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Search: Markus J. Storcz
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1.
Decoherence, control, and encoding of coupled solidstate quantum bits
Title:
Decoherence, control, and encoding of coupled solidstate quantum bits
Author:
Storcz, Markus J.
Storcz, Markus J.
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Description:
In this thesis the decoherence properties, gate performance, control of solidstate quantum bits (qubits), and novel design proposals for solidstate qubits analogous to quantum optics are investigated. The qubits are realized as superconducting nanocircuits or quantum dot systems. The thesis elucidates both very appealing basic questions, like ...
In this thesis the decoherence properties, gate performance, control of solidstate quantum bits (qubits), and novel design proposals for solidstate qubits analogous to quantum optics are investigated. The qubits are realized as superconducting nanocircuits or quantum dot systems. The thesis elucidates both very appealing basic questions, like the generation and detection of deeply nonclassical states of the electromagnetic field, i.e., single photon Fock states, in the solidstate, but also presents a broad range of different strategies to improve the scalability and decoherence properties of solidstate qubit setups.
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Publisher:
LudwigMaximiliansUniversität München
Year of Publication:
20051114
Document Type:
Dissertation ; NonPeerReviewed
Subjects:
Fakultät für Physik
Fakultät für Physik
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Relations:
http://edoc.ub.unimuenchen.de/4604/
URL:
http://edoc.ub.unimuenchen.de/4604/1/Storcz_Markus.pdf
http://nbnresolving.de/urn:nbn:de:bvb:1946047
http://edoc.ub.unimuenchen.de/4604/1/Storcz_Markus.pdf
http://nbnresolving.de/urn:nbn:de:bvb:1946047
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Content Provider:
University of Munich: Digital theses
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2.
Decoherence and gate performance of coupled solid state qubits
Open Access
Title:
Decoherence and gate performance of coupled solid state qubits
Author:
Storcz, Markus J.
;
Wilhelm, Frank K.
Storcz, Markus J.
;
Wilhelm, Frank K.
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Description:
Solid state quantum bits are promising candidates for the realization of a {\em scalable} quantum computer. However, they are usually strongly limited by decoherence due to the many extra degrees of freedom of a solid state system. We investigate a system of two solid state qubits that are coupled via $\sigma_z^{(i)} \otimes \sigma_z^{(j)}$ type...
Solid state quantum bits are promising candidates for the realization of a {\em scalable} quantum computer. However, they are usually strongly limited by decoherence due to the many extra degrees of freedom of a solid state system. We investigate a system of two solid state qubits that are coupled via $\sigma_z^{(i)} \otimes \sigma_z^{(j)}$ type of coupling. This kind of setup is typical for {\em pseudospin} solidstate quantum bits such as charge or flux systems. We evaluate decoherence properties and gate quality factors in the presence of a common and two uncorrelated baths coupling to $\sigma_z$, respectively. We show that at low temperatures, uncorrelated baths do degrade the gate quality more severely. In particular, we show that in the case of a common bath, optimum gate performance of a CPHASE gate can be reached at very low temperatures, because our type of coupling commutes with the coupling to the decoherence, which makes this type of coupling attractive as compared to previously studied proposals with $\sigma_y^{(i)} \otimes \sigma_y^{(j)}$ coupling. Although less pronounced, this advantage also applies to the CNOT gate. ; Comment: 15 pages, 16 figures, 1 table, submitted to Phys. Rev. A
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Year of Publication:
20021216
Document Type:
text
Subjects:
Condensed Matter  Mesoscale and Nanoscale Physics ; Condensed Matter  Superconductivity ; Quantum Physics
Condensed Matter  Mesoscale and Nanoscale Physics ; Condensed Matter  Superconductivity ; Quantum Physics
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DDC:
190 Modern western philosophy
(computed)
URL:
http://arxiv.org/abs/condmat/0212374
http://arxiv.org/abs/condmat/0212374
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Content Provider:
ArXiv.org (Cornell University Library)
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3.
Decoherence of a twoqubit system with a variable bath coupling operator
Open Access
Title:
Decoherence of a twoqubit system with a variable bath coupling operator
Author:
Storcz, Markus J.
;
Hellmann, Frank
;
Hrelescu, Calin
;
Wilhelm, Frank K.
Storcz, Markus J.
;
Hellmann, Frank
;
Hrelescu, Calin
;
Wilhelm, Frank K.
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Description:
We examine the decoherence of an asymmetric twoqubit system that is coupled via a tunable interaction term to a common bath or two individual baths of harmonic oscillators. The dissipative dynamics are evaluated using the BlochRedfield formalism. It is shown that the behaviour of the decoherence effects is affected mostly by different symmetri...
We examine the decoherence of an asymmetric twoqubit system that is coupled via a tunable interaction term to a common bath or two individual baths of harmonic oscillators. The dissipative dynamics are evaluated using the BlochRedfield formalism. It is shown that the behaviour of the decoherence effects is affected mostly by different symmetries between the qubit operator which is coupled to the environment and temperature, whereas the differences between the two bath configurations are very small. Moreover, it is elaborated that small imperfections of the qubit parameters do not lead to a drastic enhancement of the decoherence rates. ; Comment: 10 pages, 5 figures
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Year of Publication:
20050429
Document Type:
text
Subjects:
Condensed Matter  Mesoscale and Nanoscale Physics ; Condensed Matter  Superconductivity ; Quantum Physics
Condensed Matter  Mesoscale and Nanoscale Physics ; Condensed Matter  Superconductivity ; Quantum Physics
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URL:
http://arxiv.org/abs/condmat/0504787
http://arxiv.org/abs/condmat/0504787
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ArXiv.org (Cornell University Library)
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4.
Intrinsic phonon decoherence and quantum gates in coupled lateral quantum dot charge qubits
Open Access
Title:
Intrinsic phonon decoherence and quantum gates in coupled lateral quantum dot charge qubits
Author:
Storcz, Markus J.
;
Hartmann, Udo
;
Kohler, Sigmund
;
Wilhelm, Frank K.
Storcz, Markus J.
;
Hartmann, Udo
;
Kohler, Sigmund
;
Wilhelm, Frank K.
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Description:
Recent experiments by Hayashi et al. [Phys. Rev. Lett. 91, 226804 (2003)] demonstrate coherent oscillations of a charge quantum bit (qubit) in laterally defined quantum dots. We study the intrinsic electronphonon decoherence and gate performance for the next step: a system of two coupled charge qubits. The effective decoherence model contains p...
Recent experiments by Hayashi et al. [Phys. Rev. Lett. 91, 226804 (2003)] demonstrate coherent oscillations of a charge quantum bit (qubit) in laterally defined quantum dots. We study the intrinsic electronphonon decoherence and gate performance for the next step: a system of two coupled charge qubits. The effective decoherence model contains properties of local as well as collective decoherence. Decoherence channels can be classified by their multipole moments, which leads to different lowenergy spectra. It is shown that due to the superOhmic spectrum, the gate quality is limited by the singlequbit Hadamard gates. It can be significantly improved, by using doubledots with weak tunnel coupling. ; Comment: 11 pages, 7 figures
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Year of Publication:
20050707
Document Type:
text
Subjects:
Condensed Matter  Mesoscale and Nanoscale Physics ; Quantum Physics
Condensed Matter  Mesoscale and Nanoscale Physics ; Quantum Physics
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URL:
http://arxiv.org/abs/condmat/0507178
http://arxiv.org/abs/condmat/0507178
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ArXiv.org (Cornell University Library)
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5.
Macroscopic EinsteinPodolskyRosen pairs in superconducting circuits
Open Access
Title:
Macroscopic EinsteinPodolskyRosen pairs in superconducting circuits
Author:
Wei, L. F.
;
Liu, Yuxi
;
Storcz, Markus J.
;
Nori, Franco
Wei, L. F.
;
Liu, Yuxi
;
Storcz, Markus J.
;
Nori, Franco
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Description:
We propose an efficient approach to prepare EinsteinPodolskyRosen (EPR) pairs in currently existing Josephson nanocircuits with capacitive couplings. In these fixed coupling circuits, twoqubit logic gates could be easily implemented while, strictly speaking, singlequbit gates cannot be easily realized. For a known twoqubit state, conditiona...
We propose an efficient approach to prepare EinsteinPodolskyRosen (EPR) pairs in currently existing Josephson nanocircuits with capacitive couplings. In these fixed coupling circuits, twoqubit logic gates could be easily implemented while, strictly speaking, singlequbit gates cannot be easily realized. For a known twoqubit state, conditional singlequbit operation could still be designed to evolve only the selected qubit and keep the other qubit unchanged; the rotation of the selected qubit depends on the state of the other one. These conditional singlequbit operations allow to deterministically generate the wellknown EinsteinPodolskyRosen pairs, represented by EPRBell (or Bell) states. Quantumstate tomography is further proposed to experimentally confirm the generation of these states. The decays of the prepared EPR pairs are analyzed using numerical simulations. Possible application of the generated EPR pairs to test Bell's Inequality is also discussed. ; Comment: small changes in text
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Year of Publication:
20050803
Document Type:
text
Subjects:
Quantum Physics ; Condensed Matter  Superconductivity
Quantum Physics ; Condensed Matter  Superconductivity
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DDC:
115 Time
(computed)
URL:
http://arxiv.org/abs/quantph/0508027
http://arxiv.org/abs/quantph/0508027
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Content Provider:
ArXiv.org (Cornell University Library)
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(5) Storcz, Markus J.
(3) Wilhelm, Frank K.
(1) Hartmann, Udo
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