For now, the flagship cryptocurrency is perfectly safe. Existing devices are far from achieving the size required to hack Bitcoin. Quantum computers use qubits instead of bits, which allows them to process infinitely more data compared to ordinary computers. unveiled a 127-qubit quantum computing chip, breaking the 100-qubit barrier for the first time.
Webber and his colleague estimate that a quantum computer would need to have at least 13 million qubits in order to break Bitcoin’s encryption in a day. Notably, the researchers believe that 300 million qubits would be “achievable” for quantum computers in the future, which will pose a threat to the largest cryptocurrency.
Our estimated requirement of 30 [million] to 300 million physical qubits suggests Bitcoin should be considered safe from a quantum attack for now, but devices of this size are generally considered achievable, and future advancements may bring the requirements down further.
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