Exact rate analysis for quantum repeaters with imperfect memories and entanglement swapping as soon as possible

Exact rate analysis for quantum repeaters with imperfect memories and entanglement swapping as soon as possible We present an exact rate analysis for a secret key that can be shared among two parties employing a linear quantum repeater chain. One of our main motivations is to address the question whether simply placing quantum memories along a quantum communication channel can be beneficial in a realistic setting. The underlying model assumes deterministic entanglement swapping of single-spin q...