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Ion traps
... fields. Qubits are stored in stable electronic states of each ion, and quantum information can be processed and transferred ... Lasers are applied to induce coupling between the qubit states (for single qubit operations) or coupling between the internal qubit ...
Wiki article - Anonymous (not verified) - 26/10/2015 - 17:56 - 0 comments
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Graduate student and Postdoctoral positions in quantum photonics and quantum information
... capacity built around it. We investigate how to generate states of light in which quantum information can be encoded. The generation of these states requires nonlinear interactions between modes of light, which can be ...
Position - nquesada - 31/01/2022 - 00:49 - 0 comments
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PPT criterion
... for separability, i.e. in "high" dimensions there exist states that remain positive under partial transposition (PPT states) even if they are entangled. If instead the bipartite system has ...
Wiki article - Anonymous (not verified) - 26/10/2015 - 17:56 - 0 comments
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Additivity
... theory. The Holevo-Schumacher-Westmoreland (HSW) theorem states that the classical capacity of a memoryless quantum channel Λ ... is nothing stopping the sender encoding the message into states that are entangled across channels such that the input ρ ( ...
Wiki article - Anonymous (not verified) - 26/10/2015 - 17:56 - 0 comments
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PPT separability criterion
... for separability, i.e. in "high" dimensions there exist states that remain positive under partial transposition (PPT states) even if they are entangled. If instead the bipartite system has ...
Wiki article - Anonymous (not verified) - 07/07/2017 - 21:06 - 0 comments
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Quantum information
... quantum communication needed to convey unknown quantum states. Imagine that a party is given a sequence of unknown quantum states chosen randomly from some distribution denoted by the density matrix ...
Wiki article - JMiszczak - 26/10/2015 - 17:56 - 0 comments
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Squashed entanglement
... the definition of Entanglement of Formation for pure states. Motivation for definition of CMI Entanglement CMI Entanglement ... B})$ given by Eq.(1) vanishes for all separable states. When $\varrho_{A, B}$ is a pure state, one gets ... the definition of Entanglement of Formation for pure states, as given in Ben96 . Next suppose $|\psi_{A,B}^\lambda>$ ...
Wiki article - Anonymous (not verified) - 26/10/2015 - 17:56 - 0 comments
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Enhancement of channel capacities with entanglement
... making use of an unlimited number of maximally entangled states. The formal definition proceeds as follows. Alice and Bob are ... I(A;B)_\sigma, where the maximization is over states σ A B = N( φ A A ʹ ) arising from ...
Wiki article - Anonymous (not verified) - 26/10/2015 - 17:56 - 0 comments
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Entanglement of assistance
... of assistance was initially defined for tripartite pure states as the maximal entropy of entanglement that can be created between ... subsystem and telling them the outcomes. For tripartite pure states entanglement of assistance is simply a function of Alice and Bob’s ...
Wiki article - Anonymous (not verified) - 26/10/2015 - 17:56 - 0 comments
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Optical Lattices
... to act as the basis of our qubits - these are both ground states and therefore stable. One-qubit Gates For one--qubit gates, we ... confinement of the atoms. It is typical to choose our basis states to be magnetically sensitive, such as |0>=|F=1,m_f=1> and ...
Wiki article - Anonymous (not verified) - 26/10/2015 - 17:56 - 0 comments