Quantum

Paper

Strawberry Fields: A Software Platform for Photonic Quantum Computing

Nathan Killoran, Josh Izaac, Nicolás Quesada, Ville Bergholm, Matthew Amy, and Christian Weedbrook,

Quantum 3, 129 (2019).

We introduce Strawberry Fields, an open-source quantum programming architecture for light-based quantum computers, and detail its key features. Built in Python, Strawberry Fields is a full-s…

Paper

A Game of Surface Codes: Large-Scale Quantum Computing with Lattice Surgery

Daniel Litinski,

Quantum 3, 128 (2019).

Given a quantum gate circuit, how does one execute it in a fault-tolerant architecture with as little overhead as possible? In this paper, we discuss strategies for surface-code quantum comp…

Paper

Work Statistics, Loschmidt Echo and Information Scrambling in Chaotic Quantum Systems

Aurélia Chenu, Javier Molina-Vilaplana, and Adolfo del Campo,

Quantum 3, 127 (2019).

Characterizing the work statistics of driven complex quantum systems is generally challenging because of the exponential growth with the system size of the number of transitions involved bet…

Paper

Minimax quantum state estimation under Bregman divergence

Maria Quadeer, Marco Tomamichel, and Christopher Ferrie,

Quantum 3, 126 (2019).

We investigate minimax estimators for quantum state tomography under general Bregman divergences. First, generalizing the work of Koyama et al. [Entropy 19, 618 (2017)] for relative entropy,…

Paper

Optomechanical state reconstruction and nonclassicality verification beyond the resolved-sideband regime

Farid Shahandeh and Martin Ringbauer,

Quantum 3, 125 (2019).

Quantum optomechanics uses optical means to generate and manipulate quantum states of motion of mechanical resonators. This provides an intriguing platform for the study of fundamental physi…

Paper

Coherent fluctuation relations: from the abstract to the concrete

Zoë Holmes, Sebastian Weidt, David Jennings, Janet Anders, and Florian Mintert,

Quantum 3, 124 (2019).

Recent studies using the quantum information theoretic approach to thermodynamics show that the presence of coherence in quantum systems generates corrections to classical fluctuation theore…

Paper

Optimized Entanglement Purification

Stefan Krastanov, Victor V. Albert, and Liang Jiang,

Quantum 3, 123 (2019).

We investigate novel protocols for entanglement purification of qubit Bell pairs. Employing genetic algorithms for the design of the purification circuit, we obtain shorter circuits achievin…

Paper

An efficient high dimensional quantum Schur transform

Hari Krovi,

Quantum 3, 122 (2019).

The Schur transform is a unitary operator that block diagonalizes the action of the symmetric and unitary groups on an $n$ fold tensor product $V^{\otimes n}$ of a vector space $V$ of dimens…

Paper

Thermodynamics as a Consequence of Information Conservation

Manabendra Nath Bera, Arnau Riera, Maciej Lewenstein, Zahra Baghali Khanian, and Andreas Winter,

Quantum 3, 121 (2019).

Thermodynamics and information have intricate interrelations. Often thermodynamics is considered to be the logical premise to justify that $\textit{information is physical}$ – through Landau…

Paper

Fault-tolerant gates via homological product codes

Tomas Jochym-O’Connor,

Quantum 3, 120 (2019).

A method for the implementation of a universal set of fault-tolerant logical gates is presented using homological product codes. In particular, it is shown that one can fault-tolerantly map…

Paper

On the classification of two-qubit group orbits and the use of coarse-grained ‘shape’ as a superselection property

Thomas Hebdige and David Jennings,

Quantum 3, 119 (2019).

Recently a complete set of entropic conditions has been derived for the interconversion structure of states under quantum operations that respect a specified symmetry action, however the cor…

Paper

All macroscopic quantum states are fragile and hard to prepare

Andrea López-Incera, Pavel Sekatski, and Wolfgang Dür,

Quantum 3, 118 (2019).

We study the effect of local decoherence on arbitrary quantum states. Adapting techniques developed in quantum metrology, we show that the action of generic local noise processes –though ar…

Paper

POVMs are equivalent to projections for perfect state exclusion of three pure states in three dimensions

Abel Molina,

Quantum 3, 117 (2019).

Performing perfect/conclusive quantum state exclusion means to be able to discard with certainty at least one out of $n$ possible quantum state preparations by performing a measurement of th…

Paper

Optimising Matrix Product State Simulations of Shor’s Algorithm

Aidan Dang, Charles D. Hill, and Lloyd C. L. Hollenberg,

Quantum 3, 116 (2019).

We detail techniques to optimise high-level classical simulations of Shor's quantum factoring algorithm. Chief among these is to examine the entangling properties of the circuit and to effec…

Paper

Locally Maximally Entangled States of Multipart Quantum Systems

Jim Bryan, Samuel Leutheusser, Zinovy Reichstein, and Mark Van Raamsdonk,

Quantum 3, 115 (2019).

For a multipart quantum system, a locally maximally entangled (LME) state is one where each elementary subsystem is maximally entangled with its complement. This paper is a sequel to~[J. Bry…

Paper

Exact Ising model simulation on a quantum computer

Alba Cervera-Lierta,

Quantum 2, 114 (2018).

We present an exact simulation of a one-dimensional transverse Ising spin chain with a quantum computer. We construct an efficient quantum circuit that diagonalizes the Ising Hamiltonian and…

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