TY  - JOUR
AU  - Feofanov, A. K.
AU  - Oboznov, V. A.
AU  - Bol'Ginov, V. V.
AU  - Lisenfeld, J.
AU  - Poletto, S.
AU  - Ryazanov, V. V.
AU  - Rossolenko, A. N.
AU  - Khabipov, M.
AU  - Balashov, D.
AU  - Zorin, A. B.
AU  - Dmitriev, P. N.
AU  - Koshelets, V. P.
AU  - Ustinov, A. V.
PY  - 2010
DA  - 2010//
TI  - Implementation of superconductor/ferromagnet/ superconductor
T2  - Nat. Phys.
JO  - Nature Physics
SP  - 593
EP  - 597
VL  - 6
IS  - 8
KW  - fromIPMRAS
AB  - 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.
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=805), last updated on Wed, 09 May 2012 11:59:41 -0500
ID  - Feofanov_etal2010
ER  -