Dual-Multiplexer Qubit Readout Filtration for Cryogenic Noise Reduction
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Solution Overview
Problem
Existing techniques fail to adequately attenuate qubit readout signals without affecting qubit control signals, leading to excessive thermal noise, room temperature amplification, and signal ripples.
Innovation Solution
A dual-multiplexer circuit is employed, comprising a first and second multiplexer with frequency filters and attenuators, to selectively attenuate qubit readout signals while preserving qubit control signals, located within a cryogenic environment to minimize thermal noise and signal ripples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If existing techniques are used to attenuate qubit readout signals, then signal attenuation is achieved, but excessive thermal noise is generated
Solution Approach 1:
The patent divides the signal path into separate channels using a dual-multiplexer circuit. The readout signal and control signal are routed through different paths, with the readout signal passing through attenuators while the control signal bypasses them. This segmentation allows selective attenuation of only the readout signal without affecting the control signal, thereby reducing thermal noise generation while achieving necessary signal attenuation.
Solution Approach 2:
The patent applies attenuation components (attenuators) locally only to the readout signal path, not uniformly to all signals. By placing attenuators specifically in the readout signal channel within the cryogenic environment, the system achieves local signal attenuation where needed while maintaining high-quality, non-attenuated control signals, thus minimizing thermal noise in critical paths.
2Loss of energy
If existing techniques are used to attenuate qubit readout signals, then signal attenuation is achieved, but excessive room temperature amplification is required
Solution Approach 1:
The dual-multiplexer circuit segments the signal processing functions, placing attenuators in the cryogenic environment to attenuate readout signals before they require amplification. This eliminates the need for excessive room temperature amplification by performing attenuation at the source in the cold environment, where thermal noise is already minimized.
Solution Approach 2:
The patent introduces a dual-multiplexer circuit as an intermediary component that mediates between the signal source and the amplification stage. This intermediary performs frequency splitting and selective attenuation in the cryogenic environment, allowing signals to be conditioned before amplification and thereby reducing the amplification power needed at room temperature.
3Loss of energy
If existing techniques are used to attenuate qubit readout signals, then signal attenuation is achieved, but excessive signal ripples are introduced
Solution Approach 1:
The patent applies attenuation locally and selectively only to the readout signal path using precisely controlled attenuators within the dual-multiplexer circuit. This localized approach avoids the introduction of excessive signal ripples by ensuring that attenuation is applied uniformly and controllably only where necessary, rather than through broad-spectrum filtering that would affect signal stability.
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 dual-multiplexer circuit effectively attenuates qubit readout signals without impacting qubit control signals, maintaining qubit performance and reducing thermal noise and signal ripples, thus enhancing qubit operation efficiency.
Implementation Method 1
The first multiplexer can be configured to frequency-split the input signal into the at least one qubit readout signal and the at least one qubit control signal
Implementation Method 2
the at least one first wire can be configured to pass the at least one qubit readout signal through the one or more attenuators thereby yielding at least one attenuated qubit readout signal
Implementation Method 3
the second multiplexer can be configured to frequency-combine the at least one qubit control signal with the at least one attenuated qubit readout signal
Data Source
AI summary
Systems and techniques that facilitate dual-multiplexer filtration of inputted qubit readout signals are provided. In various embodiments, a device can comprise a cable that can transmit an input signal to a qubit. In various aspects, the input signal can include at least one qubit readout signal and at least one qubit control signal. In various instances, the device can further comprise a dual-multiplexer circuit located along the cable. In various cases, the dual-multiplexer circuit can selectively attenuate the at least one qubit readout signal.