Quantum cryptography is a subfield of cryptography that uses principles of quantum mechanics to secure communication. Quantum cryptography can provide provably secure communication channels, even against an eavesdropper with unlimited computational power. Quantum key distribution is one of the most well-known applications of quantum cryptography. Popular quantum cryptography platforms include ID Quantique, Toshiba, and QuintessenceLabs. Check our reviews Blockchain is a distributed ledger technology that allows for secure, transparent, and tamper-proof transactions. Blockchain is used in many applications, such as cryptocurrency, supply chain management, and identity verification. Popular blockchain platforms include Ethereum, Bitcoin, and Hyperledger Fabric.