Spin–Lattice Relaxation Decoherence Suppression in Vanishing Orbital Angular Momentum Qubits

Buch, Christian Dirk; Kundu, Krishnendu; Marbey, Jonathan; Tol, Johan van; Weihe, Høgni; Hill, Stephen; Piligkos, Stergios

doi:10.1021/jacs.2c07057

Cited by 8 publications

(9 citation statements)

References 62 publications

(85 reference statements)

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“…It is desirable to compare the coherence times of 1Gd0.12 % with other Gd III ‐based molecular qubits (Table S5). These values of 1Gd0.12 % are superior to most studies, but surpassed by f ‐P2‐Z⋅Gd 2 [18b] (9.8 μ s, 3 K) with a strongly delocalized π‐conjugated backbone and Gd(trensal) [18c] (12 μ s, 3 K) due to the superposition of sublevels. It is worth noting that there is an obvious coherent oscillation in the intensity of echo decay in diluted 1Gd0.12 % and 1sol (Figures 4d and S12b), which are attributed to electron spin echo envelope modulation (ESEEM) from the hyperfine interaction between the electron spins and the surrounding nuclear spins [36] .…”

Section: Resultsmentioning

confidence: 55%

Spin Qubit in a 2D Gd^IIINa^I‐Based Oxamato Supramolecular Coordination Framework

Wang,

Jing,

Cui

et al. 2023

Chemistry A European J

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Qubits are the basic unit of quantum information and computation. To realize quantum computing and information processing, the decoherence times of qubits must be long enough. Among the studies of molecule‐based electron spin qubits, most of the work focused on the ions with the spin S=1/2, where only single‐bit gates can be constructed. However, quantum operations require the qubits to interact with each other, so people gradually carry out relevant research in ions or systems with S>1/2 and multilevel states. In this work, a two‐dimensional (2D) oxygen‐coordinated GdIIINaI‐based oxamato supramolecular coordination framework, Na[Gd(4‐HOpa)4(H2O)] ⋅ 2H2O (1, 4‐HOpa=N‐4‐hydroxyphenyloxamate), was selected as a possible carrier of qubit. The field‐induced slow magnetic relaxation shows this system has phonon bottleneck (PB) effect at low temperatures with a very weak magnetic anisotropy. The pulse electron paramagnetic resonance studies show the spin‐lattice and spin‐spin relaxation times are T1=1.66 ms at 4 K and Tm=4.25 μs at 8 K for its diamagnetically diluted sample (1Gd0.12 %). It suggested that the relatively long decoherence time is mainly ascribed to its near isotropic and the PB effect from resonance phonon trapped for pure sample, while the dilution further improves its qubit performance.

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Section: Resultsmentioning

confidence: 55%

Spin Qubit in a 2D Gd^IIINa^I‐Based Oxamato Supramolecular Coordination Framework

Wang,

Jing,

Cui

et al. 2023

Chemistry A European J

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“…24,25 In particular, Ln coordination complexes have been proposed for applications in Quantum Information Technologies (QITs). 21,23,[26][27][28][29][30][31][32][33] Within the context of QITs, the number of performed quantum operations is limited by the phase memory time, T m , and the operation (gate) time. The upper limit of T m is defined by the spin-lattice relaxation time, T 1 .…”

Section: Introductionmentioning

confidence: 99%

Structural isomerism-tuned magnetisation relaxation dynamics in lanthanide coordination complexes

Hansen,

Buch,

Piligkos

2024

Inorg. Chem. Front.

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“…This results in ground state splitting of typically less than 1 cm –1 which is the perfect magnitude for rich EPR spectra as well as relaxation times that are still relatively long . Gd 3+ doped into yttrium(III) complexes are presently being studied as potential qubits. − …”

Section: Introductionmentioning

confidence: 99%

Electron Paramagnetic Resonance Spectra of Pentagonal Bipyramidal Gadolinium Complexes

et al. 2023

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Gadolinium is a special case in spectroscopy because of the near isotropic nature of the 4f7 configuration of the +3 oxidation state. Gd3+ complexes have been studied in several symmetries to understand the underlying mechanisms of the ground state splitting. The abundance of information in Gd3+ spectra can be used as a probe for properties of the other rare earth ions in the same complexes. In this work, the zero-field splitting (ZFS) of a series of Gd3+ pentagonal bipyramidal complexes of the form [GdX1X2(Leq)5] n+ [n = 1, X = axial ligands: Cl–, –O t Bu, –OArF5 or n = 3, X = t BuPO(NH i Pr)2, Leq = equatorial ligand: Py, THF or H2O] with near fivefold symmetry axes along X1-Gd-X2 was investigated. The ZFS parameters were determined by fitting of room-temperature continuous wave electron paramagnetic resonance (EPR) spectra (at X-, K-, and Q-band) to a spin Hamiltonian incorporating extended Stevens operators compatible with C 5 symmetry. Examination of the acquired parameters led to the conclusion that the ZFS is dominated by the B 2 0 term and that the magnitude of B 2 0 is almost entirely dependent on, and inversely proportional to, the donor strength of the axial ligands. Surveying the continuous shape measure and the X1-Gd-X2 angle of the complexes showed that there is some correlation between the proximity of each complex to D 5h symmetry and the magnitude of the B 6 5 parameter, but that the deformation of the X1-Gd-X2 angle is more significant than other distortions. Finally, the magnitude of B 2 0 was found to be inversely proportional to the thermal barrier for the reversal of the magnetic moment (U eff) of the corresponding isostructural Dy3+ complexes.

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Spin–Lattice Relaxation Decoherence Suppression in Vanishing Orbital Angular Momentum Qubits

Cited by 8 publications

References 62 publications

Spin Qubit in a 2D Gd^IIINa^I‐Based Oxamato Supramolecular Coordination Framework

Spin Qubit in a 2D Gd^IIINa^I‐Based Oxamato Supramolecular Coordination Framework

Structural isomerism-tuned magnetisation relaxation dynamics in lanthanide coordination complexes

Electron Paramagnetic Resonance Spectra of Pentagonal Bipyramidal Gadolinium Complexes

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Spin–Lattice Relaxation Decoherence Suppression in Vanishing Orbital Angular Momentum Qubits

Cited by 8 publications

References 62 publications

Spin Qubit in a 2D GdIIINaI‐Based Oxamato Supramolecular Coordination Framework

Spin Qubit in a 2D GdIIINaI‐Based Oxamato Supramolecular Coordination Framework

Structural isomerism-tuned magnetisation relaxation dynamics in lanthanide coordination complexes

Electron Paramagnetic Resonance Spectra of Pentagonal Bipyramidal Gadolinium Complexes

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Spin Qubit in a 2D Gd^IIINa^I‐Based Oxamato Supramolecular Coordination Framework

Spin Qubit in a 2D Gd^IIINa^I‐Based Oxamato Supramolecular Coordination Framework