Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Advanced capabilities for materials modelling with Quantum ESPRESSO
P. Giannozzi, O. Andreussi, T. Brumme +47 more·Sep 28, 2017
Quantum ESPRESSO is an integrated suite of open-source computer codes for quantum simulations of materials using state-of-the-art electronic-structure techniques, based on density-functional theory, density-functional perturbation theory, and many-bo...
Categorical quantum dynamics
S. Gogioso·Sep 28, 2017
We use strong complementarity to introduce dynamics and symmetries within the framework of CQM, which we also extend to infinite-dimensional separable Hilbert spaces: these were long-missing features, which open the way to a wealth of new application...
Remote quantum clock synchronization without synchronized clocks
E. Ilo-Okeke, Louis Tessler, J. Dowling +1 more·Sep 25, 2017
A major outstanding problem for many quantum clock synchronization protocols is the hidden assumption of a common phase reference between the parties to be synchronized. In general, the definition of the quantum states between two parties do not have...
The Road to Quantum Computational Supremacy
Cristian S. Calude, E. Calude·Sep 25, 2017
We present an idiosyncratic view of the race for quantum computational supremacy. Google's approach and IBM challenge are examined. An unexpected side-effect of the race is the significant progress in designing fast classical algorithms. Quantum supr...
Quantum interface between a transmon qubit and spins of nitrogen-vacancy centers
Yao-Wen Hu, Yipu Song, L. Duan·Sep 25, 2017
Hybrid quantum circuits combining advantages of each individual system have provided a promising platform for quantum information processing. Here we propose an experimental scheme to directly couple a transmon qubit to an individual spin in the nitr...
Enhanced Quantum Synchronization via Quantum Machine Learning
F. A. Cárdenas-López, M. Sanz, J. C. Retamal +1 more·Sep 25, 2017
The quantum synchronization between a pair of two‐level systems inside two coupled cavities is studied. By using a digital–analog decomposition of the master equation that rules the system dynamics, it is shown that this approach leads to quantum syn...
String order parameters for one-dimensional Floquet symmetry protected topological phases
Ajesh Kumar, P. Dumitrescu, A. Potter·Sep 25, 2017
Floquet symmetry protected topological (FSPT) phases are non-equilibrium topological phases enabled by time-periodic driving. FSPT phases of 1d chains of bosons, spins, or qubits host dynamically protected edge states that can store quantum informati...
Ground States via Spectral Combing on a Quantum Computer
D. Kaplan, N. Klco, A. Roggero·Sep 24, 2017
A new method is proposed for determining the ground state wave function of a quantum many-body system on a quantum computer, without requiring an initial trial wave function that has good overlap with the true ground state. The technique of Spectral ...
Efficient quantum pseudorandomness with simple graph states
R. Mezher, J. Ghalbouni, J. Dgheim +1 more·Sep 23, 2017
Measurement based (MB) quantum computation allows for universal quantum computing by measuring individual qubits prepared in entangled multipartite states, known as graph states. Unless corrected for, the randomness of the measurements leads to the g...
Verification of Many-Qubit States
Yuki Takeuchi, T. Morimae·Sep 22, 2017
Verification is a task to check whether a given quantum state is close to an ideal state or not. In this paper, we show that a variety of many-qubit quantum states can be verified with only sequential single-qubit measurements of Pauli operators. Fir...
Multiqubit and multilevel quantum reinforcement learning with quantum technologies
F. A. Cárdenas-López, L. Lamata, J. C. Retamal +1 more·Sep 22, 2017
We propose a protocol to perform quantum reinforcement learning with quantum technologies. At variance with recent results on quantum reinforcement learning with superconducting circuits, in our current protocol coherent feedback during the learning ...
Thermal states as convex combinations of matrix product states
M. Berta, F. Brandão, J. Haegeman +2 more·Sep 21, 2017
We study thermal states of strongly interacting quantum spin chains and prove that those can be represented in terms of convex combinations of matrix product states. Apart from revealing new features of the entanglement structure of Gibbs states, our...
Quantum autoencoders via quantum adders with genetic algorithms
L. Lamata, U. Alvarez-Rodriguez, J. Martín-Guerrero +2 more·Sep 21, 2017
The quantum autoencoder is a recent paradigm in the field of quantum machine learning, which may enable an enhanced use of resources in quantum technologies. To this end, quantum neural networks with less nodes in the inner than in the outer layers w...
Robust quantum network architectures and topologies for entanglement distribution
Siddhartha Das, Sumeet Khatri, J. Dowling·Sep 21, 2017
Entanglement distribution is a prerequisite for several important quantum information processing and computing tasks, such as quantum teleportation, quantum key distribution, and distributed quantum computing. In this work, we focus on two-dimensiona...
Fast quantum logic gates with trapped-ion qubits
V. M. Schäfer, C. Ballance, K. Thirumalai +4 more·Sep 20, 2017
Quantum bits (qubits) based on individual trapped atomic ions are a promising technology for building a quantum computer. The elementary operations necessary to do so have been achieved with the required precision for some error-correction schemes. H...
Gate-error analysis in simulations of quantum computers with transmon qubits
D. Willsch, Madita Nocon, F. Jin +3 more·Sep 19, 2017
In the model of gate-based quantum computation, the qubits are controlled by a sequence of quantum gates. In superconducting qubit systems, these gates can be implemented by voltage pulses. The success of implementing a particular gate can be express...
Low loss QKD optical scheme for fast polarization encoding
A. Duplinskiy, V. Ustimchik, A. Kanapin +2 more·Sep 19, 2017
We present a new optical scheme for BB84 protocol quantum key distribution (QKD). The proposed setup consists of a compact all-fiber polarization encoding optical scheme based on LiNbO3 phase modulators, single laser source and two single-photon dete...
A set theoretical approach for the partial tracing operation in quantum mechanics
Pranay Barkataki, M. Ramkarthik·Sep 19, 2017
Partial trace is a very important mathematical operation in quantum mechanics. It is not only helpful in studying the subsystems of a composite quantum system but also used in computing a vast majority of quantum entanglement measures. Calculating pa...
Fault-tolerant fermionic quantum computation based on color code
Ying Li·Sep 19, 2017
An important approach to fault-tolerant quantum computation is protecting logical information using quantum error correction. Usually, logical information is in the form of logical qubits, which are encoded in physical qubits using quantum error corr...
Almost-linear time decoding algorithm for topological codes
Nicolas Delfosse, Naomi H. Nickerson·Sep 19, 2017
In order to build a large scale quantum computer, one must be able to correct errors extremely fast. We design a fast decoding algorithm for topological codes to correct for Pauli errors and erasure and combination of both errors and erasure. Our alg...