TLDR: A team from Japan has created the largest diamond storage device capable of holding up to 25 exabytes. Although the 2-inch diamond plate is intended to be used as a quantum memory, it can be used even at room temperature. The company that makes it plans to bring it to market next year.

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Japanese researchers, together with a company specializing in industrial jewelry components, have developed a new method for mass production of 2-inch diamond plates. Called Kenzan Diamonds, they can store up to 25 exabytes of data, which is 25 million terabytes, or the equivalent of 1 billion Blu-ray discs.

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Unfortunately, these diamond wafers won’t replace SSDs in our PCs anytime soon, as they act like quantum memory. It uses a defect in diamond called a nitrogen vacancy center to store a quantum bit.

This defect allows researchers to read the specific spin of an electron. This is remarkable in that these diamond qubits can be used even at room temperature, and not only in cryogenic conditions, which are usually required for quantum computers.

Previously, a diamond wafer of required purity for quantum computing applications was limited to an area of ​​just 4mm. Attempting to make larger plates would result in higher levels of nitrogen impurities, rendering them useless.

Researchers from Saga University teamed up with Adamant Namiki Precision Jewel Co. to solve this problem. Using a process called step growth, they grow diamonds on a sapphire substrate coated with an iridium film. They claim that this new method makes diamond production cheaper by minimizing nitrogen uptake, keeping it below three ppb.

The company plans to introduce Kenzan Diamond wafers commercially next year and is already working on 4-inch wafers.