Security of decoy-state quantum key distribution with inexactly   controlled source
  We show the unconditional security of decoy-state method quantum cryptography with whatever intensity error pattern provided that the error is not too large. Our result immediately applies to the existing experimental data. Our result is not limitted to coherent states. 
Xiang-Bin Wang, Cheng-Zhi Peng, Jun Zhang, Jian-Wei Pan