02.90.+f Foundational issues of quantum mechanics

Hierarchy of Steering Criteria Based on Moments for All Bipartite Quantum Systems

Date: 
2015-07-15 - 2015-11-17
Author(s): 

Ioannis Kogias, Paul Skrzypczyk, Daniel Cavalcanti, Antonio Acín, Gerardo Adesso

Reference: 

Phys. Rev. Lett. 115, 210401

Einstein-Podolsky-Rosen steering is a manifestation of quantum correlations exhibited by quantum systems that allows for entanglement certification when one of the subsystems is not characterized. Detecting the steerability of quantum states is essential to assess their suitability for quantum information protocols with partially trusted devices.

Postquantum Steering

Date: 
2015-05-11 - 2015-11-04
Author(s): 

Ana Belén Sainz, Nicolas Brunner, Daniel Cavalcanti, Paul Skrzypczyk, Tamás Vértesi

Reference: 

Phys. Rev. Lett. 115, 190403

The discovery of postquantum nonlocality, i.e., the existence of nonlocal correlations that are stronger than any quantum correlations but nevertheless consistent with the no-signaling principle, has deepened our understanding of the foundations of quantum theory.

Almost quantum correlations

Date: 
2014-06-20 - 2015-02-20
Author(s): 

Miguel Navascués, Yelena Guryanova, Matty J. Hoban, Antonio Acín

Reference: 

Nature Communications 6, Article number: 6288

Quantum theory is not only successfully tested in laboratories every day but also constitutes a robust theoretical framework: small variations usually lead to implausible consequences, such as faster-than-light communication. It has even been argued that quantum theory may be special among possible theories.

Universal quantum computation in integrable systems

Date: 
2016-03-04
Author(s): 

5. S. Lloyd, S. Montangero

Reference: 

arXiv:1407.6634

Quantized integrable systems can be made to perform universal quantum computation by the application of a global time-varying control. The action-angle variables of the integrable system function as qubits or qudits, which can be coupled selectively by the global control to induce universal quantum logic gates. By contrast, chaotic quantum systems, even if controllable, do not generically allow quantum computation under global control.

Superfluid density and quasi-long-range order in the one-dimensional disordered Bose-Hubbard model

Date: 
2016-01-18
Author(s): 

M. Gerster, M. Rizzi, F. Tschirsich, P. Silvi, R. Fazio, S. Montangero

Reference: 

New J. Phys. 18, 015015 (2016)
http://dx.doi.org/10.1088/1367-2630/18/1/015015

We study the equilibrium properties of the one-dimensional disordered Bose–Hubbard model by means of a gauge-adaptive tree tensor network variational method suitable for systems with periodic boundary conditions. We compute the superfluid stiffness and superfluid correlations close to the superfluid to glass transition line, obtaining accurate locations of the critical points.

Complexity of controlling quantum many-body dynamics

Date: 
2014-04-23
Author(s): 

T. Caneva, A. Silva, R. Fazio, S. Lloyd, T. Calarco, and S. Montangero

Reference: 

Journal reference: Phys. Rev. A 89, 042322 (2014)
DOI: http://dx.doi.org/10.1103/PhysRevA.89.042322

We demonstrate that arbitrary time evolutions of many-body quantum systems can be reversed even in cases when only part of the Hamiltonian can be controlled. The reversed dynamics obtained via optimal control --contrary to standard time-reversal procedures-- is extremely robust to external sources of noise.

Limits to catalysis in quantum thermodynamics

Date: 
2014-10-13 - 2014-10-23
Author(s): 

Nelly Huei Ying Ng, Laura Mančinska, Cristina Cirstoiu, Jens Eisert, Stephanie Wehner

Reference: 

arXiv:1405.3039

Equilibration in low-dimensional quantum matrix models

Date: 
2014-03-06 - 2014-10-23
Author(s): 

R. Hübener, Y. Sekino, J. Eisert

Reference: 

arXiv:1403.1392

Generation and confirmation of a (100 × 100)-dimensional entangled quantum system

Date: 
2014-02-24
Author(s): 

Mario Krenn, Marcus Huber, Robert Fickler, Radek Lapkiewicz, Sven Ramelow, Anton Zeilinger

Entangled quantum systems have properties that have fundamentally overthrown the classical worldview. Increasing the complexity of entangled states by expanding their dimensionality allows the implementation of novel fundamental tests of nature, and moreover also enables genuinely new protocols for quantum information processing.

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