Realization of finite size quantum key distribution based on Einstein Podolsky Rosen entangled light Quantum key distribution continuous variables Einstein Podolsky Rosen entanglement two mode squeezed states coherent attacks collective attacks. Quantenschlüsselverteilung kontinuierliche Variablen Einstein Podolsky Rosen Verschränkung zwei moden gequetschte Zustände kohärente Attacken kollektive Attacken