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Long-range coupling and scalable architecture for superconducting flux qubits

Austin G. Fowler, William F. Thompson, Zhizhong Yan, Ashley M. Stephens, B. L. T. Plourde, Frank K. Wilhelm
2007 Physical Review B  
This mechanism is then used as the basis of two scalable architectures for flux qubits taking into account crosstalk and fault-tolerant considerations such as permitting a universal set of logical gates  ...  With this thought in mind, we take the superconducting flux qubit coupling mechanism described in PRB 70, 140501 (2004) and extend it to allow approximately 500 MHz coupling of square flux qubits, 50 um  ...  This work was supported by a NSERC Discovery Grant and the European Union through EuroSQIP.  ... 
doi:10.1103/physrevb.76.174507 fatcat:6fw4ui3pkjgetdnx44jdastpy4

Long-range coupling and scalable architecture for superconducting flux qubits

A G Fowler, W F Thompson, Z Yan, A M Stephens, B L.T. Plourde, F K Wilhelm
2008 Canadian journal of physics (Print)  
This mechanism is then used as the basis of two scalable architectures for flux qubits taking into account cross-talk and fault-tolerant considerations such as permitting a universal set of logical gates  ...  With this thought in mind, we take the superconducting flux qubit coupling mechanism described by Plourde et al. ͓Phys. Rev.  ...  This work was supported by a NSERC Discovery Grant and the European Union through EuroSQIP.  ... 
doi:10.1139/p07-203 fatcat:sec6zkzrvvcitb7jxvbn2kykne

Development of Quantum Annealer using Josephson Parametric Oscillators

Tomohiro YAMAJI, Masayuki SHIRANE, Tsuyoshi YAMAMOTO
2021 IEICE transactions on electronics  
A Josephson parametric oscillator (JPO) is an interesting system from the viewpoint of quantum optics because it has two stable self-oscillating states and can deterministically generate quantum cat states  ...  Proof-of-concept experiments have been actively conducted for application to quantum computations. This article provides a review of the mechanism of JPOs and their application as a quantum annealer.  ...  This paper is based on results obtained from a project, JPNP16007, commissioned by the New Energy and Industrial Technology Development Organization (NEDO).  ... 
doi:10.1587/transele.2021sep0006 fatcat:s57mniq45ffozoqgqtii6ssbje

Circuit design for multi-body interactions in superconducting quantum annealing systems with applications to a scalable architecture

N. Chancellor, S. Zohren, P. A. Warburton
2017 npj Quantum Information  
It is then shown how this circuit can be used as the unit cell of a scalable architecture by applying it to a recently proposed embedding technique for constructing an architecture of logical qubits with  ...  The main result is an efficient circuit design of such multi-body terms using superconducting flux qubits in which effective N-body interactions are implemented using N ancilla qubits and only two inductive  ...  S.Z. acknowledges support by Nokia Technologies, Lockheed Martin, and the University of Oxford through the Quantum Optimization and Machine Learning (QuOpaL) Project.  ... 
doi:10.1038/s41534-017-0022-6 fatcat:7tdeufzznjdtto7nkiargzflay

Picosecond On-Chip Qubit Control Circuitry

T.A. Ohki, M. Wulf, M.F. Bocko
2005 IEEE transactions on applied superconductivity  
Elimination of redundant circuit elements by innovative use of fundamental elements allows smallscale control circuitry.  ...  The motivation of this design is to minimize the necessary bias leads and power dissipation for an SFQ based control circuit.  ...  We have designed and tested an SFQ circuit that will be used in an experiment to measure the quantum coherent oscillation of the phase in a superconducting hysteretic dc-SQUID phase qubit.  ... 
doi:10.1109/tasc.2005.850076 fatcat:57pp7yzwgzef5nfj7x2fqz7wwi

Decoherence of the flux-based superconducting qubit in an integrated circuit environment [article]

Jonathan L. Habif, Mark F. Bocko
2003 arXiv   pre-print
Superconducting, flux-based qubits are promising candidates for the construction of a large scale quantum computer.  ...  We present an explicit quantum mechanical calculation of the coherent behavior of a flux based quantum bit in a noisy experimental environment such as an integrated circuit containing bias and control  ...  RSFQ logic is an integrated circuit family that uses single flux quantum (SFQ) magnetic pulses as data bits.  ... 
arXiv:quant-ph/0304045v1 fatcat:4m5okjcxwvbgboz3y6l3zbk3xu

An HTS quasi-one junction SQUID-based periodic threshold comparator for a 4-bit superconductive flash A/D converter

R.J. Wiegerink, G.J. Gerritsma, E.M.C.M. Reuvekamp, M.A.J. Verhoeven, H. Rogalla
1995 IEEE transactions on applied superconductivity  
The theoretical threshold curve of the comparator is calculated and compared to the measured results.  ...  Furthermore, the thermal noise immunity and the influence of flux-flow are considered, resulting in practical design constraints for the comparator circuit.  ...  For lower ratios the influence of JS on the QOS behavior increases and for a ratio of one we obtain the well-known threshold curve of a two-junction SQUID (the slight asymmetry is caused by the fact that  ... 
doi:10.1109/77.413150 fatcat:ax6rriyuofd6hhhbj77yrjglkq

Superconducting Qubits: Current State of Play [article]

Morten Kjaergaard, Mollie E. Schwartz, Jochen Braumüller, Philip Krantz, Joel I-Jan Wang, Simon Gustavsson, William D. Oliver
2019 arXiv   pre-print
With the recent demonstrations of multiple high fidelity two-qubit gates as well as operations on logical qubits in extensible superconducting qubit systems, this modality also holds promise for the longer-term  ...  using superconducting qubits.  ...  MK gratefully acknowledges support from the Carlsberg Foundation during part of this work.  ... 
arXiv:1905.13641v2 fatcat:dv6go5mfbvdlhcp6vqjrbtzqdq

Superconductive circuits and the general-purpose electronic simulator APLAC

Mikko Kiviranta
2021 IEEE transactions on applied superconductivity  
We review the use of APLAC to model, e.g., noisy dc SQUIDs and transition-edge sensors.  ...  model and capability of modeling the superconductive phase transition with controlled sources.  ...  INTRODUCTION B EHAVIOR of linear superconductive circuits can be assessed with standard analytic techniques of the electronic circuit theory when the second Kirchhoff's law is replaced by the statement  ... 
doi:10.1109/tasc.2021.3068780 fatcat:pxcqjxrp2nditktstblkax7hq4

SFQ data processing with set/reset information

H. Kodaka, T. Hosoki, M. Kitagawa, Y. Okabe
1999 IEEE transactions on applied superconductivity  
By using these two bits of information, a one-to-one correspondence between input and output can be realized.  ...  We propose a new class of SFQ logic circuits. In this new approach, an SFQ pulse represents the transition between "zero" and "one".  ...  ACKNOWLEDGEMENT The authors would like to thank Dr. Shuich Tahara of NEC Corporation and his research group for circuit fabrication. One of the authors (H.K) would like to thank Dr.  ... 
doi:10.1109/77.783838 fatcat:4c2gb5emnzfepkoiuzb63auada

Nonadiabatic Holonomic Quantum Computation with Dressed-State Qubits

Zheng-Yuan Xue, Feng-Lei Gu, Zhuo-Ping Hong, Zi-He Yang, Dan-Wei Zhang, Yong Hu, J. Q. You
2017 Physical Review Applied  
Therefore, we release the main difficulties for physical implementation of holonomic quantum computation on superconducting circuits.  ...  Meanwhile, nontrivial two-qubit gates can be implemented in a coupled-cavities scenario assisted by a grounding SQUID with tunable interaction, where the tuning is achieved by modulating the ac flux threaded  ...  Existing theoretical investigations of two-qubit holonomic gates usually use multilevel systems and result in a slow dispersive gate construction.  ... 
doi:10.1103/physrevapplied.7.054022 fatcat:655uvzflqre3fm6vpjxjr5y55u

Superconducting Qubits: Current State of Play

Morten Kjaergaard, Mollie E. Schwartz, Jochen Braumüller, Philip Krantz, Joel I.-J. Wang, Simon Gustavsson, William D. Oliver
2019 Annual Review of Condensed Matter Physics  
With the recent demonstrations of multiple high-fidelity, two-qubit gates as well as operations on logical qubits in extensible superconducting qubit systems, this modality also holds promise for the longer-term  ...  using superconducting qubits.  ...  M.K. gratefully acknowledges support from the Carlsberg Foundation during part of this work. P.K. acknowledges partial support by the Wallenberg Centre for Quantum Technology LITERATURE CITED  ... 
doi:10.1146/annurev-conmatphys-031119-050605 fatcat:e4slx7dvefb4zmpiigsw3spgla

Superconducting quantum computing: a review

He-Liang Huang, Dachao Wu, Daojin Fan, Xiaobo Zhu
2020 Science China Information Sciences  
Over the last two decades, tremendous advances have been made for constructing large-scale quantum computers.  ...  Section 2 discusses different types of superconducting qubits and the development of the lifetime of qubits in recent years.  ...  [25] demonstrated a two-qubit gate fidelity of up to 99.4% using Xmon qubits, which was the first time that the fidelity of two-qubit gate surpassed the error threshold for the surface code.  ... 
doi:10.1007/s11432-020-2881-9 fatcat:xuxq442kqjhydoan7hga6gwd6m

Superconducting Quantum Computing: A Review [article]

He-Liang Huang, Dachao Wu, Daojin Fan, Xiaobo Zhu
2020 arXiv   pre-print
Over the last two decades, tremendous advances have been made for constructing large-scale quantum computers.  ...  was first achieved using 53 superconducting qubits in 2019.  ...  [32] demonstrated a two-qubit gate fidelity of up to 99.4% using Xmon qubits, which is the first time that the fidelity of two-qubit gate sur- passed the error threshold for the surface code.  ... 
arXiv:2006.10433v3 fatcat:6hijgq2uojfifdn7zdvvlnwunq

Magnetic Josephson Junctions With Superconducting Interlayer for Cryogenic Memory

I. V. Vernik, V. V. Bol'ginov, S. V. Bakurskiy, A. A. Golubov, M. Y. Kupriyanov, V. V. Ryazanov, O. A. Mukhanov
2013 IEEE transactions on applied superconductivity  
We fabricate these type of junctions to reach the device compatibility with conventional SIS junctions used for superconducting SFQ electronics to ensure a seamless integration of MJJ-based circuits and  ...  We found that the properties of SIS'FS junctions fall into two distinct classes based on the thickness of S' layer.  ...  Yohannes for the SIS trilayer wafer preparation, I. Nevirkovets and V. Semenov for useful advice, and M. Manheimer and S. Holmes for attention to this work.  ... 
doi:10.1109/tasc.2012.2233270 fatcat:bd3rrjfrkngvhnuluen3zhxgmu
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