Nondegenerate Quantum Amplifier for Dense Qubit Readout
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Solution Overview
Problem
The frequency-multiplexed readout systems in quantum computing face constraints due to minimum frequency spacing requirements between readout resonators to minimize crosstalk, limiting the maximum number of qubit readout signals that can be carried by a pair of input and output lines within a given bandwidth.
Innovation Solution
Implementing nondegenerate through quantum-limited amplifiers that allow frequency-multiplexing of quantum signals with non-overlapping frequency bands, enabling increased spectral density of amplified signals and facilitating entanglement operations between remote quantum bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If frequency-multiplexed readout systems use multiple readout resonators with different resonance frequencies coupled to a single communication bus, then the number of qubit readout signals per readout chain is increased, but the minimum frequency spacing required between resonators to reduce crosstalk limits the maximum number of readout signals that can be carried within a given bandwidth
Solution Approach 1:
The patent applies parametric amplification by modulating the resonant frequency of the readout resonator using a pump signal. This frequency modulation creates time-varying coupling between the resonator and communication bus, enabling signal amplification and frequency conversion. The parameter changes in resonator frequency allow multiple signals to be processed through a single bus while maintaining signal integrity and reducing crosstalk effects
Solution Approach 2:
The patent introduces a parametric amplifier as an intermediary device between the readout resonators and the communication bus. This intermediary component performs frequency conversion and signal amplification, allowing multiple resonators to share a single communication bus without direct frequency interference. The parametric amplifier acts as a mediator that converts signals from different frequency bands into a common output band, thereby increasing the effective number of readable qubits per chain
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 solution enhances the spectral density of amplified qubit readout signals per output line, overcoming the crosstalk constraints and enabling efficient entanglement operations in quantum computing systems.
Implementation Method 1
a first input port coupled to a first readout resonator and a second input port coupled to a second readout resonator, wherein the nondegenerate three-wave mixing device is configured to amplify a first quantum signal from the first readout resonator and amplify a second quantum signal from the second readout resonator
Implementation Method 2
a nondegenerate three-wave mixing device comprising a first input port coupled to a first readout resonator and a second input port coupled to a second readout resonator, wherein the nondegenerate three-wave mixing device is configured to amplify a first quantum signal from the first readout resonator and amplify a second quantum signal from the second readout resonator
Data Source
AI summary
A device comprises a nondegenerate through quantum-limited amplifier comprising a first port, a second port, and a third port. The first port is configured to receive first quantum signals which comprise frequencies within a first frequency band. The second port is configured to receive second quantum signals which comprise frequencies within a second frequency band, which is non-overlapping with the first frequency band. The nondegenerate through quantum-limited amplifier is configured to amplify the first quantum signals, amplify and convert the frequencies of the second quantum signals to frequencies within the first frequency band, and output the amplified first quantum signals and the amplified frequency-converted second quantum signals from the third port.