Reprints of some of my papers

G. Tóth, Lower bounds on the quantum Fisher information based on the variance and various types of entropies, arxiv:1701.07461.

L. Knips, C. Schwemmer, N. Klein, J. Reuter, G. Tóth, and H. Weinfurter, How long does it take to obtain a physical density matrix?, arxiv:1512.06866.

I. Apellaniz, M. Kleinmann, O. Gühne, and G. Tóth, Optimal witnessing of the quantum Fisher information with few measurements, Phys. Rev. A 95, 032330 (2017), Editors' Suggestion; arxiv:1511.05203. [pdf]

G. Vitagliano, I. Apellaniz, M. Kleinmann, B. Lücke, C. Klempt, and G. Tóth, Entanglement and extreme spin squeezing of unpolarized states, New J. Phys. 19, 013027 (2017); arxiv:1605.07202. [pdf]

S. Altenburg, S. Wölk,
G. Tóth, and O. Gühne, Optimized parameter estimation in the presence of collective phase noise, Phys. Rev. A 94, 052306 (2016); arxiv:1607.05160. [pdf]

C. Budroni, G. Vitagliano, G. Colangelo, R. J. Sewell, O. Gühne, G. Tóth, and M.W. Mitchell, Quantum non-demolition measurement enables macroscopic Leggett-Garg tests [pdf], Phys. Rev. Lett. 115, 200403 (2015); arxiv:1503.08433.

I. Apellaniz, B. Lücke, J. Peise, C. Klempt, and G. Tóth, Detecting metrologically useful entanglement in the vicinity of Dicke states [pdf], New J. Phys. 17, 083027 (2015); arxiv:1412.3426.

C. Eltschka,
G. Tóth, and J. Siewert, Partial transposition as a direct link between concurrence and negativity, Phys. Rev. A 91, 032327 (2015) [pdf]; Editors' Suggestion; arXiv:1505.01833.

G. Tóth, T. Moroder, and O. Gühne, Evaluating convex roof entanglement measures [pdf, pdf2], Phys. Rev. Lett. 114, 160501 (2015); arxiv:1409.3806.

2014

G. Tóth
and I. Apellaniz, Quantum metrology from a quantum information science perspective [pdf], J. Phys. A: Math. Theor. 47, 424006 (2014), special issue "50 years of Bell's theorem"; arxiv:1405.4878.

N. Behbood, F. Martin Ciurana, G. Colangelo, M. Napolitano, G. Tóth, R.J. Sewell, M.W. Mitchell, Generation of macroscopic singlet states in a cold atomic ensemble [pdf,pdf2], Phys. Rev. Lett. 113, 093601 (2014). Editors' Suggestion, covered in Scientific American “Quantum Entanglement Creates New State of Matter”; arxiv:1403.1964.

C. Schwemmer,
G. Tóth, A. Niggebaum, T. Moroder, D. Gross, O. Gühne, and H. Weinfurter, Experimental Comparison of Efficient Tomography Schemes for a Six-Qubit State [pdf,pdf2], Phys. Rev. Lett. 113, 040503 (2014); arxiv:1401.7526.

B. Lücke, J. Peise, G. Vitagliano, J. Arlt, L. Santos, G. Tóth, and C. Klempt, Detecting multiparticle entanglement of Dicke states [pdf,pdf2], Phys. Rev. Lett. 112, 155304 (2014). Editors' Suggestion, synopsis at physics.aps.org, featured in the Revista Española de Física; arxiv:1403.4542.

G. Vitagliano, I. Apellaniz, I. L. Egusquiza, and G. Tóth, Spin squeezing and entanglement for arbitrary spin, Phys. Rev. A 89, 032307 (2014) [pdf]; arxiv:1310.2269.

2013


I. Urizar-Lanz, P. Hyllus, I. L. Egusquiza, M. W. Mitchell, and
G. Tóth, Macroscopic singlet states for gradient magnetometry [pdf,pdf2], Phys. Rev. A 88, 013626 (2013); arxiv:1203.3797.

G. Tóth
and D. Petz, Extremal properties of the variance and the quantum Fisher information, Phys. Rev. A 87, 032324 (2013) [pdf]; arxiv:1109.2831.

N. Behbood, M. Napolitano, G. Colangelo, B. Dobust, S. Palacios Álvarez, R. Sewell, G. Tóth, and M. W. Mitchell, Generation of a macroscopic singlet state in an atomic ensemble [pdf], in Conference on Lasers and Electro-Optics 2012, OSA Technical Digest (Optical Society of America, 2012), paper QF3E.3. http://dx.doi.org/10.1364/QELS.2012.QF3E.3

N. Behbood, M. Napolitano, G. Colangelo, B. Dubost, S. Palacios Álvarez, R. J. Sewell, G. Tóth, and M. W. Mitchell, Generation of a Macroscopic Singlet State in an Atomic Ensemble [pdf], in Research in Optical Sciences, OSA Technical Digest (Optical Society of America, 2012), paper QM1B.2. http://dx.doi.org/10.1364/QIM.2012.QM1B.2

D. Petz and G. TóthMatrix variances with projections [pdf], Acta Sci. Math. (Szeged) 78, 683 (2012).

Note: Acta Sci. Math. (Szeged) was founded by 
A. Haar (Haar measure, Haar transform, etc.) and F. Riesz.

T. Moroder, P. Hyllus,
G. Tóth, C. Schwemmer, A. Niggebaum, S. Gaile, O. Gühne, and H. Weinfurter, Permutationally invariant state reconstruction, New J. Phys. 14, 105001 (2012) [pdf], Focus issue on Quantum Tomography; arxiv:1205.4941.

P. Hyllus, L. Pezzé, A. Smerzi, and G. Tóth, Entanglement and Extreme Spin Squeezing for a Fluctuating Number of Indistinguishable Particles, Phys. Rev. A 86, 012337 (2012) [pdf]; arxiv:1204.5329.

G. Tóth
, Multipartite entanglement and high precision metrology [pdf], Phys. Rev. A 85, 022322 (2012); arxiv:1006.4368.

G. Vitagliano, P. Hyllus, I. L. Egusquiza, and G. Tóth, Spin squeezing inequalities for arbitrary spin [pdf,pdf2], Phys. Rev. Lett. 107, 240502 (2011); arxiv:1104.3147.

C. Schwemmer, G. Tóth, W. Wieczorek, D. Gross, R. Krischek, and H. Weinfurter, Permutationally invariant tomography of a four-qubit symmetric Dicke state [pdf], Proceedings of the Conference on Lasers and Electro-Optics Europe (CLEO EUROPE/EQEC), 2011 Conference on and 12th European Quantum Electronics Conference, Munich, Germany, 22-26 May 2011. Digital Object Identifier: http://dx.doi.org/10.1109/CLEOE.2011.5943393

N. Behbood, B. Dubost, M. Napolitano, M. Koschorreck, R. Sewell, G. Tóth, and M.W. Mitchell, Generation of macroscopic singlet states in atomic ensembles [pdf], Proceedings of the Conference on Lasers and Electro-Optics Europe (CLEO EUROPE/EQEC), 2011 Conference on and 12th European Quantum Electronics Conference, Munich, Germany, 22-26 May 2011. Digital Object Identifier: http://dx.doi.org/10.1109/CLEOE.2011.5942915

2010

E. Alba, G. Tóth, and J. J. García-Ripoll, Mapping the spatial distribution of entanglement in optical lattices [pdf], Phys. Rev. A 82, 062321 (2010); arxiv:1007.0985.

G. Tóth, W. Wieczorek, D. Gross, R. Krischek, C. Schwemmer, and H. Weinfurter, Permutationally invariant quantum tomography [pdf,pdf2], Phys. Rev. Lett. 105, 250403 (2010); arxiv:1005.3313.

T. Braun, A couple-of-minute interview: Géza Tóth (in Hungarian) [pdf], Life and Science (“Élet és Tudomány”) 19, 598 (2010).

W. Wieczorek, R. Krischek, A. Ozawa, G. Tóth, N. Kiesel, P. Michelberger, T. Udem and H. Weinfurter, Six-photon entangled Dicke state enabled by a UV enhancement cavity as novel SPDC photon source (invited paper, keynote presentation) [pdf], Proceedings of SPIE 7727, 77270L, 1-11 (2010).

I. Urizar-Lanz and G. Tóth, Number operator-annihilation operator uncertainty as an alternative of the number-phase uncertainty relation [pdf], Phys. Rev. A 81, 052108 (2010); arxiv:0907.3147.

G. Tóth and M.W. Mitchell, Generation of macroscopic singlet states in atomic ensembles [pdf], New J. Phys. 12, 053007 (2010); arxiv:0901.4110.

G. Tóth and O. Gühne, Separability criteria and entanglement witnesses for symmetric quantum states, Appl. Phys. B 98, 617 (2010 ) [pdf]; arxiv:0908.3679.

N. Behbood, B. Dubost, M. Napolitano, M. Koschorreck, R. Sewell, G. Tóth, and M. W. Mitchell, Generation of macroscopic singlet states in atomic ensembles [pdf], Abstract for The 17th Central European Workshop on Quantum Optics (CEWQO), St. Andrews, Scotland, UK, on 6th-11th June, 2010. Direct link: http://www.st-andrews.ac.uk/~cewqo10/submission/f5505.pdf

2009

W. Wieczorek, R. Krischek, N. Kiesel, P. Michelberger, G. Tóth, and H. Weinfurter, Experimental entanglement of a six-photon symmetric Dicke state, Phys. Rev. Lett. 103, 020504 (2009) [pdf], arxiv:0903.2213.

G. Tóth, W. Wieczorek, R. Krischek, N. Kiesel, P. Michelberger, and H. Weinfurter, Practical methods for witnessing genuine multi-qubit entanglement in the vicinity of symmetric states [pdf], New J. Phys. 11, 083002 (2009); arxiv:0903.3910.

G. Tóth, C. Knapp, O. Gühne, and H. J. Briegel, Generalized spin squeezing criteria: Entanglement detection with collective measurements [pdf], Proceedings of QCMC08, Calgary, Canada; AIP Conf. Proc. 1110, 41 (2009).

G. Tóth and O. Gühne, Entanglement and permutational symmetry [pdf], Phys. Rev. Lett. 102, 170503 (2009); arxiv:0812.4453.

O. Gühne and G. Tóth, Entanglement detection [pdf, online], Phys. Rep. 474, 1 (2009); arxiv:0811.2803.

G. Tóth, C. Knapp, O. Gühne, and H. J. Briegel, Spin squeezing and entanglement [pdf], Phys. Rev. A 79, 042334 (2009); arxiv:0806.1048.

2008

G. Tóth, QUBIT4MATLAB V3.0: A program package for quantum information science and quantum optics for MATLAB [pdf], Comput. Phys. Comm. 179, 430 (2008); arxiv:0709.0948.

2007

G. Tóth, C.Knapp, O. Gühne, and H.J. Briegel, Optimal spin squeezing inequalities detect bound entanglement in spin models [pdf], Phys. Rev. Lett. 99, 250405 (2007); quant-ph/0702219.

M.L. Almeida, S.Pironio, J. Barrett, G. Tóth, and A. Acín, Noise Robustness of the Nonlocality of Entangled Quantum States [pdf], Phys. Rev. Lett. 99, 040403 (2007); quant-ph/0703018.

G. Tóth and J.J. García-Ripoll, Efficient algorithm for multi-qudit twirling for ensemble quantum computation [pdf], Phys. Rev. A 75, 042311 (2007); quant-ph/0609052.

G. Tóth, Detection of multipartite entanglement in the vicinity of symmetric Dicke states [pdf], J. Opt. Soc. Am. B 24, 275 (2007), Feature issue on optical quantum information processing, Eds. B. Sanders, A. Zeilinger, and Y. Yamamoto; quant-ph/0511237.

N. Kiesel, C. Schmid, G. Tóth, E. Solano, and H. Weinfurter, Experimental Observation of Four-Photon Entangled Dicke State with High Fidelity [pdf], Phys. Rev. Lett. 98, 063604 (2007); quant-ph/0606234.

C. Schmid, N. Kiesel, W. Laskowski, E. Solano, G. Tóth, M. Zukowski, and H. Weinfurter; The Entanglement of the Symmetric Four-Photon Dicke State [pdf], p. 113 in book: QUANTUM COMMUNICATION AND SECURITY, M. Zukowski, S. Kilin, and J. Kowalik (Eds.), Proceedings of the NATO Advanced Research Workshop on Quantum Communication and Security, Gdansk, Poland, 10-13 Sept. 2006 IOS Press (ISBN 978-1-58603-749-9), Netherlands, 2007.

2006

M. Koniorczyk and G. Tóth, Quantum entanglement: An introduction [pdf], book chapter in Hungarian in New results of quantum optics and quantum electronics, Ed. K. Osvay, Eötvös Physical Society, 2006.

G. Tóth and A. Acín, Genuine three-partite entangled states with a local hidden variable model [pdf], Phys. Rev. A 74, 030306(R) (2006); quant-ph/0512088.

O. Gühne, M. Mechler, G. Tóth, and P. Adam, Entanglement criteria based on local uncertainty relations are strictly stronger than the computable cross norm criterion [pdf], Phys. Rev. A 74, 010301(R) (2006); quant-ph/0604050.

O. Gühne and  G. Tóth,  Energy and multipartite entanglement in multidimensional and frustrated spin models [pdf], Phys. Rev. A 73, 052319 (2006) ; quant-ph/0510186.

G. Tóth, O. Gühne, and H.J. Briegel, Two-setting Bell Inequalities for Graph States [pdf], Phys. Rev. A 73, 022303 (2006); quant-ph/0510007.

G. Tóth and  O. Gühne, Detection of multipartite entanglement with two-body correlations [pdf], Appl. Phys. B 82, 237 (2006); quant-ph/0602068.

2005

G. Tóth, Entanglement Witnesses in Spin Models [pdf], Phys. Rev. A 71, 010301(R) (2005); quant-ph/0406061.

G. Tóth and O. Gühne, Detecting Genuine Multipartite Entanglement with Two Local Measurements [pdf], Phys. Rev. Lett. 94, 060501 (2005); quant-ph/0405165.

G. Tóth, O. Gühne, M. Seevinck, and J. Uffink, Addendum to 'Sufficient conditions for three-particle entanglement and their tests in recent experiments' [pdf],  Phys. Rev. A 72, 014101 (2005); quant-ph/0505100.

O. Gühne, G. Tóth, P. Hyllus, and H.J. Briegel, Bell Inequalities for Graph States [pdf], Phys. Rev. Lett. 95, 120405 (2005); quant-ph/0410059.

G. Tóth and O. Gühne, Detecting Multi-Party Entanglement in the Stabilizer Formalism [pdf], Phys. Rev. A 72, 022340 (2005); quant-ph/0501020.

O. Gühne, G. Tóth, and H.J. Briegel, Multipartite entanglement in spin chains [pdf], New J. Phys. 7, 229 (2005); quant-ph/0502160.

N. Kiesel, C. Schmid, U. Weber, G. Tóth, O. Gühne, R. Ursin, and H. Weinfurter, Experimental Analysis of a 4-Qubit Cluster State [pdf], Phys. Rev. Lett. 95, 210502 (2005); quant-ph/0508128.

2004

G. Tóth and O. Gühne, Two measurement settings can suffice to verify multipartite entanglement [pdf], Proceedings of QCMC04, Edinburgh; AIP Conf. Proc. 734, 234 (2004); quant-ph/0409132.

G. Tóth, Entanglement Detection in Optical Lattices with Collective Measurements [pdf], Phys. Rev. A 69, 052327 (2004) ; quant-ph/0310039.

2003

G. Tóth, C. Denniston and J. M. Yeomans,  Hydrodynamics of  domain growth in nematic liquid crystals [pdf], Phys. Rev. E 67, 051705 (2003); cond-mat/0207322.

G. Tóth, C. Simon and J. I. Cirac,  Entanglement Detection Based on Interference and Particle Counting [pdf], Phys. Rev. A 68, 062310 (2003); quant-ph/0306086.

2002

C. Denniston, G. Tóth, J. M. Yeomans, Domain motion in confined liquid crystals [pdf], J. Stat. Phys. 107, 187 (2002); cond-mat/0108112.

G. Tóth, C. Denniston, J. M. Yeomans, Hydrodynamics of topological defects in nematic liquid crystals [pdf], Phys. Rev. Lett. 88,  105504 (2002); cond-mat/0201378.

G. Tóth, C. Denniston and J. M. Yeomans,  Modelling nematohydrodynamics in liquid crystal devices [pdf], Computer Physics Communication, 147/1-2, 7 (2002); cond-mat/0204318.

R. K. Kummamuru,  J. Timler, G. Tóth, C. S. Lent, R. Ramasubramaniam, A. O. Orlov, G. H. Bernstein and G. Snider, Power Gain in a Quantum-dot Cellular Automata Latch [pdf],  Appl. Phys. Lett. 81, 1332 (2002).

2001

A. Orlov, R. K. Kummamuru, R. Ramasubramaniam, G. Tóth, C. S. Lent, G. H. Bernstein, G. L. Snider, Experimental Demonstartion of a Latch in Clocked Quantum-dot Cellular Automata [pdf], Appl. Phys. Lett. 78, 1625 (2001).

G. Tóth, C. S. Lent,  Quantum Computing with Quantum-dot Cellular Automata [pdf],  Phys. Rev. A 63, 05231 (2001).

G. Tóth, C. S. Lent, The Role of Correlation in the Operation of  Quantum-dot Cellular Automata [pdf], J. Appl. Phys. 89, 7943 (2001); cond-mat/0104406.

G. Tóth, The Role of Correlation in the Operation of Quantum-dot Cellular Automata [pdf], Proceedings of the European Conference on Circuit Theory and Design (ECCTD'01), Helsinki, August 2001.

R.K. Kummamuru, A.O. Orlov, G. Tóth, J. Timler, R. Ramasubramaniam, C.S. Lent, G.H. Bernstein and G.L. Snider, Power Gain in a Quantum-dot Cellular Automata Latch [pdf], Proceedings of the First IEEE Conference on Nanotechnology (IEEE-NANO 2001), Hawaii, USA, 28-30 October, 2001.

2000

A. O. Orlov, I. Amlani, R. K. Kummamuru, R. Ramasubramaniam, G. Tóth, C. S. Lent, G. H. Bernstein, G. L. Snider, Experimental demonstration of clocked single-electron switching in quantum-dot cellular automata [pdf], Appl. Phys. Lett. 77, 295 (2000).

G. Tóth, Correlation and Coherence in Quantum-dot Cellular Automata [pdf], Ph.D. Thesis, University of Notre Dame, Indiana, 2000.

1999

G. Tóth, C. S. Lent, Quasiadiabatic switching for metal-island quantum-dot cellular automata [pdf], J. Appl. Phys. 85, 2977 (1999); cond-mat/0004457.

I. Amlani, A. Orlov, G. Tóth, C. S. Lent, G. H. Bernstein and G. L. Snider, Digital Logic Gate Using Quantum-dot Cellular Automata [pdf], Science 284, 289 (1999).

A. Orlov, I. Amlani, G. Tóth, C. S. Lent, G. H. Bernstein and G. L. Snider, Experimental demonstration of a binary wire for quantum-dot cellular automata [pdf], Appl. Phys. Lett. 74, 2875 (1999).

C. Gerousis, S. M., Goodnick, X. Wang, W. Porod, A. Csurgay, G. Tóth, C. Lent, Modeling Nanoelectronic CNN Cells: CMOS, SETs and QCAs [pdf], Proceedings of the European Conference on Circuit Theory and Design (ECCTD '99), Stresa, Italy, 1999.

G. Tóth, A. Orlov, I. Amlani, C. S. Lent, G. H. Bernstein, G. L. Snider, Conductance Suppression due to Correlated Electron Transport in Coupled Double-dots [pdf], Phys. Rev. B 60, 16906 (1999); cond-mat/9911173.

A. Radványi, L. Gáspár and G. Tóth, CNNUM Stereo Architecture and 3D Template Design Techniques [pdf], Int. J. Circ. Theor. Appl., 27, 25 (1999).

1998

G. Tóth, J. Timler and C. S. Lent, Quantum Computing with Quantum-dot Cellular Automata using Coherence Vector Formalism [pdf], Proceedings of the IEEE International Workshop on Computational Electronics (IWCE-6), Osaka, 1998.

A. Orlov, I. Amlani, G. Tóth, C. S. Lent, G. H. Bernstein  and G. L. Snider, Correlated Electron Transport in Coupled Metal Double-dots [pdf], Appl. Phys. Lett. 73, 2787 (1998).

1997

W. Porod, C. S. Lent, G. Tóth, H. Luo, A. Csurgay, Y.-F. Huang, and R.-W. Liu, Quantum-dot Cellular Nonlinear Networks: Computing with Locally-Connected Quantum Dot Arrays [pdf], Proceedings of the IEEE International Symposium on Circuits and Systems (ISCAS'97), 745, Hong Kong, 1997.

1996

G. Tóth, C. S. Lent, P. D. Tougaw, Y. Brazhnik, W. Weng, W. Porod, R-W. Liu, Y-F. Huang, Quantum Cellular Neural Networks [pdf], Superlattices and Microstructures 20, 473 (1996); cond-mat/0005038.

G. Tóth, P. Földesy, and T. Roska, Distance preserving 1D Turing-wave models via CNN, implementation of complex-valued CNN, and solving a simple inverse pattern problem (detection) [pdf], Proceedings of the IEEE International Workshop on Cellular Neural Networks and their Applications (CNNA-96), 109-114, Seville, 1996.

B. Fehér, P. Szolgay, T. Roska, A. Radványi, T. Szirányi, M. Csapodi, G. Tóth, K. László, and I. Szatmári, CNN-ACE: A Digital Floating Point CNN Emulator Engine [pdf], Proceedings of the IEEE International Workshop on Cellular Neural Networks and their Applications (CNNA-96), 273, Seville, 1996.

G. Tóth, P. Földesy, and T. Roska, Distance preserving 1D Turing-wave models via CNN, implementation of complex-valued CNN, and solving a simple inverse pattern problem (detection) [pdf], DNS-3-1996 (SzTAKI Research Report), Budapest, 1996.

1994

M. Sc. Thesis in Hungarian, Depth detection using cellular neural networks - three dimensional reconstruction of incompletely defined surfaces [pdf1, pdf2], Budapest, 1994.

M. Csapodi, L. Nemes, G. Tóth, T. Roska, and A. Radványi, Some novel analogic CNN algorithms for object rotation, 3D interpolation-approximation, and a door-in-a-floor problem [pdf], Proceedings of the Third IEEE International Workshop on Cellular Neural Networks and their Applications (CNNA-94), 435-439, Rome, 1994.

1988

Beginnings: 2.5K machine code program improving the BASIC interpreter of Commodore VC20 at the age of 16! Published in Commodore újság, 1988/2-3. [p1, p2, p3, p4, p5, p6, p7]