Secret Sharing of a Quantum State.

Area of Science:

• Quantum Information Science
• Quantum Cryptography

Background:

• Quantum secret sharing is crucial for secure quantum communication.
• Threshold schemes require a minimum number of participants to access information.
• Sharing entangled and unknown quantum states is a key challenge.

Purpose of the Study:

• To demonstrate a practical quantum threshold secret sharing scheme.
• To ensure confidentiality and efficient reconstruction of quantum information.
• To validate the sharing of entangled quantum states.

Main Methods:

• Utilized a six-photon entangled state.
• Implemented a quantum threshold scheme.
• Experimentally verified information recovery and confidentiality.

Main Results:

• Achieved high state fidelity (93%) in reconstructing shared quantum secrecy.
• Demonstrated that fewer than the threshold number of parties cannot recover the secret.
• Successfully shared and recovered entangled quantum information.

Conclusions:

• The implemented scheme meets confidentiality criteria for quantum secret sharing.
• The scheme is fully quantum, capable of sharing entangled states.
• The experimental setup functions as a decoding circuit for a five-qubit quantum error-correcting code.