Continuous Variable Quantum State Sharing via Quantum Disentanglement

Abstract

Quantum state sharing is a protocol where perfect reconstruction of quantum states is achieved with incomplete or partial information in a multi-partite quantum networks. Quantum state sharing allows for secure communication in a quantum network where partial information is lost or acquired by malicious parties. This protocol utilizes entanglement for the secret state distribution, and a class of "quantum disentangling" protocols for the state reconstruction. We demonstrate a quantum state sharing protocol in which a tripartite entangled state is used to encode and distribute a secret state to three players. Any two of these players can collaborate to reconstruct the secret state, whilst individual players obtain no information. We investigate a number of quantum disentangling processes and experimentally demonstrate quantum state reconstruction using two of these protocols. We experimentally measure a fidelity, averaged over all reconstruction permutations, of F = 0.73. A result achievable only by using quantum resources.

Published, Phys. Rev. A 71, 033814 (2005) (7 figures, 11 pages)

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• Experimental demonstration of graph-state quantum secret sharing
• Circular quantum secret sharing
• Secret sharing of a quantum state
• Hierarchical quantum information splitting
• Operational resource theory of continuous-variable nonclassicality
• Three-party qutrit-state sharing
• Multiparty quantum secret splitting and quantum state sharing
• Experimentally feasible quantum erasure-correcting code for continuous variables
• Minimal classical communication and measurement complexity for quantum information splitting
• Scheme for implementing quantum information sharing via tripartite entangled state in cavity QED
• Quantum Teamwork for Unconditional Multiparty Communication with Gaussian States
• Improving the security of multiparty quantum secret splitting and quantum state sharing
• Continuous Variable Quantum Key Distribution with a Noisy Laser
• Spacetime replication of continuous variable quantum information
• Generation of picosecond pulsed coherent state superpositions
• Generation and structuring of multipartite entanglement in Josephson parametric system
• Measurement-device-independent quantum-secret-sharing networks with linear Bell-state analysis
• Quantum steering as a resource for secure tripartite Quantum State Sharing
• Continuous-variable ramp quantum secret sharing with Gaussian states and operations
• Verifying the security of a continuous variable quantum communication protocol via quantum metrology
• Gaussian multipartite quantum discord from classical mutual information
• Protecting Classical-Quantum Signals in Free Space Optical Channels
• A Three-Mode Erasure Code for Continuous Variable Quantum Communications