Maxwell's demons in multipartite quantum correlated systems
arXiv:1407.6768 · doi:10.1103/PhysRevA.90.042338
Abstract
We investigate the extraction of thermodynamic work by a Maxwell's demon in a multipartite quantum correlated system. We begin by adopting the standard model of a Maxwell's demon as a Turing machine, either in a classical or quantum setup depending on its ability of implementing classical or quantum conditional dynamics, respectively. Then, for an n-partite system (A_1, A_2, ..., A_n), we introduce a protocol of work extraction that bounds the advantage of the quantum demon over its classical counterpart through the amount of multipartite quantum correlation present in the system, as measured by a thermal version of the global quantum discord. This result is illustrated for an arbitrary n-partite pure state of qubits with Schmidt decomposition, where it is shown that the thermal global quantum discord exactly quantifies the quantum advantage. Moreover, we also consider the work extraction via mixed multipartite states, where examples of tight upper bounds can be obtained.
8 pages, 3 figures. v2: Minor corrections. Published version
References in corpus (10)
- Quantum discord and the power of one qubit
- On the quantum, classical and total amount of correlations in a quantum state
- Classical and quantum correlations under decoherence
- No-local-broadcasting theorem for quantum correlations
- Operational Significance of Discord Consumption: Theory and Experiment
- Quantum discord and local demons
- Experimentally Witnessing the Quantumness of Correlations
- Quantum discord as a resource in quantum communication
- Monogamy of Quantum Discord by Multipartite Correlations
- Global Quantum discord of multi-qubit states