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5تقرير
المؤلفون: Radić, D., Gorelik, L. Y., Kulinich, S. I., Shekhter, R. I.
مصطلحات موضوعية: Condensed Matter - Mesoscale and Nanoscale Physics, ams.org
الوصف: We suggest a nanoelectromechanical setup and corresponding time protocol of its manipulation by which we transduce quantum information from charge qubit to nanomechanical cat state. The setup is based on the AC Josephson effect between bulk superconductors and mechanically vibrating mesoscopic superconducting island in the regime of the Cooper pair box. Starting with a pure state with quantum information initially encoded into superposition of the Cooper pair box states, applying a specially tailored time protocol upon bias voltage and gate electrodes, we obtain a new pure state with information finally encoded into superposition of nanomechanical coherent states constituting the cat state. This performance is achieved using quantum entanglement between electrical and mechanical states. Nanomechanical cat states serve as a storage of quantum information, motivated by significantly longer decoherence time with respect to the charge qubit states, from which the information can be transdued back to the charge qubit applying the reverse time protocol.
Comment: 6 pages, 4 picturesالوصول الحر: http://arxiv.org/abs/2305.00502Test
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6تقرير
المؤلفون: Kadigrobov, A. M., Keran, B., Radić, D.
المصدر: Physical Review B 104, 155143 (2021)
مصطلحات موضوعية: Condensed Matter - Strongly Correlated Electrons
الوصف: We investigate quantum dynamics and kinetics of a 2D conductor with closed Fermi surface reconstructed by a biaxial density wave, in which electrons move along a two-dimensional periodic net of semiclassical trajectories coupled by the magnetic breakdown tunnelling under a strong magnetic field. We derive a quasi-particle dispersion law and magnetoconductivity tensor. The quasi-particle spectrum is found to be the alternating series of two-dimensional magnetic energy bands with gaps between them. The longitudinal magnetoconductivity shows giant oscillations with change of magnetic field, while the Hall coefficient changes sign and is absent in a wide range of the magnetic fields in between. Preliminary estimations show that the suggested magnetoconductivity mechanism may be the origin of such behaviour of the Hall coefficient vs. magnetic field, as observed in experiments in materials with analogous topology of the Fermi surface, such as the high-Tc superconducting cuprates.
Comment: 11 pages, 4 figuresالوصول الحر: http://arxiv.org/abs/2110.14265Test
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7تقرير
المؤلفون: Jonson, M., Shekhter, R. I., Entin-Wohlman, O., Aharony, A., Park, H. C., Radić, D.
المصدر: Phys. Rev. B 100, 115406 (2019)
مصطلحات موضوعية: Condensed Matter - Mesoscale and Nanoscale Physics
الوصف: An unbiased one-dimensional weak link between two terminals, subjected to the Rashba spin-orbit interaction caused by an AC electric field which rotates periodically in the plane perpendicular to the link, is shown to inject spin-polarized electrons into the terminals. The injected spin-polarization has a DC component along the link and a rotating transverse component in the perpendicular plane. In the adiabatic, low rotation-frequency regime, these polarization components are proportional to the frequency. The DC component of the polarization vanishes for a linearly-polarized electric field.
Comment: published versionالوصول الحر: http://arxiv.org/abs/1903.03321Test
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المؤلفون: Radic, D., Gorelik, L. Y., Kulinich, S. I., Shekhter, Robert I., 1947
المصدر: PHYSICA B-CONDENSED MATTER. 684
مصطلحات موضوعية: Physical Sciences, Fysik, Superconducting nanoelectromechanical, systems, AC Josephson effect, Transmission of quantum information, Nanomechanical coherent states, Charge qubit
الوصف: We suggest a nanoelectromechanical setup and corresponding time -protocol for controlling parameters in order to demonstrate nanomechanical manipulation of superconducting charge-qubit quantum network. We illustrate it on an example reflecting important task for quantum information processing - transmission of quantum information between two charge-qubits facilitated by nanomechanics. The setup is based on terminals utilizing the AC Josephson effect between bias voltage -controlled bulk superconductors and mechanically vibrating mesoscopic superconducting grain in the regime of the Cooper pair box, controlled by the gate voltage. The described manipulation of quantum network is achieved by transduction of quantum information between charge-qubits and intentionally built nanomechanical coherent states, which facilitate its transmission between qubits. This performance is achieved using quantum entanglement between electrical and mechanical states.
الوصول الحر: https://gup.ub.gu.se/publication/339084Test
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9دورية أكاديمية
المؤلفون: GARGALLO, L, GATICA, N, RADIC, D
مصطلحات موضوعية: BLENDS, POLY(MONOALKYLITACONATES), POLY(VINYLPYRIDINES), SUCCINIC ACID DERIVATIVES, MISCIBILITY, COMPATIBILITY, DILUTE-SOLUTION, VISCOMETRIC BEHAVIOR, ITACONATE), 12 Responsible Consumption and Production, 12 Producción y consumo responsable
الوصف: The compatibility in blends containing poly(monoalkylitaconates) (PMAI) and poly(vinylpyridines (PVPy) by several analytic techniques i.e, viscometry, UV-VIS spectrophotometry, Differential Scanning Calorimetry (DSC) Furier Transform Infrared Spectrophotometry (FTIR) was studied. Blends of PVPy with PMAI give rise to insoluble products irrespective of the starting composition, which can be attributed to interpolymer complex formation. From UV-VIS it is possible to observe miscibility behaviour between polymers. By DSC the thermograms observed are similar to those of PMAI but different from those of pure PVPy. A variation of the wavenumber of the carbonyl group of PMAI with composition is observed by FTIR, which is another argument to suspect miscibility. In order to study the effect of the molecular weight of the components on the miscibility, the analysis of blends containing PVPy and the corresponding poly(moalkylitaconates) monomer analogues was performed. Compatibility is observed in these cases but with important differences between the magnitudes of the variations relative to the polymeric blends. Miscibility is unfavoured as the molecular weight of the components increases, in good agreement with theory.
وصف الملف: 9 páginas; application/pdf
العلاقة: https://doi.org/10.1080/00914039408038298Test; https://repositorio.uc.cl/handle/11534/78051Test; WOS:A1994QT51700014
الإتاحة: https://doi.org/10.1080/00914039408038298Test
https://repositorio.uc.cl/handle/11534/78051Test -
10دورية أكاديمية
المؤلفون: OPAZO, A, GARGALLO, L, RADIC, D
مصطلحات موضوعية: BLENDS, POLY(N-VINYL-2-PYRROLIDONE), POLY(DIALKYL ITACONATES), POLY(METHACRYLATES), DIFFERENTIAL SCANNING CALORIMETRY, THERMOMECHANICAL ANALYSIS, MISCIBILITY, BEHAVIOR, 12 Responsible Consumption and Production, 12 Producción y consumo responsable
الوصف: Blends containing poly(N-vinyl-2-pyrrolidone) (PVP) and poly(dialkyl itaconates) (PDI) and poly(methacrylates) (PMA) with different side chain structures were prepared. polymer blends of various compositions were studied by Differential Scanning Calorimetry (DSC) and Thermomechanical Analysis (TMA). The effect of the substitution on the lateral chain is also analyzed. One Tg value, over the whole range of compositions is observed for the majority of the blends reflecting compatibility. Inmiscible polymer blends are also observed which is apparently dependent on the structure of the side chain.
وصف الملف: 9 páginas; application/pdf
العلاقة: https://doi.org/10.1080/00914039408038299Test; https://repositorio.uc.cl/handle/11534/76933Test; WOS:A1994QT51700015
الإتاحة: https://doi.org/10.1080/00914039408038299Test
https://repositorio.uc.cl/handle/11534/76933Test
