Location History:
- Saint Rémy les Chevreuse, FR (2008)
- Saint Remy les Chevreuse, FR (2011)
Company Filing History:
1 out of 93 
1 out of 5,081 
1 out of 2,559 
Years Active: 2008-2011
Title: The Innovations of Philippe Grangier
Introduction
Philippe Grangier is a notable inventor based in Saint Rémy les Chevreuse, France. He has made significant contributions to the field of quantum cryptography, holding 2 patents that showcase his innovative approach to secure communication.
Latest Patents
Grangier's latest patents include a "Continuous Variable Quantum Encryption Key Distribution System." This invention involves a sender, referred to as Alice, who can randomly choose the phase and amplitude of each coherent light pulse. The system allows for the transmission of signal pulses and a local oscillator to a receiver, Bob, who measures a randomly chosen quadrature of the signal pulse using a homodyne detector. The invention also features a time-division multiplexing device for handling the transmission over optical fiber and a demultiplexer for directing received pulses to different channels.
Another significant patent is the "High-Rate Quantum Key Distribution Scheme Relying on Continuously Phase and Amplitude-Modulated Coherent Light Pulses." This quantum cryptographic scheme includes a sending unit that encodes and distributes a raw key in the quadrature components of quantum coherent states. It also features a receiving unit that performs homodyne detection to measure these states, ensuring secure communication through a quantum channel.
Career Highlights
Throughout his career, Philippe Grangier has worked with prestigious institutions such as Université Libre de Bruxelles and the Centre National de la Recherche Scientifique. His work has significantly advanced the understanding and application of quantum technologies.
Collaborations
Grangier has collaborated with notable individuals in the field, including Nicolas Cerf and Rosa Brouri-Tualle. These partnerships have contributed to the development of innovative solutions in quantum cryptography.
Conclusion
Philippe Grangier's contributions to quantum cryptography through his patents and collaborations highlight his role as a leading inventor in this cutting-edge field. His work continues to influence advancements in secure communication technologies.