Modulated RF Signal Generation with Phase-Locked Multitone Sources
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Solution Overview
Problem
Current systems for controlling or reading-out multiple-state systems, such as quantum computing architectures or multiple-input multiple-output (MIMO) architectures, require a high number of local oscillator sources, leading to increased costs, complexity, and reduced phase stability between radio frequency channels.
Innovation Solution
A modulated RF signals generating system that includes a baseband signal generator, a reference frequency source, a multitone source, and mixers, where the multitone source locks the phase between the baseband signal generator and itself, significantly reducing the number of required local oscillator sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a high number of local oscillator sources are used to generate modulated RF signals for each qubit, then the control precision of qubit states is improved, but the device complexity and cost increase significantly
Solution Approach 1:
The patent combines multiple local oscillator sources into a single shared local oscillator that serves all qubits. The baseband signal generator produces individual control signals for each qubit, which are then combined with the shared local oscillator signal in mixers to generate the required modulated RF signals for multiple qubits simultaneously, thereby reducing the total number of local oscillator sources from N (for N qubits) to just one.
Solution Approach 2:
The shared local oscillator is designed to serve multiple functions by providing the carrier signal for modulating control pulses for all qubits. The baseband signal generator performs multiple functions by generating individual control signals for each qubit while using the same local oscillator reference, making the system more universal and less complex.
2Stability of the object's composition
If individual local oscillator sources are assigned to each RF signal generator, then the phase stability between channels is improved, but the device complexity and space requirements increase
Solution Approach 1:
The patent merges all local oscillator functions into a single shared source that provides the carrier signal for all qubit control channels. This single local oscillator is phase-stable by design and serves all mixers simultaneously, eliminating the need for multiple separate local oscillator sources while maintaining phase stability across all RF channels through the common reference.
3Adaptability or versatility
If multiple local oscillator sources are used in a cryostat arrangement, then the control of multiple qubits is enabled, but the space consumption and power requirements increase
Solution Approach 1:
The patent merges the functions of multiple local oscillator sources into a single shared local oscillator unit that can be positioned outside the cryostat or at a more convenient location. The baseband signal generator and mixers are arranged to receive signals from this single local oscillator through minimal cabling, thereby dramatically reducing the space requirements within the cryostat environment while maintaining the ability to control multiple qubits.
4Adaptability or versatility
If a high number of local oscillator sources are deployed, then the coverage of frequency channels is improved, but the power consumption increases
Solution Approach 1:
The patent combines the power-consuming local oscillator functions into a single shared source that generates the carrier signal for all frequency channels. The baseband signal generator produces low-power individual control signals for each qubit frequency channel, which are then modulated onto the shared local oscillator signal in mixers. This approach reduces total power consumption from N local oscillators to just one, while the frequency channel coverage is maintained through the versatility of the baseband signal generator and mixer architecture.
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 reduces the number of local oscillator sources, saving costs and increasing phase stability between radio frequency channels, while also minimizing space and power consumption.
Implementation Method 1
at least one mixer comprising a first mixer input, at least one second mixer input and a mixer output. In this context, the corresponding one of the at least one baseband signal generator output is connected to the first mixer input of the respective one of the at least one mixer. In addition to this, the corresponding one of the at least one multitone source output, especially the multitone source output, is connected to the second mixer input of the respective one of the at least one mixer
Data Source
AI summary
A modulated RF signals generating system for controlling or reading-out a multiple-state system, such as a quantum computing architecture or a multiple-input multiple-output architecture, is provided. The system includes a baseband signal generator having a baseband signal generator output(s), a reference frequency source being in unidirectional or bidirectional communication with the baseband signal generator, a multitone source including multitone source output(s) and being in unidirectional or bidirectional communication with the reference frequency source to lock the corresponding phase between the baseband signal generator and the multitone source, and mixer(s) including a first mixer input, a second mixer input(s) and a mixer output. The corresponding one of the baseband signal generator output(s) is connected to the first mixer input of the respective one of the mixer(s). The corresponding one of the multitone source output(s) is connected to the second mixer input of the respective one of the mixer(s).