Archives: Paper

Wolfgang Niedenzu, Marcus Huber, and Erez Boukobza,

Quantum 3, 195 (2019).

One of the fundamental questions in quantum thermodynamics concerns the decomposition of energetic changes into heat and work. Contrary to classical engines, the entropy change of the piston…

Alastair A. Abbott, Ralph Silva, Julian Wechs, Nicolas Brunner, and Cyril Branciard,

Quantum 3, 194 (2019).

A weak measurement performed on a pre- and post-selected quantum system can result in an average value that lies outside of the observable's spectrum. This effect, usually referred to as an…

Fabian Laudenbach, Bernhard Schrenk, Christoph Pacher, Michael Hentschel, Chi-Hang Fred Fung, Fotini Karinou, Andreas Poppe, Momtchil Peev, and Hannes Hübel,

Quantum 3, 193 (2019).

We present a pilot-assisted coherent intradyne reception methodology for CV-QKD with true local oscillator. An optically phase-locked reference tone, prepared using carrier-suppressed optica…

Prahlad Warszawski and Howard M. Wiseman,

Quantum 3, 192 (2019).

For a Markovian (in the strongest sense) open quantum system it is possible, by continuously monitoring the environment, to perfectly track the system; that is, to know the stochastically ev…

Xiao Yuan, Suguru Endo, Qi Zhao, Ying Li, and Simon C. Benjamin,

Quantum 3, 191 (2019).

The variational method is a versatile tool for classical simulation of a variety of quantum systems. Great efforts have recently been devoted to its extension to quantum computing for effici…

Sevag Gharibian and Justin Yirka,

Quantum 3, 189 (2019).

An important task in quantum physics is the estimation of local quantities for ground states of local Hamiltonians. Recently, [Ambainis, CCC 2014] defined the complexity class ${P}^{{QMA}[{log}]}$…

Álvaro M. Alhambra, Matteo Lostaglio, and Christopher Perry,

Quantum 3, 188 (2019).

Heat-Bath Algorithmic Cooling is a set of techniques for producing highly pure quantum systems by utilizing a surrounding heat-bath and unitary interactions. These techniques originally used…

Alexander M. Dalzell and Fernando G. S. L. Brandão,

Quantum 3, 187 (2019).

A key feature of ground states of gapped local 1D Hamiltonians is their relatively low entanglement — they are well approximated by matrix product states (MPS) with bond dimension scaling…

Manik Banik, Some Sankar Bhattacharya, Nirman Ganguly, Tamal Guha, Amit Mukherjee, Ashutosh Rai, and Arup Roy,

Quantum 3, 185 (2019).

Entanglement is of paramount importance in quantum information theory. Its supremacy over classical correlations has been demonstrated in a numerous information theoretic protocols. Here we…

Ravi Kunjwal,

Quantum 3, 184 (2019).

We develop a hypergraph-theoretic framework for Spekkens contextuality applied to Kochen-Specker (KS) type scenarios that goes beyond the Cabello-Severini-Winter (CSW) framework. To do this,…

Philip Andreasson, Joel Johansson, Simon Liljestrand, and Mats Granath,

Quantum 3, 183 (2019).

We implement a quantum error correction algorithm for bit-flip errors on the topological toric code using deep reinforcement learning. An action-value Q-function encodes the discounted value…

Andrew M. Childs, Aaron Ostrander, and Yuan Su,

Quantum 3, 182 (2019).

Product formulas can be used to simulate Hamiltonian dynamics on a quantum computer by approximating the exponential of a sum of operators by a product of exponentials of the individual summ…

Ali Lavasani, Guanyu Zhu, and Maissam Barkeshli,

Quantum 3, 180 (2019).

A basic question in the theory of fault-tolerant quantum computation is to understand the fundamental resource costs for performing a universal logical set of gates on encoded qubits to arbi…