Papers

Hendrik Poulsen Nautrup, N. Friis, H. Briegel·Sep 26, 2016

Topological error correction codes are promising candidates to protect quantum computations from the deteriorating effects of noise. While some codes provide high noise thresholds suitable for robust quantum memories, others allow straightforward gat...

Jiangwei Shang, Zhengyun Zhang, H. Ng·Sep 26, 2016

Conventional methods for computing maximum-likelihood estimators (MLE) often converge slowly in practical situations, leading to a search for simplifying methods that rely on additional assumptions for their validity. In this work, we provide a fast ...

James R. Wootton·Sep 25, 2016

Currently, the mainstream approach to quantum computing is through surface codes. One way to store and manipulate quantum information with these to create defects in the codes which can be moved and used as if they were particles. Specifically, they ...

P. Borza, L. Pau·Sep 24, 2016

While several paths have emerged in microelectronics and computing as follow-ons to Turing architectures, and have been implemented using essentially silicon circuits, very little beyond Moore research has considered: (1) first biological processes i...

C. Chamberland, Tomas Jochym-O'Connor, R. Laflamme·Sep 23, 2016

We analyze the resource overhead of recently proposed methods for universal fault-tolerant quantum computation using concatenated codes. Namely, we examine the concatenation of the 7-qubit Steane code with the 15-qubit Reed-Muller code, which allows ...

C. Gonçalves·Sep 22, 2016

The current work addresses quantum machine learning in the context of Quantum Artificial Neural Networks such that the networks' processing is divided in two stages: the learning stage, where the network converges to a specific quantum circuit, and t...

Y. Nakata, Christoph Hirche, M. Koashi +1 more·Sep 22, 2016

We provide new constructions of unitary $t$-designs for general $t$ on one qudit and $N$ qubits, and propose a design Hamiltonian, a random Hamiltonian of which dynamics always forms a unitary design after a threshold time, as a basic framework to in...

Kais Abdelkhalek, Y. Nakata, David Reeb·Sep 22, 2016

Measurements and feedback are essential in the control of any device operating at the quantum scale and exploiting the features of quantum physics. As the number of quantum components grows, it becomes imperative to consider the energetic expense of ...

J. Bartel, R. K. Bhaduri, M. Brack +1 more·Sep 21, 2016

In this paper, we discuss P(n), the number of ways a given integer n may be written as a sum of primes. In particular, an asymptotic form P_{as}(n) valid for n→∞ is obtained analytically using standard techniques of quantum statistical mechanics. Fir...

B. Heim, K. Svore, M. Hastings·Sep 20, 2016

Surface codes exploit topological protection to increase error resilience in quantum computing devices and can in principle be implemented in existing hardware. They are one of the most promising candidates for active error correction, not least due ...

Julius Wallnofer, W. Dur·Sep 19, 2016

We investigate measurement-based quantum communication with noisy resource states that are generated by entanglement purification. We consider the transmission of encoded information via noisy quantum channels using a measurement-based implementation...

N. Chancellor·Sep 19, 2016

Quantum annealing, a method of computing where optimization and machine learning problems are mapped to physically implemented energy landscapes subject to quantum fluctuations, allows for these fluctuations to be used to assist in finding the soluti...

S. Brierley, M. Navascués, T. Vértesi·Sep 16, 2016

We present a scheme, based on Gilbert's algorithm for quadratic minimization [SIAM J. Contrl., vol. 4, pp. 61-80, 1966], to prove separation between a point and an arbitrary convex set $S\subset\mathbb{R}^{n}$ via calls to an oracle able to perform l...

E. Brehm, B. Richter·Sep 12, 2016

In this work, we introduce classical holographic codes. These can be understood as concatenated probabilistic codes and can be represented as networks uniformly covering hyperbolic space. In particular, classical holographic codes can be interpreted ...

R. Krishna, V. Makwana, Ananda Padhmanabhan Suresh·Sep 11, 2016

A quantum algorithm to solve the parity problem is better than its most efficient classical counter- part with a separation that is polynomial in the number of queries. This was shown by E. Bernstein and U. Vazirani and was one of the earliest indica...

J. Ikonen, J. Salmilehto, M. Möttönen·Sep 9, 2016

In the near future, one of the major challenges in the realization of large-scale quantum computers operating at low temperatures is the management of harmful heat loads owing to thermal conduction of cabling and dissipation at cryogenic components. ...

J. Volz, M. Scheucher, A. Hilico +2 more·Sep 8, 2016

A quantum optical circulator A circulator is a passive three- or four-port device that routes signals according to a simple protocol: If the ports are numbered in ascending order, a signal that enters the circulator through port 1, 2, 3, or 4 exits i...

David Viennot, Olivia Moro·Sep 6, 2016

We consider localized qubits evolving around a black hole following a quantum adiabatic dynamics. We develop a geometric structure (based on fibre bundles) permitting to describe the quantum states of a qubit and the spacetime geometry in a single fr...

A. D. Castro·Sep 5, 2016

In quantum cryptography, a one-way permutation is a bounded unitary operator U:H→H\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage...

Weidong Tang, Si-Xia Yu·Sep 5, 2016

Fast quantum data transmission faces several shortcomings such as the indistinguishability of some partly overlapping signals, the channel noises, and so on. Based on the encoded quantum data transmission protocol, an unconventional scheme is present...