Scientists at ETH Zürich have created the world’s first fully functional mechanical qubit. This breakthrough, published in Science, offers a new approach to building qubits and shows its potential through successful tests. Quantum computers are predicted to tackle complex problems that classical computers cannot solve.
However, a major challenge has been the short-lived coherence times of virtual qubits, usually made using electromagnetics. These qubits are unstable and prone to errors. The ETH Zürich team has found a solution: mechanical qubits.
Unlike traditional bits that represent data as ones or zeros, qubits can represent data in both states simultaneously. The team’s mechanical qubit is made using a piezoelectric disk attached to a sapphire base, which acts as a mechanical resonator.
A superconducting qubit made of a superconducting material is also attached to its own sapphire base. The mechanical qubit can hold information in multiple states: steady, vibrating, or a mix of both.
The first functional mechanical qubit created
This mechanical qubit’s ability to stay coherent for longer periods than virtual qubits is a big advantage. On average, the coherence times seen with this mechanical qubit were better than those of hybrid or virtual qubits used today. The team plans to improve coherence times even more using different materials.
They also want to test their qubits with quantum gates to see how well they perform in more complex quantum computing tasks. The study’s lead author, Yu Yang, said: “This hybrid approach allows us to manipulate the mechanical qubit with improved coherence times and control.”
While the current record for superconducting qubit coherence time is about one millisecond, typical times are around 100 microseconds. The prototype mechanical qubit developed by the ETH Zurich team has a coherence time of about 200 microseconds.
This is already a big improvement. The team believes their mechanical qubit could help scientists develop better quantum technologies and sensing applications in the future. Yang noted: “Our system enables measurement of gigahertz-frequency mechanical forces, offering new avenues for quantum sensing applications.
The development of the first mechanical qubit is a step forward in quantum technology.
It promises more robust and longer-lasting qubits for future quantum computers. However, more work is needed to further optimize the device and extend its coherence time to match or exceed state-of-the-art electromagnetic qubits.
April Isaacs is a news contributor for DevX.com She is long-term, self-proclaimed nerd. She loves all things tech and computers and still has her first Dreamcast system. It is lovingly named Joni, after Joni Mitchell.
