Quantum-randomized polarization of laser pulses derived from zero-point diamond motion
Abstract
Intrinsic randomness in quantum systems is a vital resource for cryptography and other quantum information protocols. To date, randomizing macroscopic polarization states requires randomness from an external source, which is then used to modulate the polarization e.g. for quantum key-distribution protocols. Here, we present a Raman-based device for directly generating laser pulses with quantum-randomized polarizations. We show that crystals of diamond lattice symmetry provide a unique operating point for which the Raman gain is isotropic, so that the spontaneous symmetry breaking initiated by the quantum-random zero-point motion determines the output polarization. Experimentally measured polarizations are demonstrated to be consistent with an independent and identical uniform distribution with an estimated quantum entropy rate of 3.8 bits/pulse.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 05, 2021
- Source ID
- 10.1364/oe.410287
Entities
People
- Akael Alias
- Alexei Gilchrist
- Douglas J Little
- Ondrej Kitzler
- Richard P. Mildren
- Seyed Abedi
Organizations
- Air Force Research Laboratory
- Australian Research Council