Results 61 to 70 of about 824,226 (150)

Steering witnesses for unknown Gaussian quantum states

New Journal of Physics, 2023
We define and fully characterize the witnesses based on second moments detecting steering in Gaussian states by means of Gaussian measurements. All such tests, which arise from linear combination of variances or second moments of canonical operators, are
Tatiana Mihaescu, Hermann Kampermann, Aurelian Isar, Dagmar Bruß   +3 more
doaj   +1 more source

Optimal N-to-M Cloning of Quantum Coherent States [PDF]

, 2000
The cloning of continuous quantum variables is analyzed based on the concept of Gaussian cloning machines, i.e., transformations that yield copies that are Gaussian mixtures centered on the state to be copied.
A. S. Holevo, C. W. Helstrom, C.-S. Niu, D. Bruss, D. Bruss, D. Bruss, D. Dieks, D. F. Walls, E. Arthurs, L. Mandel, M. Keyl, N. Gisin, N. Gisin, N. J. Cerf, N. J. Cerf, N. J. Cerf, N. J. Cerf, R. F. Werner, S. Iblisdir, S. Stenholm, V. Buzek, V. Buzek, W. K. Wooters   +22 more
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Operational significance of nonclassicality in nonequilibrium Gaussian quantum thermometry

New Journal of Physics
We provide new operational significance of nonclassicality in nonequilibrium temperature estimation of bosonic baths with Gaussian probe states and Gaussian dynamics. We find a bound on the thermometry performance using classical probe states.
Safoura Mirkhalaf, Mohammad Mehboudi, Zohre Nafari Qaleh, Saleh Rahimi-Keshari   +3 more
doaj   +1 more source

Quantum coherence of Fermionic Gaussian states

Results in Physics
In the present paper, quantum coherence of fermionic Gaussian states is investigated from the point of quantum resource theory. Some characterizations of m-mode (m≥1) incoherent fermionic Gaussian states and incoherent fermionic Gaussian channels are ...
Yangyang Wang, Xiaofei Qi, Jinchuan Hou, Bing Xu   +3 more
doaj   +1 more source

Classical simulation of non-Gaussian fermionic circuits [PDF]

Quantum
We propose efficient algorithms for classically simulating fermionic linear optics operations applied to non-Gaussian initial states. By gadget constructions, this provides algorithms for fermionic linear optics with non-Gaussian operations.
Beatriz Dias, Robert Koenig
doaj   +1 more source

Extremality of Gaussian quantum states

, 2005
We investigate Gaussian quantum states in view of their exceptional role within the space of all continuous variables states. A general method for deriving extremality results is provided and applied to entanglement measures, secret key distillation and ...
A. S. Holevo, C. D. Cushen, G. Giedke, G. F. Dell’Antonio, Geza Giedke, J. Ignacio Cirac, M. Horodecki, Michael M. Wolf, P. A. P. Moran, R. L. Hudson   +9 more
core   +1 more source

The power of noisy fermionic quantum computation

New Journal of Physics, 2013
We consider the realization of universal quantum computation through braiding of Majorana fermions supplemented by unprotected preparation of noisy ancillae. It has been shown by Bravyi (2006 Phys. Rev.
Fernando de Melo, Piotr Ćwikliński, Barbara M Terhal   +2 more
doaj   +1 more source

Boson Sampling from Gaussian States

, 2013
We pose a generalized Boson Sampling problem. Strong evidence exists that such a problem becomes intractable on a classical computer as a function of the number of Bosons.
Laing, A., Lund, A. P., O'Brien, J. L, Rahimi-Keshari, S., Ralph, T. C., Rudolph, T.   +5 more
core   +1 more source

Quantifying decoherence in continuous variable systems

, 2005
We present a detailed report on the decoherence of quantum states of continuous variable systems under the action of a quantum optical master equation resulting from the interaction with general Gaussian uncorrelated environments. The rate of decoherence
A Serafini, Adesso G, Adesso G Illuminati F, Adesso G Illuminati F, Arnold V I, Arvind, Barnett S M, Barnett S M, Barnett S M, Benedict M G, Braunstein S L, Braunstein S L, Brodier O, Brown K R, Brune M, Caldeira A O, Cirac J I Eisert J Giedke G Lewenstein M Plenio M B Werner R F Wolf M M, D'Ariano G M, Dakna M, Dakna M, Dodonov V V, Duan L-M, Dupertuis M-A, Dupertuis M-A, Eisert J, F Illuminati, Ficek Z, Filip R, Gardiner C W, Gheri K M, Giovannetti V, Giovannetti V, Goetsch P, Gradstein I, Grewal K S, Harel G, Harel G, Haroche S, Henderson L, Holevo A S, Janszky J, Kenfack A, Kennedy T A B, Kim M S, L?tkenhaus N, Lee C T, Leonski W, M G A Paris, Marian P, Monroe C, Nayak N, Ogawa T, Paris M G A, Paris M G A, Paris M G A, Paternostro M, Prauzner-Bechcicki J S, S De Siena, Schr?dinger E, Serafini A, Serafini A, Serafini A, Serafini A, Serafini A, Simon R, Simon R, Simon R, Takeoka M, Tombesi P, Tombesi P, Vandersypen L M K, Venugopalan A, Vidiella-Barranco A, Villas-B?as C J, Walls D, Walls D F, Wenger J, Wieman C E, Williamson J, Wiseman H M, Yurke B, Zhang T C, Zippilli S, Zurek W H   +83 more
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Unconditional measurement-based quantum computation with optomechanical continuous variables [PDF]

, 2018
Universal quantum computation encoded over continuous variables can be achieved via Gaussian measurements acting on entangled non-Gaussian states. However, due to the weakness of available nonlinearities, generally these states can only be prepared ...
Bose, Sougato, Ferraro, Alessandro, Houhou, Oussama, Moore, Darren W.   +3 more
core   +1 more source