#### Room 117

#### Thermal entangled quantum heat engine

#### Sahil

##### IMSc

*Based on a two-qubit Heisenberg XY model, we construct a *

four-level entangled quantum heat engine (QHE). It is an interesting

quantum Otto cycle where the exchange constant is fixed and only the

magnetic field is varied during the adiabatic steps. The expressions

for several thermodynamic quantities such as the heat transferred, the

work and the efficiency are derived. Moreover,the influence of the

entanglement on the thermodynamic quantities is investigated

numerically. Several interesting features of the variation of the heat

transferred, the work and the efficiency with the concurrences of the

thermal entanglement of different thermal equilibrium states are

obtained. Finally, we discussed the maximum efficiency of the QHE.

Link to the paper:

reader.elsevier.com/reader/sd/pii/S0378437112007194?token=38F3251CA874BBBB2C2626133AC6602083E93085FF9B1C6AFA2A9AFA7D562F4A0E45179E7EC051772C6C861303EA910A

Done