ABSTRACT
With the recognition of a logical gap between experiments and equations of quantum mechanics comes: (1) a chance to clarify such purely mathematical entities as probabilities, density operators, and partial traces-separated from the choices and judgments necessary to apply them to describing experiments with devices, and (2) an added freedom to invent equations by which
CONTENTS 15.1 Introduction ................................................................................................ 216 15.2 Frequency Spectra of Light in Quantum Key Distribution ................. 217
15.2.1 Simplifying Assumptions............................................................. 218 15.2.2 System Description ........................................................................ 218 15.2.3 Form of Model ................................................................................ 219 15.2.4 Formulating Quantum Optics for Fiber-Optic QKD ................220
