Superconducting Qubit Interconnects for Low-Noise State Transfer
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Solution Overview
Problem
Operations on qubits introduce errors due to decoherence and quantum noise, affecting coherence times and scalability of quantum systems, particularly due to fluctuations in energy relaxation times and external interference.
Innovation Solution
A system comprising a quantum device, a microwave optical transducer, and a coherent interconnect, where the transducer is separately packaged from the quantum device, using a superconducting coaxial cable with a flux-tunable DC-SQUID for bi-directional quantum state transfer, allowing for frequency tuning and increased distances without external interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantum devices are packaged together in close proximity, then interaction and communication between devices is facilitated, but external interference and quantum noise increase leading to decoherence and reduced coherence times
Solution Approach 1:
The patent divides the quantum system into separate modules - quantum devices are packaged independently from microwave-optical transducers. This segmentation allows quantum devices to be isolated in low-noise environments while transducers handle signal conversion, reducing external interference and maintaining coherence times without compromising device interaction capability
Solution Approach 2:
The patent introduces microwave-optical transducers as intermediary components that bridge quantum devices separated by longer interconnects. These transducers convert microwave signals to optical signals for transmission over longer distances, enabling device separation that reduces external interference while maintaining communication through the intermediary transduction process
2Adaptability or versatility
If the interconnect distance between quantum devices is increased, then scalability and system complexity are improved, but signal loss and interference from outside sources increase
Solution Approach 1:
Microwave-optical transducers serve as mediators that enable signal transmission over longer interconnect distances. By converting microwave signals to optical signals suitable for long-distance transmission and back again, the system achieves scalability with maintained signal integrity, as the optical domain is less susceptible to interference over extended interconnects
Solution Approach 2:
The patent changes the signal transmission parameter from microwave frequency to optical frequency for long-distance interconnects. This parameter change allows signals to traverse longer distances with reduced loss and interference, enabling scalable quantum systems while maintaining reliability through frequency domain transformation
3Adaptability or versatility
If flux-tunable elements are added to enable frequency tuning, then adaptability and resonance matching are improved, but device complexity increases
Solution Approach 1:
The patent incorporates flux-tunable elements that dynamically adjust resonance frequencies of interconnects and transducers. This dynamic tuning capability allows the system to adapt to different operating conditions and maintain resonance matching despite frequency drift or variations, providing adaptability through controlled dynamic adjustment rather than static fixed-frequency design
4Ease of manufacture
If separately packaged transducers are used, then scalability and modular assembly are improved, but interconnect length and potential interference pathways increase
Solution Approach 1:
The separately packaged transducers act as intermediary nodes that enable modular assembly while managing interconnect lengths. By positioning transducers at strategic points and using optical signal transmission, the system achieves modular scalability without proportionally increasing interference exposure, as optical signals are less susceptible to interference over the extended interconnect paths required for modular configurations
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
This solution enhances qubit performance by reducing external interference, increasing scalability, and enabling more complex quantum computations by maintaining coherence times and facilitating longer interconnects between quantum devices.
Implementation Method 1
The cable can include a flux-tunable DC-SQUID to facilitate frequency tuning of mode frequencies of the device
Implementation Method 2
The microwave optical transducer can enable bi-directional transfer of a quantum state between the quantum device and the microwave resonator
Implementation Method 3
The coherent interconnect can be a superconducting coaxial cable
Data Source
AI summary
Systems and techniques that facilitate enabling transfer of a quantum state between a quantum device and a microwave resonator of a microwave optical transducer. In various embodiments, a system can comprise a quantum device, a microwave optical transducer including a microwave resonator, and a coherent interconnect. In various embodiments, the coherent interconnect can be between the quantum device and the microwave optical transducer that can enable bi-directional transfer of a quantum state between the quantum device and the microwave resonator. In various embodiments, the microwave optical transducer can be separately packaged from the quantum device. With various embodiments, the coherent interconnect can be a superconducting coaxial cable.