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Joint field and solidstate 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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Tagged classical correlation, conditional entropy, discrepancy, quantum correlation
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 oneway 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 913 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 ChargeQubit 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 SQUIDtype 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 triplewell condensate
Occupational Husimi representation (left) and phase distribution (right) of the ground state for N = 30, Ω = −1, μ = 0 and selfcollision 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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