The world’s first as a stable qubit for quantum computers achieved at room temperature
The researchers were able to achieve quantum coherence at room temperature, which is the ability of a quantum system to maintain a well-defined state without being affected by external disturbances. This achievement is an important step forward in the development of quantum computers. It’s easier to work with them if you don’t have to cool them to incredibly low temperatures.
The basic unit of information for quantum computers is the qubit. These tend to be made of just a few molecules entangled in a given state. This means that no matter how much distance you put between them, any interaction with one affects all the particles in the state. This is very useful for the computational side of things, but the entangled state is also very fragile.
In this work, the team achieved an entangled pentagonal state in electrons. They were able to make it using a chromophore – a dye molecule that absorbs light and emits a specific wavelength (or colour), making it ideal for exciting electrons in a specific way to reach the shirt. But this alone is not enough. The chromophore is embedded in a metal-organic framework (MOF), which is a nanoporous crystalline material.
The organic metal frame was chosen to hold plenty of color swatches, while keeping them restricted in their angle of movement. They are able to move enough that when they emit color they excite electrons in the pentagonal state, but movement restrictions prevent vibration that would lead to state collapse.
“This is the first room-temperature quantum coherence of entangled pentagons,” co-author Professor Yasuhiro Kobori of Kobe University said in a statement.
The team was able to use microwave light to check the state of the system, showing that it remained in quantum coherence for more than 100 nanoseconds. This is a tiny fraction of a second, but it shows that quantum coherence can be achieved at room temperature.
“It will be possible to generate qubits with a multi-exciton five-state more efficiently in the future by searching for guest molecules that can induce more of these suppressed motions and by developing suitable MOF structures,” speculates lead author Associate Professor Nobuhiro Yanai from Kyushu University. “This could open the doors to room-temperature molecular quantum computing based on multiple quantum gate control and quantum sensing of various target compounds.”
Quantum sensing is a particularly exciting application. Using the extremely sensitive nature of quantum entanglement (which is often the problem), researchers believe they can develop sensing technologies with higher resolutions and sensitivities compared to those currently used.
The study was published in the journal Science Advances.