According to Wall Street broker Bernstein, the emergence of quantum computing poses a legitimate yet controllable threat to Bitcoin and the broader cryptocurrency ecosystem. Recent breakthroughs, such as Google Quantum AI's reduction in qubit requirements, indicate that the risk is no longer a distant concern.
However, the firm notes that scaling quantum systems to break widely used encryption remains a complex challenge. Analysts suggest viewing quantum computing as a medium to long-term system upgrade cycle rather than an existential risk.
Quantum computing leverages quantum mechanics, utilizing qubits that can exist in multiple states simultaneously, enabling the processing of numerous possibilities at once. This capability, combined with entanglement, allows quantum systems to solve specific problems more efficiently than classical computers. While quantum computers may eventually weaken cryptographic systems like elliptic curve encryption, the report emphasizes that the threat is manageable and long-term, affecting various industries beyond finance.
The exposure is primarily concentrated in approximately 1.7 million BTC held in older wallets, whereas newer practices and protocols reduce vulnerability. Bernstein expects the crypto industry to have sufficient time, around three to five years, to transition toward post-quantum cryptography, with upgrades like new wallet standards and key rotation already under discussion.