molecular spin quantum processor consisting of single molecular nanomagnets, acting as qudits, placed within superconducting resonators adapted to the size and interactions of these molecules to achieve a strong single spin-to-photon coupling. We show how to implement a universal set of gates in such a platform and to readout the final qudit state. Singlequdit unitaries (potentially embedding multiple qubits) are implemented by fast classical drives, while an alternative scheme is introduced to obtain two-qubit gates via resonant photon exchange. The latter is compared to the dispersive approach, finding in general a significant improvement. The performance of the platform is assessed by realistic numerical simulations of gate sequences, such as Deutsch-Josza and quantum simulation algorithms. The very good results demonstrate the feasibility of the molecular route towards a universal quantum processor.

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Section: Working Principles Of the Molecular Spin Quantum Processormentioning

confidence: 99%

Section: Two-qudit Gatesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Blueprint for a Molecular-Spin Quantum Processor

et al. 2023

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“…In recent years, there has been extensive advancement in research works on building quantum computers/simulators, clocks and sensors. Of the many ionic candidates, Ytterbium ion (Yb + ) is in prime focus, and its isotopes Yb 171 , Yb 172 and Yb 174 are used for the accomplishment of frequency metrology, quantum information processing, quantum computation and simulation [1,22,23]. For the successful realization of all such experiments, minimizing the inherent motion of the trapped Yb + is an indispensable step that is achieved by probing its cooling transition 2 S 1/2 → 2 P 1/2 at 369.526 nm.…”

Section: Introductionmentioning

confidence: 99%

Stabilizing Frequency of a Diode Laser to a Reference Transition of Molecular Iodine through Modulation Transfer Spectroscopy

Sharma,

Roy,

Panja

et al. 2023

Atoms

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We report the frequency stabilization of an external cavity diode laser (ECDL) to a reference molecular iodine (I2) transition at 13,531.18 cm−1 (739.03382 nm). Using the Modulation Transfer Spectroscopy (MTS) method for the highly sensitive detection of weak absorption signals, the Doppler-free absorption peaks of I2 corresponding to the hot band transition R(78) (1–11) are resolved. The ECDL’s frequency is stabilized with respect to one of the lines lying within the reference absorption band. For this, the iodine vapor cell is heated to 450 °C and the corresponding circularly polarized pump and probe beam powers are maintained at 10 mW and 1 mW, respectively, to avoid power broadening. The short (100 ms) and long-term (50 h) linewidths of the frequency stabilized laser are measured to be 0.75(3) MHz and 0.5(2) MHz, respectively, whereas the natural linewidth of the specific I2-transitions lie within a range of tens of MHz.

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“…Organic light-emitting diodes (OLEDs) find wide applicability nowadays . The zone of special interest is near-infrared (NIR) emitting materials, which can be applied for telecommunication, quantum computing, and many other areas. − The key to the bright luminescence of NIR-emitting OLEDs is efficient intersystem crossing (ISC) and subsequent phosphorescence processes. However, electronic transitions with spin changing are generally restricted and possess high intensity when mixing between different spin states via spin–orbital coupling, which are significant.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Ability of C₆H₅I to Phosphoresce

2023

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The heavy atom effect is a widely utilized strategy to enhance the phosphorescence intensity of organic molecules. Among the preferred choices, heavy halogen atoms such as bromine (Br) or iodine (I) have gained popularity. However, the incorporation of these heavy atoms can introduce challenges due to the presence of unstable excited states that undergo dissociation upon excitation. This study focuses on investigating the excited states of the C6H5I molecule, with particular emphasis on the intricate interplay of spin-orbital coupling effects, employing multireference ab initio methodologies. The absence of phosphorescence in the C6H5I molecule is attributed to the efficient energy transfer to dissociative excited states and the near-zero spin–orbital coupling between stable triplet sub-levels and the ground singlet state. To gain insights into the explicit dynamics of the excited states, the research employed Ehrenfest dynamics driven by real-time time-dependent density functional theory (TDDFT). Furthermore, the study explored the complete active space compositions and various post-CASSCF (complete active space self-consistent field) approaches.

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Ytterbium ion trap quantum computing: The current state-of-the-art

Cited by 10 publications

References 49 publications

Blueprint for a Molecular-Spin Quantum Processor

Blueprint for a Molecular-Spin Quantum Processor

Stabilizing Frequency of a Diode Laser to a Reference Transition of Molecular Iodine through Modulation Transfer Spectroscopy

Analysis of the Ability of C₆H₅I to Phosphoresce

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Ytterbium ion trap quantum computing: The current state-of-the-art

Cited by 10 publications

References 49 publications

Blueprint for a Molecular-Spin Quantum Processor

Blueprint for a Molecular-Spin Quantum Processor

Stabilizing Frequency of a Diode Laser to a Reference Transition of Molecular Iodine through Modulation Transfer Spectroscopy

Analysis of the Ability of C6H5I to Phosphoresce

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Product

Resources

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Analysis of the Ability of C₆H₅I to Phosphoresce