Quantum Memory Built With Microscopic Vibrations
“The interaction between the quantum processor and the quantum memory provides a crucial foundation with a view to establishing quantum computers as a powerful and reliable way to perform computations that are not feasible with conventional computers,” Yiwen Chu told Science Daily.
Researchers at ETH Zurich developed a system using microscopic mechanical vibrations to store quantum information, functioning similarly to guitar strings. The findings appeared in the journal Science.
Mechanical Vibrations Store Information in Quantum Memory
Conventional computers separate processing and working memory, using a central processing unit alongside random access memory. Chu’s team adopted this architecture for a quantum system.
A superconducting qubit acts as the processing unit while a separate quantum memory holds calculation data. Information is stored as mechanical vibrations rather than through electromagnetic waves.
“In our quantum working memory, however, information is not stored electromagnetically — as is usually the case today — but rather in the form of mechanical vibrations,” Chu explained.
Advantages Over Electromagnetic Storage
Electromagnetic memory systems take up significant space, complicating the expansion of experimental devices. Microscopic mechanical resonators offer smaller designs and support numerous vibration patterns.
Vibration-based memory preserves quantum states for longer periods than electromagnetic alternatives. Extended storage times help execute complex calculations across multiple processing steps.
Testing The New Vibration Architecture
The research provides the first experimental demonstration that mechanical resonators work alongside superconducting qubits. The team tested the quantum Fourier transform and period-finding algorithms.
“The Quantum Fourier Transform is a fundamental computational procedure required for many quantum algorithms. The period-finding algorithm we implemented served as a demonstration of how this procedure can be used,” said Igor Kladaric, a doctoral student in Chu’s team and co-author of the publication.
Common Questions About Quantum Memory
How does mechanical quantum memory store data?
Information is stored as patterns of microscopic mechanical vibrations rather than through electromagnetic signals. Microscopic structures called mechanical resonators hold these vibration states until the superconducting qubit retrieves them.
What computational tests did the ETH Zurich team perform?
The researchers evaluated the system using the quantum Fourier transform and a period-finding algorithm. These tasks required the device to maintain coherent relationships among multiple quantum states simultaneously.
Keep reading