Zobrazeno 1 - 10
of 11
pro vyhledávání: '"Paulo E. M. F. Mendonca"'
Autor:
R. Y. Teh, Peter D. Drummond, Margaret D. Reid, Paulo E. M. F. Mendonca, Yeong-Cherng Liang, Yu Hao Yeh
Applications of quantum technology often require fidelities to quantify performance. These provide a fundamental yardstick for the comparison of two quantum states. While this is straightforward in the case of pure states, it is much more subtle for
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3188b581780d70ba3d69d600e3034149
http://arxiv.org/abs/1810.08034
http://arxiv.org/abs/1810.08034
We consider the problems of maximizing the entanglement negativity of X-form qubit-qutrit density matrices with (i) a fixed spectrum and (ii) a fixed purity. In the first case, the problem is solved in full generality whereas, in the latter, partial
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::34b8d0d457c54a6c5a09df4ad714597c
http://arxiv.org/abs/1612.01214
http://arxiv.org/abs/1612.01214
Publikováno v:
Quantum Information and Computation. 11:677-694
We present a constructive argument to demonstrate the universality of the sudden death of entanglement in the case of two non-interacting qubits, each of which generically coupled to independent Markovian environments at zero temperature. Conditions
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b5e6d3d18b62a379eba6e436dacd1062
https://doi.org/10.26421/qic11.7-8-9
https://doi.org/10.26421/qic11.7-8-9
Autor:
Diógenes Galetti, Paulo E. M. F. Mendonca, Seyed Mohammad Hashemi Rafsanjani, Marcelo A. Marchiolli
Publikováno v:
Web of Science
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
For every possible spectrum of $2^N$-dimensional density operators, we construct an $N$-qubit X-state of same spectrum and maximal genuine multipartite (GM-) concurrence, hence characterizing a global unitary transformation that --- constrained to ou
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6e350540477df55089ec3034c77c5796
We demonstrate that for every two-qubit state there is a X-counterpart, i.e., a corresponding two-qubit X-state of same spectrum and entanglement, as measured by concurrence, negativity or relative entropy of entanglement. By parametrizing the set of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cbd537572a1b9e2d019cc2bf7e5e20dd
We introduce a self-consistent theoretical framework associated with the Schwinger unitary operators whose basic mathematical rules embrace a new uncertainty principle that generalizes and strengthens the Massar-Spindel inequality. Among other remark
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1f6b7011b1eb379b93918898447a547d
Autor:
Marcelo A. Marchiolli, Paulo E. M. F. Mendonca, Reginaldo de Jesus Napolitano, Christopher J. Foster, Yeong-Cherng Liang
Publikováno v:
Scopus
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Made available in DSpace on 2022-04-28T20:46:39Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-11-19 We propose an alternative fidelity measure (namely, a measure of the degree of similarity) between quantum states and benchmark it against a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a92c685086f0fcbbce1165db83aff9c3
https://doi.org/10.1103/physreva.78.052330
https://doi.org/10.1103/physreva.78.052330
In classical control theory, tracking refers to the ability to perform measurements and feedback on a classical system in order to enforce some desired dynamics. In this paper we investigate a simple version of quantum tracking, namely, we look at ho
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0a7aa21bcc6d092f38a8e49dc05bf97a
http://arxiv.org/abs/0802.3896
http://arxiv.org/abs/0802.3896
Publikováno v:
International Journal of Quantum Information. 13:1550023
For every N-qubit density matrix written in the computational basis, an associated "X-density matrix" can be obtained by vanishing all entries out of the main- and anti-diagonals. It is very simple to compute the genuine multipartite (GM) concurrence
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5e50b1f916b229065033d6437f4caa2b
https://doi.org/10.1142/s0219749915500239
https://doi.org/10.1142/s0219749915500239
Autor:
Stephen D. Bartlett, Andrew C. Doherty, Agata M. Brańczyk, Alexei Gilchrist, Paulo E. M. F. Mendonca
Measurements in quantum mechanics cannot perfectly distinguish all states and necessarily disturb the measured system. We present and analyse a proposal to demonstrate fundamental limits on quantum control of a single qubit arising from these propert
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::170dea7e17dfc79d22c3f846d56e9e01
http://arxiv.org/abs/quant-ph/0608037
http://arxiv.org/abs/quant-ph/0608037