Quantum Filtering of Optical Coherent States
arXiv:0704.1918 · doi:10.1103/PhysRevA.78.032315
Abstract
We propose and experimentally demonstrate non-destructive and noiseless removal (filtering) of vacuum states from an arbitrary set of coherent states of continuous variable systems. Errors i.e. vacuum states in the quantum information are diagnosed through a weak measurement, and on that basis, probabilistically filtered out. We consider three different filters based on on/off detection phase stabilized and phase randomized homodyne detection. We find that on/off etection, optimal in the ideal theoretical setting, is superior to the homodyne strategy in a practical setting.
6 pages, 5 figures
References in corpus (4)
- Unconditional optimality of Gaussian attacks against continuous-variable QKD
- Optimality of Gaussian Attacks in Continuous Variable Quantum Cryptography
- Experimental demonstration of continuous variable purification of squeezed states
- Experimental distillation of squeezing from non-Gaussian quantum states