>The current estimates of the number of qubits in a universal quantum computer needed to break RSA 2048 (asymmetric cryptography) and AES 256 (symmetric cryptography) are 4,098 and 6,681, respectively.<p>The article had previously claimed that AES 256 was immune to quantum attacks. Then the article lists the number of Q-bits achieved by various companies. This is super misleading. The 4098 Q-bit requirement for RSA2048 is in <i>logical</i> Q bits. The list of achievements is in <i>physical</i> Q-bits. Up to now, no one has been able to achieve even a single logical Q-bit.