Journal
PHYSICAL REVIEW A
Volume 78, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.78.032315
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Funding
- EU project COVAQIAL [FP6-511004]
- EU-IST network SECOQC, COMPAS [212008, 202/07/J040]
- GACR [MSM6198959213]
- Czech Ministry of Education
- Alexander von Humboldt Foundation
- European Social Fund
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We propose and experimentally demonstrate nondestructive 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 detection, optimal in the ideal theoretical setting, is superior to the homodyne strategy also in a practical setting.
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