QbitShield is a quantum cryptography company focused on quantum key distribution (QKD) using a proprietary framework called Prime Harmonic Modulation (PHM). The company has developed Prime-Basis QKD (PB-QKD), a protocol that replaces the standard Hadamard basis with prime-indexed phase rotations for quantum state preparation. Core technology: - Prime Harmonic Modulation (PHM): A state preparation method where each qubit is prepared using a prime-indexed phase rotation, expressed as |ψ_p⟩ = (1/√2)(|0⟩ + e^(iπ/p)|1⟩) - PB-QKD supports configurable multi-basis operation beyond standard BB84, with error correction and privacy amplification - A live API is available for generating prime-basis QKD keys, with encrypted object storage, HSM integration, audit logging, and key provenance controls Validation and hardware: - Circuits have been validated on IBM Quantum (ibm_fez Heron QPU) and IonQ hardware via Amazon Braket - Hardware results report 6.3x better mutual information and 12.7x better effective channel information vs. baseline - Key material undergoes real-time statistical testing against NIST SP 800-22 randomness standards Intellectual property: - Non-provisional patent application NPA-N417 filed July 26, 2025, covering PB-QKD and PHM methods - Research origin dates to 2017 Target markets include banking, healthcare, and government laboratories. The platform is noted as being for evaluation and development only, with planned certifications including NIST SP 800-90B and FIPS 140-3. Post-quantum cryptography standards ML-KEM and ML-DSA are also referenced on the roadmap.