Presentation Information
[ED1-03-INV]Wideband and Compact Josephson Parametric Amplifier for Quantum Computing Applications
*Yoshiro Urade1 (1. AIST (Japan))
Keywords:
Quantum computer,Josephson parametric amplifier,Superconducting qubit
Josephson parametric amplifiers (JPAs) are superconducting microwave devices widely used for fast and high-fidelity readout of superconducting qubits. Their key property is the ultralow noise performance approaching the quantum limit. Recent advancements in superconducting quantum computing systems have necessitated wideband operation of JPAs for frequency-multiplexed readout of multiple qubits to reduce the number of wiring lines required inside dilution refrigerators. To this end, various kinds of JPAs have been developed, including impedance-matched JPAs (IMPAs) and travelling-wave JPAs (JTWPAs).
While most JPAs are currently realized as discrete and bulky microwave components, it is evident that monolithic integration of compact JPAs will be required as the number of qubits scales toward ~106, the estimated number of qubits for practical quantum computing with quantum error correction.
To address this challenge, we propose a miniaturized IMPA design using solely lumped-element circuits. We replace distributed elements used in previous studies with lumped elements such as spiral inductors and parallel-plate capacitors, fabricated from a thin-film Nb/Al-anodized AlOx/Nb stack. The Josephson junctions, based on Nb/Al-AlOx/Nb, are fabricated using the process developed at AIST. By adopting lumped elements, we have realized a lumped-element IMPA with a footprint reduced to 1/50 of the conventional implementation.
In this presentation, we will discuss the circuit design principles and report on the amplification characteristics of the lumped-element IMPA at 10 mK.
While most JPAs are currently realized as discrete and bulky microwave components, it is evident that monolithic integration of compact JPAs will be required as the number of qubits scales toward ~106, the estimated number of qubits for practical quantum computing with quantum error correction.
To address this challenge, we propose a miniaturized IMPA design using solely lumped-element circuits. We replace distributed elements used in previous studies with lumped elements such as spiral inductors and parallel-plate capacitors, fabricated from a thin-film Nb/Al-anodized AlOx/Nb stack. The Josephson junctions, based on Nb/Al-AlOx/Nb, are fabricated using the process developed at AIST. By adopting lumped elements, we have realized a lumped-element IMPA with a footprint reduced to 1/50 of the conventional implementation.
In this presentation, we will discuss the circuit design principles and report on the amplification characteristics of the lumped-element IMPA at 10 mK.