Passive Phase Shifter for Superconducting Josephson Circuits

Balashov, D; Dimov, B.; Khabipov, M.; Ortlepp, Thomas; Hagedorn, D.; Zorin, A. B.; Buchholz, F.-I.; Uhlmann, Friedrich; Niemeyer, J.

doi:10.1109/tasc.2007.897382

Cited by 22 publications

(26 citation statements)

References 10 publications

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“…Operation of the circuits with the phase shifting element based on frozen flux quanta [20] has been tested earlier in Ref. [21]. Here we present the first demonstration of the functioning of an SFS π-phase shifter integrated in a conventional Nb SFQ circuit.…”

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confidence: 86%

Implementation of superconductor/ferromagnet/ superconductor π-shifters in superconducting digital and quantum circuits

et al. 2010

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The difference between the phases of superconducting order parameter plays in superconducting circuits the role similar to that played by the electrostatic potential difference required to drive a current in conventional circuits. This fundamental property can be altered by inserting in a superconducting circuit a particular type of weak link, the so-called Josephson π-junction having inverted current-phase relation and enabling a shift of the phase by π. We demonstrate the operation of three superconducting circuits -two of them are classical and one quantum -which all utilize such π-phase shifters realized using superconductor-ferromagnet-superconductor sandwich technology. The classical circuits are based on single-flux-quantum cells, which are shown to be scalable and compatible with conventional niobium-based superconducting electronics. The quantum circuit is a π-phase biased qubit, for which we observe coherent Rabi oscillations and compare the measured coherence time with that of conventional superconducting phase qubits. 1 arXiv:1005.1581v1 [cond-mat.supr-con]

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confidence: 86%

Implementation of superconductor/ferromagnet/ superconductor π-shifters in superconducting digital and quantum circuits

et al. 2010

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“…It is anticipated that unconventional junctions either with a fixed phase shift ϕ 0 (ϕ-junctions), or with an in-built spatial phase variation along the junction ∆ϕ (0 − ϕ junctions) may provide additional functionality in Josephson electronics [1][2][3][4]. For example, they can operate as autonomous and persistent phase batteries -one of key elements of quantum [1,[5][6][7][8][9][10][11][12][13][14] and digital Josephson electronics [2,3,15,16]. Such junctions can be also used for development of novel types of cryogenic memory [17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Two mechanisms of Josephson phase shift generation by an Abrikosov vortex

2019

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Abrikosov vortex contains magnetic field and circulating currents that decay at a short range λ ∼ 100 nm. However, the vortex can induce a long range Josephson phase shift at distances r ∼ µm λ. The mechanism of this puzzling phenomenon is not clearly understood. Here we present a systematic study of vortex-induced phase shift in planar Josephson junctions. We make two key observations: (i) The cutoff effect: although vortexinduce phase shift is a long-range phenomenon, it is terminated by the junction and does not persists beyond it. (ii) A crossover from linear to superlinear dependence of the phase shift on the vortex polar angle occurs upon approaching of the vortex to the junction. The crossover occurs at a distance comparable with the penetration depth. This, together with theoretical and numerical analysis of the problem, allows unambiguous identification of two distinct and independent mechanisms. The short range mechanism is due to circulating vortex currents inside superconducting electrodes without involvement of magnetic field. The long range mechanism is due to stray magnetic fields outside electrodes without circulating vortex currents. We argue that understanding of controlling parameters of vortex-induced Josephson phase shift can be used for development of compact and fast electronic devices with low dissipation power.

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“…Similar phase shifters have been used for digital RSFQ electronics. 14 , 15 Recently it was shown that an Abrikosov vortex can induce a JPS in nearby JJs in the full [−2π, + 2π] range. 23 , 43 , 44 Since vortices can be easily manipulated (displaced, introduced, or removed) by magnetic field, H , 23 , 45 − 47 current, I , 20 , 48 , 49 and light, 50 , 51 they can be used for creation of memory cells 20 and tunable phase shifters.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable Josephson Phase Shifter

et al. 2021

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Phase shifter is one of the key elements of quantum electronics. In order to facilitate operation and avoid decoherence, it has to be reconfigurable, persistent, and nondissipative. In this work, we demonstrate prototypes of such devices in which a Josephson phase shift is generated by coreless superconducting vortices. The smallness of the vortex allows a broad-range tunability by nanoscale manipulation of vortices in a micron-size array of vortex traps. We show that a phase shift in a device containing just a few vortex traps can be reconfigured between a large number of quantized states in a broad [−3π, +3π] range.

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Passive Phase Shifter for Superconducting Josephson Circuits

Cited by 22 publications

References 10 publications

Implementation of superconductor/ferromagnet/ superconductor π-shifters in superconducting digital and quantum circuits

Implementation of superconductor/ferromagnet/ superconductor π-shifters in superconducting digital and quantum circuits

Two mechanisms of Josephson phase shift generation by an Abrikosov vortex

Reconfigurable Josephson Phase Shifter

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