The concept of "QFS" or Quantum Financial System is not well-defined.

Computational Power: Quantum computers have the potential to perform certain types of calculations much faster than classical computers. This could potentially lead to faster transaction processing times and enhanced scalability for blockchain networks.

Security: Quantum computing could theoretically break some of the cryptographic algorithms that are currently used in blockchain technology (such as RSA and ECDSA). Quantum-resistant cryptographic algorithms are being researched to address this potential vulnerability.

Data Privacy: Quantum computing could enable more sophisticated methods for data privacy and confidentiality in blockchain transactions, potentially enhancing user privacy.

Consensus Mechanisms: Quantum computing might allow for more efficient and secure consensus mechanisms, leading to improved network reliability and reduced energy consumption compared to current proof-of-work or proof-of-stake algorithms.