Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Local Pauli stabilizers of symmetric hypergraph states
David W. Lyons, Nathaniel P Gibbons, Mark A. Peters +3 more·Sep 5, 2016
Hypergraph states of many quantum bits share the rich interplay between simple combinatorial description and nontrivial entanglement properties enjoyed by the graph states that they generalize. In this paper, we consider hypergraph states that are al...
Pushing the Qubit Rate Limit for Fast Quantum Data Transmission by Quantum Error Correction
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...
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...
Finding resource states of measurement-based quantum computing is harder than quantum computing
T. Morimae·Sep 2, 2016
Measurement-based quantum computing enables universal quantum computing with only adaptive single-qubit measurements on certain many-qubit states, such as the graph state, the Affleck-Kennedy-Lieb-Tasaki (AKLT) state, and several tensor-network state...
Observation of ten-photon entanglement using thin BiB 3 O 6 crystals
Luo-Kan Chen, Zheng-da Li, Xing-Can Yao +13 more·Sep 1, 2016
Coherently manipulating a number of entangled qubits is the key task of quantum information processing. In this paper, we report on the experimental realization of a ten-photon Greenberger–Horne–Zeilinger state using thin BiB3O6 crystals. The observe...
Quantum protocols within Spekkens' toy model
Leonardo Disilvestro, D. Markham·Aug 31, 2016
Quantum mechanics is known to provide significant improvements in information processing tasks when compared to classical models. These advantages range from computational speeds-up to security improvements. A key question is where these advantages c...
High-Threshold Low-Overhead Fault-Tolerant Classical Computation and the Replacement of Measurements with Unitary Quantum Gates.
Benjamin Cruikshank, K. Jacobs·Aug 29, 2016
von Neumann's classic "multiplexing" method is unique in achieving high-threshold fault-tolerant classical computation (FTCC), but has several significant barriers to implementation: (i) the extremely complex circuits required by randomized connectio...
Ultracold few fermionic atoms in needle-shaped double wells: spin chains and resonating spin clusters from microscopic Hamiltonians emulated via antiferromagnetic Heisenberg and t–J models
C. Yannouleas, B. B. Brandt, U. Landman·Aug 29, 2016
Advances with trapped ultracold atoms intensified interest in simulating complex physical phenomena, including quantum magnetism and transitions from itinerant to non-itinerant behavior. Here we show formation of antiferromagnetic ground states of fe...
Higher-order spin and charge dynamics in a quantum dot-lead hybrid system
T. Otsuka, T. Nakajima, M. Delbecq +11 more·Aug 27, 2016
Understanding the dynamics of open quantum systems is important and challenging in basic physics and applications for quantum devices and quantum computing. Semiconductor quantum dots offer a good platform to explore the physics of open quantum syste...
Shallow Quantum Circuits with Uninitialized Ancillary Qubits
Y. Takahashi, S. Tani·Aug 25, 2016
We study the computational power of shallow quantum circuits with $n$ input qubits, one output qubit, and two types of ancillary qubits: $O(\log n)$ initialized and $n^{O(1)}$ uninitialized qubits. The initial state of the uninitialized ancillary qub...
Probability distributions of continuous measurement results for conditioned quantum evolution
A. Franquet, Y. Nazarov·Aug 24, 2016
We address the statistics of continuous weak linear measurement on a few-state quantum system that is subject to a conditioned quantum evolution. For a conditioned evolution, both the initial and final states of the system are fixed: the latter is ac...
Quantum dynamics of simultaneously measured non-commuting observables
S. Hacohen-Gourgy, Leigh S. Martin, E. Flurin +3 more·Aug 23, 2016
In quantum mechanics, measurements cause wavefunction collapse that yields precise outcomes, whereas for non-commuting observables such as position and momentum Heisenberg’s uncertainty principle limits the intrinsic precision of a state. Although th...
Logical Qubit in a Linear Array of Semiconductor Quantum Dots
Cody Jones, M. Fogarty, A. Morello +3 more·Aug 22, 2016
We design and analyze a logical qubit composed of a linear array of electron spins in semiconductor quantum dots. To avoid the difficulty of fully controlling a two-dimensional array of dots, we adapt spin control and error correction to a one-dimens...
Lattice surgery translation for quantum computation
Daniel Herr, F. Nori, S. Devitt·Aug 18, 2016
In this paper we outline a method for a compiler to translate any non fault tolerant quantum circuit to the geometric representation of the lattice surgery error-correcting code using inherent merge and split operations. Since the efficiency of state...
Proposal for a minimal surface code experiment
James R. Wootton, Andreas Peter, J. R. Winkler +1 more·Aug 17, 2016
Current quantum technology is approaching the system sizes and fidelities required for quantum error correction. It is therefore important to determine exactly what is needed for proof-of-principle experiments, which will be a major step towards faul...
Quantum Merlin-Arthur with noisy channel
T. Morimae, K. Fujii, H. Nishimura·Aug 17, 2016
What happens if in QMA the quantum channel between Merlin and Arthur is noisy? It is not difficult to show that such a modification does not change the computational power as long as the noise is not too strong so that errors are correctable with hig...
Matrix quantum mechanics from qubits
S. Hartnoll, L. Huijse, Edward A. Mazenc·Aug 17, 2016
A bstractWe introduce a transverse field Ising model with order N2 spins interacting via a nonlocal quartic interaction. The model has an O(N, ℤ), hyperoctahedral, symmetry. We show that the large N partition function admits a saddle point in which t...
Exploring Quantum Teleportation through Unitary Error Bases
Benjamin Musto·Aug 16, 2016
Unitary error bases have a great number of applications across quantum information and quantum computation, and are fundamentally linked to quantum teleportation, dense coding and quantum error correction. Werner's combinatorial construction builds a...
High-fidelity entangling gate for double-quantum-dot spin qubits
J. Nichol, L. Orona, S. Harvey +4 more·Aug 15, 2016
Electron spins in semiconductors are promising qubits because their long coherence times enable nearly 109 coherent quantum gate operations. However, developing a scalable high-fidelity two-qubit gate remains challenging. Here, we demonstrate an enta...
Hyper-parallel Toffoli gate on three-photon system with two degrees of freedom assisted by single-sided optical microcavities.
Hai‐Rui Wei, Fuguo Deng, G. Long·Aug 8, 2016
Encoding qubits in multiple degrees of freedom (DOFs) of a quantum system allows less-decoherence quantum information processing with much less quantum resources. We present a compact and scalable quantum circuit to determinately implement a hyper-pa...