Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Multiqubit matter-wave interferometry under decoherence and the Heisenberg scaling recovery
Yanming Che, Jing Liu, X.-M. Lu +1 more·Aug 14, 2018
Most matter-wave interferometry (MWI) schemes for quantum sensing have so far been evaluated in ideal situations without noise. In this work, we provide assessments of generic multiqubit MWI schemes under Markovian dephasing noise. We find that, for ...
Epsilon-Near-Zero Quantum Networks
L. Vertchenko, N. Akopian, A. Lavrinenko·Aug 13, 2018
Realization of an on-chip quantum network is a major goal in the field of integrated quantum photonics. A typical network scalable on-chip demands optical integration of single photon sources, optical circuitry and detectors for routing and processin...
Experimentally identifying the entanglement class of pure tripartite states
Amandeep Singh, K. Dorai, Arvind·Aug 9, 2018
We use concurrence as an entanglement measure and experimentally demonstrate the entanglement classification of arbitrary three-qubit pure states on a nuclear magnetic resonance quantum information processor. Computing the concurrence experimentally ...
Jointly Constrained Semidefinite Bilinear Programming With an Application to Dobrushin Curves
Stefan Huber, R. König, M. Tomamichel·Aug 9, 2018
We propose a branch-and-bound algorithm for minimizing a bilinear functional of the form <inline-formula> <tex-math notation="LaTeX">$f(X,Y) = \mathrm {tr}((X\otimes Y)Q)+ \mathrm {tr}(AX)+ \mathrm {tr}(BY) $ </tex-math></inline-formula>, of pairs of...
Algorithmic No-Cloning Theorem
Samuel Epstein·Aug 9, 2018
We introduce notions of algorithmic mutual information and deficiency of randomness of quantum states. These definitions enjoy conservation inequalities over unitary transformations and partial traces. We show that a large majority of pure states hav...
Fast and Scalable Quantum Information Processing with Two‐Electron Atoms in Optical Tweezer Arrays
G. Pagano, F. Scazza, M. Foss-Feig·Aug 7, 2018
Atomic systems, ranging from trapped ions to ultracold and Rydberg atoms, offer unprecedented control over both internal and external degrees of freedom at the single‐particle level. They are considered among the foremost candidates for realizing qua...
Selective and efficient quantum process tomography in arbitrary finite dimension
I. Perito, A. Roncaglia, A. Bendersky·Aug 3, 2018
The characterization of quantum processes is a key tool in quantum information processing tasks for several reasons: on one hand, it allows to acknowledge errors in the implementations of quantum algorithms; on the other, it allows to charcaterize un...
Simulating 0+1 Dimensional Quantum Gravity on Quantum Computers: Mini-Superspace Quantum Cosmology and the World Line Approach in Quantum Field Theory
C. D. Kocher, M. McGuigan·Aug 1, 2018
Quantum computers are promising candidates to radically expand the domain of computational science by their increased computing power and more effective algorithms. In particular, quantum computing could have a tremendous impact on the field of quant...
QEngine: A C++ library for quantum optimal control of ultracold atoms
J. J. Sørensen, J. H. Jensen, T. Heinzel +1 more·Jul 31, 2018
Abstract We present the first version of the QEngine, an open-source C++ library for performing optimal control of ultracold quantum systems. The most notable systems presented here are Bose–Einstein condensates, many-body systems described by Bose–H...
Ultrastrong coupling between light and matter
Anton Frisk Kockum, A. Miranowicz, S. De Liberato +2 more·Jul 31, 2018
Light–matter coupling with strength comparable to the bare transition frequencies of the system is called ultrastrong. This Review surveys how experiments have realized ultrastrong coupling in the past decade, the new phenomena predicted in this regi...
Distributed Encoding and Decoding of Quantum Information over Networks
H. Yamasaki, M. Murao·Jul 30, 2018
Encoding and decoding quantum information in a multipartite quantum system are indispensable for quantum error correction and also play crucial roles in multiparty tasks in distributed quantum information processing such as quantum secret sharing. To...
Quantized Hodgkin-Huxley Model for Quantum Neurons
Xiao-Hang Cheng, Tasio Gonzalez-Raya, Xi Chen +2 more·Jul 27, 2018
The Hodgkin-Huxley model describes the behavior of the membrane voltage in neurons, treating each element of the cell membrane as an electric circuit element, namely capacitors, memristors and voltage sources. We focus on the activation channel of po...
Hybrid quantum linear equation algorithm and its experimental test on IBM Quantum Experience
Yonghae Lee, J. Joo, Soojoon Lee·Jul 27, 2018
We propose a hybrid quantum algorithm based on the Harrow-Hassidim-Lloyd (HHL) algorithm for solving a system of linear equations. In this paper, we show that our hybrid algorithm can reduce a circuit depth from the original HHL algorithm by means of...
Algorithmic simulation of far-from-equilibrium dynamics using quantum computer
A. Zhukov, S. Remizov, W. Pogosov +2 more·Jul 25, 2018
We point out that superconducting quantum computers are prospective for the simulation of the dynamics of spin models far from equilibrium, including nonadiabatic phenomena and quenches. The important advantage of these machines is that they are prog...
Stabilized Cat in a Driven Nonlinear Cavity: A Fault-Tolerant Error Syndrome Detector
S. Puri, A. Grimm, P. Campagne-Ibarcq +7 more·Jul 24, 2018
In quantum error correction, information is encoded in a high-dimensional system to protect it from the environment. A crucial step is to use natural, low-weight operations with an ancilla to extract information about errors without causing backactio...
Scaling laws of the Kondo problem at finite frequency
L. Bruhat, J. Viennot, M. Dartiailh +3 more·Jul 23, 2018
Driving a quantum system at finite frequency allows one to explore its dynamics. This has become a well-mastered resource for controlling the quantum state of two-level systems in the context of quantum information processing. However, this can also ...
A quantum Johnson-Lindenstrauss lemma via unitary t-designs
Pranab Sen·Jul 23, 2018
The famous Johnson-Lindenstrauss lemma states that for any set of n vectors, there is a linear transformation into a space of dimension O(log n) that approximately preserves all their lengths. In fact, a Haar random unitary transformation followed by...
Experimental repetitive quantum channel simulation.
Ling Hu, X. Mu, W. Cai +6 more·Jul 20, 2018
Universal control of quantum systems is a major goal to be achieved for quantum information processing, which demands thorough understanding of fundamental quantum mechanics and promises applications of quantum technologies. So far, most studies conc...
Local-measurement-based quantum state tomography via neural networks
T. Xin, Sirui Lu, Ningping Cao +5 more·Jul 19, 2018
Quantum state tomography is a daunting challenge of experimental quantum computing, even in moderate system size. One way to boost the efficiency of state tomography is via local measurements on reduced density matrices, but the reconstruction of the...
Passive, deterministic photonic conditional-phase gate via two-level systems
William Konyk, J. Gea-Banacloche·Jul 19, 2018
Photons are one of the best carriers of quantum information, as they interact only weakly with the environment, and photon processes are fast and efficient. Despite these advantages, two main issues have prevented alloptical quantum computing from be...