Temperature dependence of a width of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si3.svg"><mml:mrow><mml:mstyle mathvariant="normal"><mml:mi>Δ</mml:mi></mml:mstyle><mml:mi>H</mml:mi><mml:mo linebreak="goodbreak">=</mml:mo><mml:mstyle mathvariant="normal"><mml:mi>Δ</mml:mi></mml:mstyle><mml:mi>B</mml:mi></mml:mrow></mml:math> region in 5 wt.% (Fe, Ti) particle-doped MgB<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:msub><mml:mrow/><mml:mn>2</mml:mn></mml:

Lee, H.B.; Kim, G.C.; Park, Hong Jo; Kim, Y.C.

doi:10.1016/j.physc.2021.1353827

Cited by 2 publications

(3 citation statements)

References 9 publications

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“…Comparing theoretical values with the experimental results as shown in Table I, ∆H=∆B region widths of 5 wt.%, 10 wt.%, 25 wt.%, and 1 wt.% are experimentally 1.5 Tesla (T), 1.0 T, 0.5 T, and 0.6 T, respectively, as shown Fig. 3 [18]. 1 wt.% specimen shows a good match with theoretical value (0.6 T/1.5 T = 0.4).…”

Section: And a Rate Of Increased Pinning Sites By Over-doping Ismentioning

confidence: 73%

Flux-Pinning Effects and Mechanism of Water-Quenched 5 wt.% (Fe, Ti) Particle-Doped MgB2 Superconductor

Lee

Kim

Jeen

et al. 2020

J Supercond Nov Magn

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Section: And a Rate Of Increased Pinning Sites By Over-doping Ismentioning

confidence: 73%

Flux-Pinning Effects and Mechanism of Water-Quenched 5 wt.% (Fe, Ti) Particle-Doped MgB2 Superconductor

Lee

Kim

Jeen

et al. 2020

J Supercond Nov Magn

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“…It is shown that pinned fluxes are moving as a bundle from a volume defect to another. The behavior of fluxes which are moving as a bundle was observed experimentally by Bonevich [23], and ∆H=∆B region is well represented in (Fe, Ti) doped MgB 2 [17,18].…”

Section: Introductionmentioning

confidence: 73%

“…In addition, the qubit behavior is possible even 25 K when MgB 2 superconductor are used as a base material because MgB 2 showed flux-pinning effects of volume defects at 25 K [17,18].…”

Section: Introductionmentioning

confidence: 99%

Quantum Bit Behavior of Pinned Fluxes on Volume Defects in a Superconductor

Lee¹,

Kim²,

Kim³

et al. 2022

Preprint

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We studied a qubit based on flux-pinning effects in ∆H=∆B region of a superconductor. When volume defects are many enough in a superconductor, ∆H=∆B region on M-H curve is formed, which is the region that increased applied magnetic field (∆H) is the same as increasing magnetic induction (∆B). Magnetization (M) is constant in the region by 4πM = B -H. Here we show that the behavior of fluxes in ∆H=∆B region can be a candidate of qubit. Pinned fluxes on volume defects would move as a bundle in the region by repeating flux-pinning and pick-out depinning process from the surface to the center of the superconductor. During the process, magnetic fluxes would exist as one of states that are flux-pinning state at volume defects and pick-out depinning state in which fluxes are moving in the superconductor. A difference of diamagnetic property occurs between pinning state at volume defects and depinning state from the volume defects.Thus, diamagnetic properties of the superconductor would oscillate in ∆H=∆B region and the behavior would be observed in M-H curve. The oscillation can be used for qubit by setting the pinning state at volume defects as |1 and the depinned state as |0 . This method can operate at higher temperatures than that of using Josephson Junctions. In addition, it is expected that the device is quite simple and decoherences can be almost negligible.

show abstract

Temperature dependence of a width of ΔH=ΔB region in 5 wt.% (Fe, Ti) particle-doped MgB2

Cited by 2 publications

References 9 publications

Flux-Pinning Effects and Mechanism of Water-Quenched 5 wt.% (Fe, Ti) Particle-Doped MgB2 Superconductor

Flux-Pinning Effects and Mechanism of Water-Quenched 5 wt.% (Fe, Ti) Particle-Doped MgB2 Superconductor

Quantum Bit Behavior of Pinned Fluxes on Volume Defects in a Superconductor

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Temperature dependence of a width of ΔH=ΔB region in 5 wt.% (Fe, Ti) particle-doped MgB2

Cited by 2 publications

References 9 publications

Flux-Pinning Effects and Mechanism of Water-Quenched 5 wt.% (Fe, Ti) Particle-Doped MgB2 Superconductor

Flux-Pinning Effects and Mechanism of Water-Quenched 5 wt.% (Fe, Ti) Particle-Doped MgB2 Superconductor

Quantum Bit Behavior of Pinned Fluxes on Volume Defects in a Superconductor

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Temperature dependence of a width of ΔH=ΔB region in 5 wt.% (Fe, Ti) particle-doped MgB2