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Design and Fabrication of On-Chip Coil Integrated Superconducting Tunnel Junction

Toru Taino, Kazuro Kikuchi, Hirosi Nakagawa, Masahiro Aoyagi, Hiroshi Akoh, Keisuke Maehata, Tetsuya Ariyoshi, A. Hora, Kenji Ishibashi, H. Sato, Hirohiko M. Shimizu

Published Jan 1, 2003• 0 citations
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SFQ Multiplexed Signal Processing Circuits for STJ Photon Detector Arrays

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We have been studying single flux quantum (SFQ) digital signal processing (DSP) circuits for superconducting tunnel junction (STJ) photon detector arrays. The proposed DSP circuit consists of a binary tree of multiplexers, a time counter, a binary counter, and a readout memory. Each multiplexer was designed such that the first arriving SFQ pulse train connects to the binary counter until the time counter reaches a set value. The time counter is set to a sufficiently long time compared with the response time of STJ photon detector. After processing the multiplexer, SFQ pulses are integrated by the binary counter. The number of integrated SFQ pulses is proportional to the number of quasi-particles generated by photon irradiation in an STJ. After the time counter reaches the set value, the time counter generates a set SFQ pulse to set the multiplexer in the ready state, the integrated value is sent to the readout memory and then the binary counter is reset. The binary tree of multiplexers could be extended to have address bits for photon imaging using an STJ array. One key component of the proposed DSP circuit was fabricated and its operation using an on-chip clock generator was successfully demonstrated.

IEEE Transactions on Applied Superconductivity•Jun 1, 2009•4 citations
We present the design of a passive, on-chip microwave circulator based on a ring of superconducting tunnel junctions. We investigate two distinct physical realizations, based on Josephson junctions (JJs) or quantum phase slip elements (QPS), with microwave ports coupled either capacitively (JJ) or inductively (QPS) to the ring structure. A constant bias applied to the center of the ring provides an effective symmetry breaking field, and no microwave or rf bias is required. We show that this design offers high isolation, robustness against fabrication imperfections and bias fluctuations, and a bandwidth in excess of 500 MHz for realistic device parameters.
We present a lithographically manufactured chip with niobium thin-film pancake coils, and a washerlike structure above this coil for focusing flux. Due to a wide range of coupling coefficients, various samples can be investigated in flip-chip or on-chip configuration, with the aim of evaluating the superconducting current-phase relation. With this, structures with dimensions in the order of 10 μm were coupled to the resonance circuit with coupling coefficients from 10−3 up to 0.9. Resonance frequencies in the 10 MHz range and quality factors of about 500 were obtained with external capacitors. Furthermore, the chip is designed to facilitate the manufacture of superconducting qubits in the center of the coil. This offers the possibility of combining on one chip novel technologies for fabricating superconducting qubits along with high-quality tank circuits for studying the qubits.
We have been studying single flux quantum (SFQ) digital signal processing (DSP) circuits for superconducting tunnel junction (STJ) photon detector arrays. The proposed DSP circuit consists of a binary tree of multiplexers, a time counter, a binary counter, and a readout memory. Each multiplexer was designed such that the first arriving SFQ pulse train connects to the binary counter until the time counter reaches a set value. The time counter is set to a sufficiently long time compared with the response time of STJ photon detector. After processing the multiplexer, SFQ pulses are integrated by the binary counter. The number of integrated SFQ pulses is proportional to the number of quasi-particles generated by photon irradiation in an STJ. After the time counter reaches the set value, the time counter generates a set SFQ pulse to set the multiplexer in the ready state, the integrated value is sent to the readout memory and then the binary counter is reset. The binary tree of multiplexers could be extended to have address bits for photon imaging using an STJ array. One key component of the proposed DSP circuit was fabricated and its operation using an on-chip clock generator was successfully demonstrated.