Multimode Josephson Parametric Converter for Quantum-Limited Amplification
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Solution Overview
Problem
Current quantum information processing in the microwave domain lacks amplifiers and frequency converters with quantum-limited performance, particularly phase-preserving amplifiers that can effectively amplify both quadratures of the microwave field without adding noise, which is essential for various quantum applications including qubit readout.
Innovation Solution
A multimode Josephson parametric converter is developed, utilizing a Josephson ring modulator coupled with multimode resonators made of left-handed transmission lines, enabling amplification and frequency conversion at the quantum limit by leveraging the high density of resonance modes within the microwave band of interest.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a phase-preserving amplifier is used to amplify both quadratures of the microwave field, then the signal amplification is improved, but noise is added equivalent to at least a half input photon
Solution Approach 1:
The amplifier is segmented into multiple independent resonant modes (fundamental mode and higher-order modes) that operate simultaneously. Each mode processes a specific frequency component, allowing the system to distribute the amplification function across multiple channels. This segmentation enables quantum-limited performance by separating the signal processing into distinct mode channels that can be optimized independently.
Solution Approach 2:
The amplifier structure is designed to perform multiple functions simultaneously: it provides phase-preserving amplification across a broad frequency bandwidth by supporting multiple resonant modes. The same physical structure handles both the fundamental mode amplification and higher-order mode amplification, making the device universally applicable for broadband quantum signal processing without requiring separate amplifier stages.
2Power
If a Josephson ring modulator is used for frequency conversion, then the conversion efficiency is improved, but the device is limited to single-mode operation
Solution Approach 1:
The frequency conversion function is segmented across multiple resonant modes of the transmission line. Instead of a single conversion channel, the system creates multiple parallel conversion pathways corresponding to different resonant frequencies. This allows the Josephson ring modulator to simultaneously perform frequency conversion on multiple signal modes, greatly enhancing adaptability for multi-frequency quantum applications.
Solution Approach 2:
The system transitions from single-mode operation to multimode operation by utilizing the spatial dimension of the transmission line. Higher-order resonant modes correspond to different spatial distribution patterns of the electromagnetic field along the transmission line. By exploiting this spatial dimension, the device achieves multi-functionality while maintaining the compact Josephson ring modulator structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The multimode Josephson parametric converter achieves quantum-limited amplification and frequency conversion, enhancing the capability for quantum information processing beyond standard devices by utilizing multiple resonance modes within the 5-15 GHz band, suitable for applications like remote entanglement and amplification of multiple microwave signals.
Implementation Method 1
Josephson ring modulator, which consists of four Josephson junctions in a Wheatstone bridge configuration
Implementation Method 2
multimode resonators made of left-handed transmission lines, enabling amplification and frequency conversion at the quantum limit by leveraging the high density of resonance modes within the microwave band of interest
Data Source
AI summary
A technique relates to a microwave device. The microwave device includes a Josephson ring modulator, a first multimode resonator connected to the Josephson ring modulator, where the first multimode resonator is made of a first left-handed transmission line, and a second multimode resonator connected to the Josephson ring modulator, where the second multimode resonator is made of a second left-handed transmission line.