236 Hits in 13.4 sec

Nuclear Spin 3=2 Electric Quadrupole Relaxation as a Quantum Computation [article]

A. M. Souza, A. Gavini-Viana, I. S. Oliveira, R. S. Sarthour, R. Auccaise, J. Teles, E. R. deAzevedo, T. J. Bonagamba
2011 arXiv   pre-print
From the Redfield theory, we were able to describe the quadrupolar relaxation as a computational process in the case of spin 3/2 systems, through a model in which the environment is comprised by seven  ...  The interaction between the environment and the spin 3/2 nuclei is then described by a quantum circuit fully compatible with the Redfield theory of relaxation.  ...  We also thank the support of the Brazilian network project National Institute for Quantum Information. AMS would like to acknowledge the government of Ontario -Canada.  ... 
arXiv:1105.2539v1 fatcat:pumqpzshq5gm5kvr26224zbcqy

Optical spin initialization of spin-3/2 silicon vacancy centers in 6H-SiC at room temperature [article]

Harpreet Singh, Andrei N. Anisimov, I. D. Breev, Pavel G. Baranov, Dieter Suter
2021 arXiv   pre-print
In this work, we study the optical alignment of the spin 3/2 negatively charged silicon vacancy in 6H-SiC.  ...  Silicon vacancies in silicon carbide have been proposed as an alternative to nitrogen vacancy centers in diamonds for spintronics and quantum technologies.  ...  spin 3/2 [43, 45] .  ... 
arXiv:2007.08516v4 fatcat:swwrml3rbncahbybr6pljfs7vu

Quantum logical operations for spin 3/2 quadrupolar nuclei monitored by quantum state tomography

F.A. Bonk, E.R. deAzevedo, R.S. Sarthour, J.D. Bulnes, J.C.C. Freitas, A.P. Guimarães, I.S. Oliveira, T.J. Bonagamba
2005 Journal of magnetic resonance (San Diego, Calif. 1997 : Print)  
Experimental demonstrations are performed using a generalized form of the recently developed method for quantum state tomography in spin 3/2 systems.  ...  This article presents the realization of many self-reversible quantum logic gates using two-qubit quadrupolar spin 3/2 systems.  ...  R.S.S. especially acknowledges the Brazilian Quantum Information-CNPq projectand the CAPES Pro-doc grant program. A special thank for Dr. E.L.G. Vidoto for constructing the NMR probe, and for Prof.  ... 
doi:10.1016/j.jmr.2005.04.009 pmid:15921938 fatcat:shl7mzaqh5expmzw445o6cybe4

Multiple-Time Correlation Functions in Spin-3/2 Solid-State NMR Spectroscopy

Roland Böhmer
2000 Journal of magnetic resonance (San Diego, Calif. 1997 : Print)  
Conditions for the generation of pure, quadrupole modulated multipolar spin orders and for the detection of two-and four-time correlation functions are discussed.  ...  Diezemann and A. Titze for many fruitful discussions. Stimulating conversations with B. Geil, G. Hinze, T. Jörg, F. Qi, H. Sillescu, and S.  ...  Wimperis as well as helpful comments by an anonymous referee are also gratefully acknowledged. The Deutsche Forschungsgemeinschaft is thanked for supporting this project (Grant Bo1301/5).  ... 
doi:10.1006/jmre.2000.2162 pmid:11042049 fatcat:z554pzemebhxldffn33x4727mi

Experimental implementation of quantum information processing by Zeeman perturbed nuclear quadrupole resonance [article]

J. Teles, C. Rivera-Ascona, R. S. Polli, R. Oliveira-Silva, E. L. G. Vidoto, J. P. Andreeta, T. J. Bonagamba
2014 arXiv   pre-print
The NQR quantum operations were implemented using a single crystal sample of KClO3 and observing 35Cl nuclei, which posses spin 3/2 and give rise to a 2-qubit system.  ...  Nuclear magnetic resonance (NMR) has been widely used in the context of quantum information processing (QIP).  ...  In nuclear quadrupole resonance (NQR), the main interaction is due to the nuclear electric quadrupole moment in the presence of a local electric field gradient.  ... 
arXiv:1404.0095v1 fatcat:e77eiszg6betddvpmzv4xkd2ei

Quantum information processing by nuclear magnetic resonance on quadrupolar nuclei

J. Teles, E. R. DeAzevedo, J. C. C. Freitas, R. S. Sarthour, I. S. Oliveira, T. J. Bonagamba
2012 Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences  
We also review some work in the literature concerning the relaxation of pseudo-pure states in spin 3 2 systems as well as its modelling in both the Redfield and Kraus formalisms.  ...  The possibilities and advantages of using nuclear quadrupole resonance experiments for quantum information processing are also discussed.  ...  This work was performed as part of the Brazilian National Institute of Science and Technology for Quantum Information (INCT-IQ).  ... 
doi:10.1098/rsta.2011.0365 pmid:22946040 fatcat:fynmbyvxhrdunnlfpmw737mpjy

Nuclear hyperpolarization in solids and the prospects for nuclear spintronics

Jeffrey A. Reimer
2010 Solid State Nuclear Magnetic Resonance  
Nuclear hyperpolarization can be achieved in a number of ways.  ...  to each other, to affect computation, memory, or informational technology schemes?"  ...  I would also like to thank the Deutsche Forschungsgemeinschaft (DFG) and Professor Bernhard Blümich for the opportunity to serve as a Mercator Professor at Rheinisch-Westfaelische Technische Hochschule  ... 
doi:10.1016/j.ssnmr.2010.04.001 pmid:20413281 fatcat:3z2rb32ufndofgiaiu3kzdbsiy

Quantum information processing through nuclear magnetic resonance

J. D. Bulnes, F. A. Bonk, R. S. Sarthour, E. R. de Azevedo, J. C. C. Freitas, T. J. Bonagamba, I. S. Oliveira
2005 Brazilian journal of physics  
We discuss the applications of Nuclear Magnetic Resonance (NMR) to quantum information processing, focusing on the use of quadrupole nuclei for quantum computing.  ...  A brief discussion on the perspectives for NMR quantum computing is presented at the end.  ...  ρ = I + r(t) · σ 2 FIG. 5 : 5 The trajectory of the Bloch vector, for each individual qubit, during the evolution of the spin 3/2 quantum system, under the application of Hadamard gate twice.  ... 
doi:10.1590/s0103-97332005000400006 fatcat:7bfjgfj6ubba5nae5lpm6o23oy

Nanometre-scale nuclear-spin device for quantum information processing

Y Hirayama, A Miranowicz, T Ota, G Yusa, K Muraki, S K Ozdemir, N Imoto
2006 Journal of Physics: Condensed Matter  
We have developed semiconductor point contact devices in which nuclear spins in a nanoscale region are coherently controlled by all-electrical methods.  ...  As the starting point of quantum manipulations, we have experimentally prepared the effective pure states for the I = 3/2 nuclear spin system.  ...  YH is partially supported by a Grant-in-Aid for Scientific Research from JSPS. AM is supported by the Polish State Committee for Scientific Research under grant No 1 P03B 064 28.  ... 
doi:10.1088/0953-8984/18/21/s13 fatcat:htjdesqnoneevchdgcx6tyukr4


2011 International Journal of Quantum Information  
In this paper we use the Nuclear Magnetic Resonance (NMR) to write eletronic states of a ferromagnetic system into a high-temperature paramagnetic nuclear spins.  ...  Through the control of phase and duration of radiofrequency pulses we set the NMR density matrix populations, and apply the technique of quantum state tomography to experimentally obtain the matrix elements  ...  This work was performed as part of the Brazilian National Institute for Science and Technology of Quantum Information (INCT-IQ).  ... 
doi:10.1142/s021974991100785x fatcat:7sulfzmixfbd5jz4pavs7vbgny

Dynamic nuclear polarization and nuclear magnetic resonance in the vicinity of edge states of a 2DES in GaAs quantum wells

Clifford R. Bowers, Joshua D. Caldwell, Guennadi Gusev, Alexey E. Kovalev, Eugene Olshanetsky, John L. Reno, Jerry A. Simmons, Sergey A. Vitkalov
2006 Solid State Nuclear Magnetic Resonance  
The method is applied to the study of electric quadrupole interactions, weakly allowed overtone transitions, and evaluation of the extent of electron wave function delocalization in the wide quantum well  ...  Nuclear magnetic resonance is detected via the in-plane conductivity of a two-dimensional electron system at unity Landau level filling factor in the regime of the quantum Hall effect in narrow and wide  ...  Beyond spectroscopic characterization of internal Hamiltonians and relaxation mechanisms, quantum information processing requires (a) preparation of the density operator in a pure state and (b) preparation  ... 
doi:10.1016/j.ssnmr.2005.08.011 pmid:16216476 fatcat:bsqesl37kjdklksp5cipvsxiaq

Optically rewritable patterns of nuclear magnetization in gallium arsenide

Jonathan P. King, Yunpu Li, Carlos A. Meriles, Jeffrey A. Reimer
2012 Nature Communications  
Here we show that, by exploiting different mechanisms for electron -nuclear interaction in the optical pumping process, we are able to control and image the sign of the nuclear polarization as a function  ...  The control of nuclear spin polarization is important to the design of materials and algorithms for spin-based quantum computing and spintronics.  ...  For a spin3 2 / system, the polarization is given by I B k T B k T Q N N ,0 0 0 = 1 2 [ / ( 2 ) ] [ / ( ) ] . tanh tanh g g + Figure 2 | 2 Spatial patterns of 69 Ga nuclear magnetism as a function of  ... 
doi:10.1038/ncomms1918 pmid:22735446 fatcat:gyjqwheo4ng4defkmrr74ee5tu

Loschmidt echo driven by hyperfine and electric-quadrupole interactions in nanoscale nuclear spin baths

Ekrem Taha Güldeste, Ceyhun Bulutay
2018 Physical review B  
The nuclear spin bath (NSB) dynamics and its quantum control are of importance for the storage and processing of quantum information within a semiconductor environment.  ...  For this case, additionally the effect of nuclear electric quadrupole interaction is taken into account where its biaxiality term is influential on the decoherence.  ...  In Fig. 4 the temporal behaviors of LE of spin-3/2 and -9/2 NSBs are compared for various mean f Q = N i=1 f Qi /N rates from weak to strong coupling limits.  ... 
doi:10.1103/physrevb.98.085202 fatcat:szq73ex5hvdgfdcjgwkxfkbkue

Quantum-state tomography for quadrupole nuclei and its application on a two-qubit system

F. A. Bonk, R. S. Sarthour, E. R. deAzevedo, J. D. Bulnes, G. L. Mantovani, J. C. C. Freitas, T. J. Bonagamba, A. P. Guimarães, I. S. Oliveira
2004 Physical Review A. Atomic, Molecular, and Optical Physics  
Further applications in the context of pure NMR and in the context of quantum information processing, as well as generalizations for higher spins, are discussed.  ...  A method for performing quantum state tomography for quadrupole nuclei is presented in this paper.  ...  R.S.S. especially acknowledges the Brazilian Quantum Information-CNPq project-and the CAPES Prodoc grant program. A special thanks to E. L. G. Vidoto for constructing the NMR probe.  ... 
doi:10.1103/physreva.69.042322 fatcat:fx5ndh3tcraubff6ymyv3fmq3m

Nuclear spin effects in semiconductor quantum dots

E. A. Chekhovich, M. N. Makhonin, A. I. Tartakovskii, A. Yacoby, H. Bluhm, K. C. Nowack, L. M. K. Vandersypen
2013 Nature Materials  
For an electron confined in a GaAs quantum dot and interacting with a typical number of 10 6 spin-3/2 nuclei, this results in σ Bnuc ≈ 4 mT.  ...  computation using semiconductor quantum dots.  ...  For an electron confined in a GaAs quantum dot and interacting with a typical number of 10 6 spin-3/2 nuclei, this results in σ Bnuc ≈ 4 mT.  ... 
doi:10.1038/nmat3652 pmid:23695746 fatcat:eakbohj5rrfaphxs2rhl377ve4
« Previous Showing results 1 — 15 out of 236 results