Quantum

Paper

On Formalisms and Interpretations

Veronika Baumann and Stefan Wolf,

Quantum 2, 99 (2018).

One of the reasons for the heated debates around the interpretations of quantum theory is a simple confusion between the notions of formalism $\textit{versus}$ interpretation. In this note,…

Paper

Time-reversal of rank-one quantum strategy functions

Yuan Su and John Watrous,

Quantum 2, 98 (2018).

The $\textit{quantum strategy}$ (or $\textit{quantum combs}$) framework is a useful tool for reasoning about interactions among entities that process and exchange quantum information over th…

Paper

Non-Markovian Quantum Optics with Three-Dimensional State-Dependent Optical Lattices

A. González-Tudela and J. I. Cirac,

Quantum 2, 97 (2018).

Quantum emitters coupled to structured photonic reservoirs experience unconventional individual and collective dynamics emerging from the interplay between dimensionality and non-trivial pho…

Paper

Distinguishability times and asymmetry monotone-based quantum speed limits in the Bloch ball

T.J. Volkoff and K.B. Whaley,

Quantum 2, 96 (2018).

For both unitary and open qubit dynamics, we compare asymmetry monotone-based bounds on the minimal time required for an initial qubit state to evolve to a final qubit state from which it is…

Paper

Complete homotopy invariants for translation invariant symmetric quantum walks on a chain

C. Cedzich, T. Geib, C. Stahl, L. Velázquez, A. H. Werner, and R. F. Werner,

Quantum 2, 95 (2018).

We provide a classification of translation invariant one-dimensional quantum walks with respect to continuous deformations preserving unitarity, locality, translation invariance, a gap condi…

Paper

Analysis and limitations of modified circuit-to-Hamiltonian constructions

Johannes Bausch and Elizabeth Crosson,

Quantum 2, 94 (2018).

Feynman's circuit-to-Hamiltonian construction connects quantum computation and ground states of many-body quantum systems. Kitaev applied this construction to demonstrate QMA-completeness of…

Paper

Quantum repeaters with individual rare-earth ions at telecommunication wavelengths

F. Kimiaee Asadi, N. Lauk, S. Wein, N. Sinclair, C. O’Brien, and C. Simon,

Quantum 2, 93 (2018).

We present a quantum repeater scheme that is based on individual erbium and europium ions. Erbium ions are attractive because they emit photons at telecommunication wavelength, while europiu…

Paper

Test for a large amount of entanglement, using few measurements

Rui Chao, Ben W. Reichardt, Chris Sutherland, and Thomas Vidick,

Quantum 2, 92 (2018).

Bell-inequality violations establish that two systems share some quantum entanglement. We give a simple test to certify that two systems share an asymptotically large amount of entanglement,…

Paper

Electro-mechanical Casimir effect

Mikel Sanz, Witlef Wieczorek, Simon Gröblacher, and Enrique Solano,

Quantum 2, 91 (2018).

The dynamical Casimir effect is an intriguing phenomenon in which photons are generated from vacuum due to a non-adiabatic change in some boundary conditions. In particular, it connects the…

Paper

Experimental quantification of spatial correlations in quantum dynamics

Lukas Postler, Ángel Rivas, Philipp Schindler, Alexander Erhard, Roman Stricker, Daniel Nigg, Thomas Monz, Rainer Blatt, and Markus Müller,

Quantum 2, 90 (2018).

Correlations between different partitions of quantum systems play a central role in a variety of many-body quantum systems, and they have been studied exhaustively in experimental and theore…

Paper

Fidelity of quantum strategies with applications to cryptography

Gus Gutoski, Ansis Rosmanis, and Jamie Sikora,

Quantum 2, 89 (2018).

We introduce a definition of the fidelity function for multi-round quantum strategies, which we call the $\textit{strategy fidelity}$, that is a generalization of the fidelity function for q…

Paper

Modeling noise and error correction for Majorana-based quantum computing

Christina Knapp, Michael Beverland, Dmitry I. Pikulin, and Torsten Karzig,

Quantum 2, 88 (2018).

Majorana-based quantum computing seeks to use the non-local nature of Majorana zero modes to store and manipulate quantum information in a topologically protected way. While noise is anticip…

Paper

Almost Quantum Correlations are Inconsistent with Specker’s Principle

Tomáš Gonda, Ravi Kunjwal, David Schmid, Elie Wolfe, and Ana Belén Sainz,

Quantum 2, 87 (2018).

Ernst Specker considered a particular feature of quantum theory to be especially fundamental, namely that pairwise joint measurability of sharp measurements implies their global joint measur…

Paper

Device-independent randomness generation with sublinear shared quantum resources

Cédric Bamps, Serge Massar, and Stefano Pironio,

Quantum 2, 86 (2018).

In quantum cryptography, device-independent (DI) protocols can be certified secure without requiring assumptions about the inner workings of the devices used to perform the protocol. In orde…

Paper

Real Randomized Benchmarking

A. K. Hashagen, S. T. Flammia, D. Gross, and J. J. Wallman,

Quantum 2, 85 (2018).

Randomized benchmarking provides a tool for obtaining precise quantitative estimates of the average error rate of a physical quantum channel. Here we define real randomized benchmarking, whi…

Paper

Quantum walking in curved spacetime: discrete metric

Pablo Arrighi, Giuseppe Di Molfetta, and Stefano Facchini,

Quantum 2, 84 (2018).

A discrete-time quantum walk (QW) is essentially a unitary operator driving the evolution of a single particle on the lattice. Some QWs have familiar physics PDEs as their continuum limit. S…

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