Quantum Painlev\'e Equations: from Continuous to Discrete
  We examine quantum extensions of the continuous Painlev\'e equations, expressed as systems of first-order differential equations for non-commuting objects. We focus on the Painlev\'e equations II, IV and V. From their auto-B\"acklund transformations we derive the contiguity relations which we interpret as the quantum analogues of the discrete Painlev\'e equations. 
Hajime Nagoya, Basil Grammaticos and Alfred Ramani