October 2014 archive

Oct 24

Joint field and solid-state qubits

Solid state superconducting devices coupled to coplanar transmission lines offer an exquisite architecture for quantum optical phenomena probing as well as for quantum computation implementation, being the object of intense theoretical and experimental investigation lately. In appropriate conditions the transmission line radiation modes can get strongly coupled to a superconducting device with only two levels …

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Oct 24

Conditions for Monogamy of Entanglement of Formation

We present a set of conditions that an arbitrary pure tripartite state must satisfy in order that the Entanglement of Formation (EOF) becomes a monogamic measure. The monogamic relation derived is deeply connected to the discrepancy between classical and quantum correlations, embodying the possible negative signal of the EOF tangle whenever the quantum correlation is …

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Oct 24

Locally Inaccessible Information and Entanglement of Formation

Quantum discord (QD) measures the fraction of the pairwise mutual information that is locally inaccessible, in a multipartite system. Fundamental aspects related to two important measures in quantum information theory the Entanglement of Formation (EOF) and the conditional entropy, can be understood in terms of the distribution of this form of Local Inaccessible Information (LII). …

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Oct 24

Entanglement irreversibility from quantum discord and quantum deficit

We relate the problem of irreversibility of entanglement with the recently defined measures of quantum correlation – quantum discord and one-way quantum deficit. We show that the entangle- ment of formation is always strictly larger than the coherent information and the entanglement cost is also larger in most cases. We prove irreversibility of entanglement under …

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Oct 24

Quantum measurement and control in optomechanical systems

During the week of 9-13 of May prof. Gerard Milburn is visiting us and is delivering a series of lectures from 9 to 12 on “Quantum measurement and control in optomechanical systems“ Prof. Gerard J. Milburn The Univerity of Queensland, Brisbane, Australia Director of  the “Centre of Excellence in Engineered Quantum Systems” The emerging field …

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