Thwarting the Photon Number Splitting Attack with Entanglement Enhanced   BB84 Quantum Key Distribution
  We develop an improvement to the weak laser pulse BB84 scheme for quantum key distribution, which utilizes entanglement to improve the security of the scheme and enhance its resilience to the photon-number-splitting attack. This protocol relies on the non-commutation of photon phase and number to detect an eavesdropper performing quantum non-demolition measurement on number. The potential advantages and disadvantages of this scheme are compared to the coherent decoy state protocol. 
Carl F. Sabottke, Chris D. Richardson, Petr M. Anisimov, Ulvi   Yurtsever, Antia Lamas-Linares, Jonathan P. Dowling
quant-ph physics.optics