Experimental Extraction of Secure Correlations from a Noisy Private State

Abstract

We report experimental generation of a noisy entangled four-photon state that exhibits a separation between the secure key contents and distillable entanglement, a hallmark feature of the recently established quantum theory of private states. The privacy analysis, based on the full tomographic reconstruction of the prepared state, is utilized in a proof-of-principle key generation. The inferiority of distillation-based strategies to extract the key is exposed by an implementation of an entanglement distillation protocol for the produced state.

5 pages, 3 figures, final version

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• Practical, Reliable Error Bars in Quantum Tomography
• Limitations on Quantum Key Repeaters
• Distillability and PPT entanglement of low-rank quantum states
• Complementarity Reveals Bound Entanglement of Two Twisted Photons
• Complete elimination of information leakage in continuous-variable quantum communication channels
• Bound entangled states with a private key and their classical counterpart
• Quantum information
• Quantum mechanical which-way experiment with an internal degree of freedom
• Bound entangled states fit for robust experimental verification
• Private states, quantum data hiding and the swapping of perfect secrecy
• Disorder and dephasing as control knobs for light transport in optical fiber cavity networks
• Quantum privacy witness
• Experimental generation of complex noisy photonic entanglement
• Hybrid quantum network design against unauthorized secret-key generation, and its memory cost
• Noise as a resource
• Gaussian intrinsic entanglement for states with partial minimum uncertainty
• Construction and properties of a class of private states in arbitrary dimensions