What are the current limitations and challenges in quantum computing development?

Quantum computing faces several major hurdles before becoming practical. Current quantum computers have limited 'qubits' (quantum bits) and suffer from high error rates, making calculations unreliable. They require extreme cooling near absolute zero, creating expensive infrastructure challenges. Most quantum computers can only maintain their quantum state for milliseconds before 'decoherence' occurs, losing information. Additionally, developing quantum algorithms that outperform classical computers for real-world problems remains difficult. For cryptocurrency, quantum computers theoretically threaten current encryption methods, but we're likely 10+ years away from machines powerful enough to break Bitcoin's security. The crypto industry is preparing by researching post-quantum cryptography standards.