Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Implementations of two-photon four-qubit Toffoli and Fredkin gates assisted by nitrogen-vacancy centers
Hai‐Rui Wei, Pei Zhu·Oct 24, 2016
It is desirable to implement an efficient quantum information process demanding fewer quantum resources. We designed two compact quantum circuits for determinately implementing four-qubit Toffoli and Fredkin gates on single-photon systems in both the...
Limits on the storage of quantum information in a volume of space
S. Flammia, Jeongwan Haah, M. Kastoryano +1 more·Oct 19, 2016
We study the fundamental limits on the reliable storage of quantum information in lattices of qubits by deriving tradeoff bounds for approximate quantum error correcting codes. We introduce a notion of local approximate correctability and code distan...
Fidelity as a figure of merit in quantum error correction
J. Almlof, G. Bjork·Oct 12, 2016
We discuss the fidelity as a figure of merit in quantum error correction schemes. We show that when identifiable but uncorrectable errors occur as a result of the action of the channel, a common strategy that improves the fidelity actually decreases ...
Noise Threshold of Quantum Supremacy
K. Fujii·Oct 12, 2016
Demonstrating quantum supremacy, a complexity-guaranteed quantum advantage against over the best classical algorithms by using less universal quantum devices, is an important near-term milestone for quantum information processing. Here we develop a t...
Hybrid quantum gate and entanglement between a "stationary" photonic qubit and a flying optical state via a giant cross Kerr nonlinear effect
K. Xia, J. Twamley·Oct 11, 2016
Quantum information processing with hybrid protocols making use of discrete- and continuous-variable currently attracts of great interest because of its promising applications in scalable quantum computer and distant quantum network. By inducing a gi...
Entanglement detection on an NMR quantum-information processor using random local measurements
Amandeep Singh, Arvind, K. Dorai·Oct 8, 2016
Random local measurements have recently been proposed to construct entanglement witnesses and thereby detect the presence of bipartite entanglement. We experimentally demonstrate the efficacy of one such scheme on a two-qubit NMR quantum information ...
Quantum information processing with superconducting circuits: a review
G. Wendin·Oct 7, 2016
During the last ten years, superconducting circuits have passed from being interesting physical devices to becoming contenders for near-future useful and scalable quantum information processing (QIP). Advanced quantum simulation experiments have been...
Resolving quanta of collective spin excitations in a millimeter-sized ferromagnet
D. Lachance-Quirion, Y. Tabuchi, Seiichiro Ishino +4 more·Oct 4, 2016
Quanta of collective spin excitations are observed in a ferromagnet by measurements of a superconducting quantum bit. Combining different physical systems in hybrid quantum circuits opens up novel possibilities for quantum technologies. In quantum ma...
Generating entangled quantum microwaves in a Josephson-photonics device
S. Dambach, B. Kubala, J. Ankerhold·Sep 28, 2016
When connecting a voltage-biased Josephson junction in series to several microwave cavities, a Cooper-pair current across the junction gives rise to a continuous emission of strongly correlated photons into the cavity modes. Tuning the bias voltage t...
Distinguishing quantum states using Clifford orbits
R. Kueng, Huangjun Zhu, D. Gross·Sep 27, 2016
It is a fundamental property of quantum mechanics that information is lost as a result of performing measurements. Indeed, with every quantum measurement one can associate a number -- its POVM norm constant -- that quantifies how much the distinguish...
Fault-tolerant interface between quantum memories and quantum processors
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...
The Clifford group fails gracefully to be a unitary 4-design
Huangjun Zhu, R. Kueng, M. Grassl +1 more·Sep 26, 2016
A unitary t-design is a set of unitaries that is "evenly distributed" in the sense that the average of any t-th order polynomial over the design equals the average over the entire unitary group. In various fields -- e.g. quantum information theory --...
Demonstrating non-Abelian braiding of surface code defects in a five qubit experiment
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 ...
From Digital computers to quantum computers based on biological paradigms and progress in particle physics
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...
Measurement based quantum communication with resource states generated by entanglement purification
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...
Convex separation from convex optimization for large-scale problems
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...
A Generalization of Bernstein-Vazirani Algorithm to Qudit Systems
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...
Quantum optical circulator controlled by a single chirally coupled atom
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...
Quantum one-way permutation over the finite field of two elements
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...
Wire recycling for quantum circuit optimization
A. Paler, R. Wille, S. Devitt·Sep 3, 2016
Quantum information processing is expressed using quantum bits (qubits) and quantum gates which are arranged in the terms of quantum circuits. Here, each qubit is associated to a quantum circuit wire which is used to conduct the desired operations. M...