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Koshelets VP, Dmitriev PN, Ermakov AB, Filippenko LV, Sobolev AS, Torgashin MY, et al. Superconducting flux-flow oscillators for THz integrated receiver [abstract]. In: Presented at the second Franco-Russian Seminar on Nanotechnologies. Lille, France; 2005.
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Vaks VL, Kurin VV, Pankratov AL, Koshelets VP. Investigation of spectral properties of phase-focked flux flow oscillator [abstract]. In: ISEC. Netherlands; 2005. PD-04.
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Hoogeveen RWM, Yagoubov PA, de Lange A, Selig AM, Koshelets VP, Ellison B. N., et al. Superconducting integrated receiver development for TELIS. In: Proc. 12th International Symposium on Remote Sensing. Bruges, Belgium; 2005.
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Koshelets VP, Borisov VB, Dmitriev PN, Ermakov AB, Filippenko LV, Khudchenko AV, et al. Integrated submillimeter receiver for TELIS. Joint International Workshop “Nanosensors and Arrays of Quantum Dots and Josephson Junctions for space applications”, 10th International Workshop “From Andreev Reflection to the Earliest Universe”. 2006.
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Feofanov AK, Oboznov VA, Bol'Ginov VV, Lisenfeld J, Poletto S, Ryazanov VV, et al. Implementation of superconductor/ferromagnet/ superconductor. Nat Phys. 2010;6(8):593–7.
Abstract: High operation speed and low energy consumption may allow the superconducting digital single-flux-quantum circuits to outperform traditional complementary metal-oxide-semiconductor logic. The remaining major obstacle towards high element densities on-chip is a relatively large cell size necessary to hold a magnetic flux quantum Φ0. Inserting a π-type Josephson junction in the cell is equivalent to applying flux Φ0/2 and thus makes it possible to solve this problem. Moreover, using π-junctions in superconducting qubits may help to protect them from noise. Here we demonstrate the operation of three superconducting circuits-two of them are classical and one quantum-that 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-biased phase qubit, for which we observe coherent Rabi oscillations. We find no degradation of the measured coherence time compared to that of a reference qubit without a π-junction.
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