Power of one qumode for quantum computation
PHYSICAL REVIEW A 93:5 (2016) ARTN 052304
Converting coherence to quantum correlations
Physical Review Letters American Physical Society 116:16 (2016) 160407
Abstract:
Recent results in quantum information theory characterize quantum coherence in the context of resource theories. Here, we study the relation between quantum coherence and quantum discord, a kind of quantum correlation which appears even in nonentangled states. We prove that the creation of quantum discord with multipartite incoherent operations is bounded by the amount of quantum coherence consumed in its subsystems during the process. We show how the interplay between quantum coherence consumption and creation of quantum discord works in the preparation of multipartite quantum correlated states and in the model of deterministic quantum computation with one qubit.How discord underlies the noise resilience of quantum illumination
NEW JOURNAL OF PHYSICS 18 (2016) ARTN 043027
Pinning of fermionic occupation numbers: General concepts and one spatial dimension
Physical Review A American Physical Society 93:4 (2016) 042126
Abstract:
Analytical evidence for the physical relevance of generalized Pauli constraints (GPCs) has recently been provided in Schilling et al. [Phys. Rev. Lett. 110, 040404 (2013)PRLTAO0031-900710.1103/PhysRevLett.110.040404]: Natural occupation numbers λ ≡(λi) of the ground state of a model system in the regime of weak couplings κ of three spinless fermions in one spatial dimension were found extremely close, at a distance Dmin∼κ8 to the boundary of the allowed region. We provide a self-contained and complete study of this quasipinning phenomenon. In particular, we develop tools for its systematic exploration and quantification. We confirm that quasipinning in one dimension occurs also for larger particle numbers and extends to intermediate coupling strengths, but vanishes for very strong couplings. We further explore the nontriviality of our findings by comparing quasipinning by GPCs to potential quasipinning by the less restrictive Pauli exclusion principle constraints. This allows us to eventually confirm the significance of GPCs beyond Pauli's exclusion principle.Quantum thermodynamics for a model of an expanding Universe
Classical and Quantum Gravity IOP Publishing 33:3 (2016) 035003