Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Tapering off qubits to simulate fermionic Hamiltonians
S. Bravyi, J. Gambetta, Antonio Mezzacapo +1 more·Jan 27, 2017
We discuss encodings of fermionic many-body systems by qubits in the presence of symmetries. Such encodings eliminate redundant degrees of freedom in a way that preserves a simple structure of the system Hamiltonian enabling quantum simulations with ...
Mølmer–Sørensen entangling gate for cavity QED systems
Hiroki Takahashi, Pedro Nevado, M. Keller·Jan 26, 2017
The Mølmer–Sørensen gate is a state-of-the-art entangling gate in ion trap quantum computing where the gate fidelity can exceed 99%. Here we propose an analogous implementation in the setting of cavity QED. The cavity photon mode acts as the bosonic ...
Quantum dark solitons as qubits in Bose-Einstein condensates
M. I. Shaukat, E. Castro, H. Terccas·Jan 26, 2017
We study the possibility of using dark soliton in quasi one dimensional Bose Einstein condensates to produce two level system (qubits) by exploiting the intrinsic nonlinear and the coherent nature of the matter waves. We calculate the soliton spectru...
Non-stoquastic Hamiltonians in quantum annealing via geometric phases
W. Vinci, Daniel A. Lidar·Jan 25, 2017
We argue that a complete description of quantum annealing implemented with continuous variables must take into account the non-adiabatic Aharonov-Anandan geometric phase that arises when the system Hamiltonian changes during the anneal. We show that ...
Ultralow 1/f Noise in a Heterostructure of Superconducting Epitaxial Cobalt Disilicide Thin Film on Silicon.
S. Chiu, S. Yeh, Chien-Jyun Chiou +3 more·Jan 24, 2017
High-precision resistance noise measurements indicate that the epitaxial CoSi2/Si heterostructures at 150 and 2 K (slightly above its superconducting transition temperature Tc of 1.54 K) exhibit an unusually low 1/f noise level in the frequency range...
Electrically driving nuclear spin qubits with microwave photonic bangap resonators
A. Sigillito, A. Tyryshkin, T. Schenkel +2 more·Jan 23, 2017
The electronic and nuclear spin degrees of freedom for donor impurities in semiconductors form ultra coherent two-level systems that are useful for quantum information applications. Spins naturally have magnetic dipoles, so alternating current (AC) m...
Quantum entanglement, sum of squares, and the log rank conjecture
B. Barak, Pravesh Kothari, David Steurer·Jan 23, 2017
For every constant ε>0, we give an exp(Õ(∞n))-time algorithm for the 1 vs 1 - ε Best Separable State (BSS) problem of distinguishing, given an n2 x n2 matrix ℳ corresponding to a quantum measurement, between the case that there is a separable (i.e., ...
Physics Without Physics
G. D’Ariano·Jan 23, 2017
David Finkelstein was very fond of the new information-theoretic paradigm of physics advocated by John Archibald Wheeler and Richard Feynman. Only recently, however, the paradigm has concretely shown its full power, with the derivation of quantum the...
Verified measurement-based quantum computing with hypergraph states
T. Morimae, Yuki Takeuchi, Masahito Hayashi·Jan 20, 2017
Hypergraph states are generalizations of graph states where controlled-$Z$ gates on edges are replaced with generalized controlled-$Z$ gates on hyperedges. Hypergraph states have several advantages over graph states. For example, certain hypergraph s...
Computing with a single qubit faster than the computation quantum speed limit
N. A. Sinitsyn·Jan 19, 2017
Abstract The possibility to save and process information in fundamentally indistinguishable states is the quantum mechanical resource that is not encountered in classical computing. I demonstrate that, if energy constraints are imposed, this resource...
Adiabatic quantum computing solution of the knapsack problem
M. Coffey·Jan 19, 2017
We illustrate the adiabatic quantum computing solution of the knapsack problem with both integer profits and weights. For problems with $n$ objects (or items) and integer capacity $c$, we give specific examples using both an Ising class problem Hamil...
Basic protocols in quantum reinforcement learning with superconducting circuits
L. Lamata·Jan 18, 2017
Superconducting circuit technologies have recently achieved quantum protocols involving closed feedback loops. Quantum artificial intelligence and quantum machine learning are emerging fields inside quantum technologies which may enable quantum devic...
Universal quantum Hamiltonians
T. Cubitt, A. Montanaro, Stephen Piddock·Jan 18, 2017
Significance Quantum many-body systems exhibit a bewilderingly diverse range of behavior, which forms the central object of study in many areas of physics and beyond. Our work reveals that, in fact, the entire physics of every other quantum many-body...
Dynamics of the quantum search and quench-induced first-order phase transitions.
Ivan B. Coulamy, A. Saguia, M. S. Sarandy·Jan 18, 2017
We investigate the excitation dynamics at a first-order quantum phase transition (QPT). More specifically, we consider the quench-induced QPT in the quantum search algorithm, which aims at finding out a marked element in an unstructured list. We begi...
The network impact of hijacking a quantum repeater
Takahiko Satoh, Shota Nagayama, Takafumi Oka +1 more·Jan 17, 2017
In quantum networking, repeater hijacking menaces the security and utility of quantum applications. To deal with this problem, it is important to take a measure of the impact of quantum repeater hijacking. First, we quantify the work of each quantum ...
Equivalence of restricted Boltzmann machines and tensor network states
J. Chen, Song Cheng, Haidong Xie +2 more·Jan 17, 2017
The restricted Boltzmann machine (RBM) is one of the fundamental building blocks of deep learning. RBM finds wide applications in dimensional reduction, feature extraction, and recommender systems via modeling the probability distributions of a varie...
Optimizing Timing of High-Success-Probability Quantum Repeaters
R. V. Meter, Takahiko Satoh, Shota Nagayama +2 more·Jan 17, 2017
Optimizing a connection through a quantum repeater network requires careful attention to the photon propagation direction of the individual links, the arrangement of those links into a path, the error management mechanism chosen, and the application'...
Resource-aware system architecture model for implementation of quantum aided Byzantine agreement on quantum repeater networks
Mohammand Amin Taherkhani, Keivan Navi, R. V. Meter·Jan 17, 2017
Quantum aided Byzantine agreement is an important distributed quantum algorithm with unique features in comparison to classical deterministic and randomized algorithms, requiring only a constant expected number of rounds in addition to giving a highe...
Optimizing squeezing in a coherent quantum feedback network of optical parametric oscillators
C. Brif, M. Sarovar, D. Soh +2 more·Jan 16, 2017
Advances in the emerging field of coherent quantum feedback control (CQFC) have led to the development of new capabilities in the areas of quantum control and quantum engineering, with a particular impact on the theory and applications of quantum opt...
Optimal Quantum Spatial Search on Random Temporal Networks.
Shantanav Chakraborty, Leonardo Novo, Serena Di Giorgio +1 more·Jan 16, 2017
To investigate the performance of quantum information tasks on networks whose topology changes in time, we study the spatial search algorithm by continuous time quantum walk to find a marked node on a random temporal network. We consider a network of...