Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Quantum Correlations in Nonlocal BosonSampling
F. Shahandeh, A. Lund, T. Ralph·Feb 7, 2017
Determination of the quantum nature of correlations between two spatially separated systems plays a crucial role in quantum information science. Of particular interest is the questions of if and how these correlations enable quantum information proto...
Quantum algorithms for computing short discrete logarithms and factoring RSA integers
Martin Ekerå, J. Håstad·Feb 1, 2017
We generalize the quantum algorithm for computing short discrete logarithms previously introduced by Ekera [2] so as to allow for various tradeoffs between the number of times that the algorithm need be executed on the one hand, and the complexity of...
Experimental protection of arbitrary states in a two-qubit subspace by nested Uhrig dynamical decoupling
Harpreet Singh, Arvind, K. Dorai·Jan 28, 2017
We experimentally demonstrate the efficacy of a three-layer nested Uhrig dynamical decoupling (NUDD) sequence to preserve arbitrary quantum states in a two-dimensional subspace of the four-dimensional two-qubit Hilbert space, on an NMR quantum inform...
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...
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...
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...
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...
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...
Strong coupling of a single electron in silicon to a microwave photon
Xiao Mi, J. Cady, D. M. Zajac +2 more·Jan 13, 2017
Inducing strong coupling Quantum dots, or artificial atoms, are being pursued as prospective building blocks for quantum information processing architectures. Communication with other, distant quantum dots requires strong coupling between photons and...
Fast Reconstruction of High-qubit Quantum States via Low Rate Measurements
Kezhi Li, J. Zhang, S. Cong·Jan 13, 2017
Quantum state tomography is a fundamental technique for quantum technology, with many applications in quantum control and quantum communication. Due to the exponential complexity of the resources required for QST, people are looking for approaches th...
A practical efficient and effective method for the Hamiltonian cycle problem that runs on a standard computer
E. Altschuler, T. Williams·Jan 11, 2017
Given $N$ cities and $R < N^2 - N$ directed (unidirectional/one way) roads does there exist a tour of all $N$ cities stopping at each city exactly once using the given roads (a Hamiltonian cycle)? This Hamiltonian cycle problem (HCP) is an NP-complet...
Geometric algebra and information geometry for quantum computational software
C. Cafaro·Jan 10, 2017
The art of quantum algorithm design is highly nontrivial. Grover’s search algorithm constitutes a masterpiece of quantum computational software. In this article, we use methods of geometric algebra (GA) and information geometry (IG) to enhance the al...
Enhancing quantum control by bootstrapping a quantum processor of 12 qubits
Dawei Lu, Keren Li, Jun Li +10 more·Jan 5, 2017
Accurate and efficient control of quantum systems is one of the central challenges for quantum information processing. Current state-of-the-art experiments rarely go beyond 10 qubits and in most cases demonstrate only limited control. Here we demonst...
Coherent long-distance displacement of individual electron spins
H. Flentje, H. Flentje, P. Mortemousque +9 more·Jan 5, 2017
Controlling nanocircuits at the single electron spin level is a possible route for large-scale quantum information processing. In this context, individual electron spins have been identified as versatile quantum information carriers to interconnect d...
Entanglement renormalization, quantum error correction, and bulk causality
Isaac H. Kim, M. Kastoryano·Dec 31, 2016
Entanglement renormalization can be viewed as an encoding circuit for a family of approximate quantum error correcting codes. The logical information becomes progres-sively more well-protected against erasure errors at larger length scales. In partic...
Construction of optimal resources for concatenated quantum protocols
A. Pirker, Julius Wallnofer, H. Briegel +1 more·Dec 30, 2016
We present a general framework for the explicit construction of resource states for measurement-based quantum information processing. In particular, we show how to obtain resource states of minimal size for complex tasks that are combinations or conc...
Solutions to the mean king's problem: higher-dimensional quantum error-correcting codes
Masakazu Yoshida, Toru Kuriyama, Jun Cheng·Dec 27, 2016
Mean king's problem is a kind of quantum state discrimination problems. In the problem, we try to discriminate eigenstates of noncommutative observables with the help of classical delayed information. The problem has been investigated from the viewpo...
Suppressing relaxation in superconducting qubits by quasiparticle pumping
S. Gustavsson, F. Yan, G. Catelani +15 more·Dec 23, 2016
Extending qubit lifetime through a shaped environment Qubits are the quantum two-level systems that encode and process information in quantum computing. Kept in isolation, qubits can be stable. In a practical setting, however, qubits must be addresse...
Asynchronous Operations on Qubits in Distributed Simulation Environments using QooSim
J. J. vanBrandwijk, A. Parakh·Dec 22, 2016
Operations on a pair of entangled qubits are conventionally presented as the application of the tensor product of operations. The tensor product is linearly extended to act synchronously across the entire entangled system. When simulating an entangle...