Author Archives: mcesardeoliveira

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 … Continue reading

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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 … Continue reading

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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 … Continue reading

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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 … Continue reading

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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, … Continue reading

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Generation of Superposition States and Charge-Qubit Relaxation Probing in a Circuit

a) Schematic setup, with the central transmission line (resonator) capacitively coupled to the source and drain, and capacitively coupled to a SQUID-type qubit. (b) Variable energy levels of the qubit (0 < n < 1), with an external classical magnetic … Continue reading

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Entanglement, quantum discord, and the power of the quantum computer

Schematic illustration of the Quantum Computation with only a single pure qubit protocol (DQC1). A represents the pure qubit, B the maximally mixed state, obtained through maximal entanglement with the environment E. From left to right, initially B is entangled … Continue reading

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Phase transition, entanglement and squeezing in a triple-well condensate

Occupational Husimi representation (left) and phase distribution (right) of the ground state for N = 30, Ω = −1, μ = 0 and self-collision parameter values: (a) χ=0, (b) χ=2 and (c) χ=3. In (b) we observe the squeezing in … Continue reading

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