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 error correction with the toric Gottesman-Kitaev-Preskill code
Christophe Vuillot, H. Asasi, Yang Wang +2 more·Sep 28, 2018
We examine the performance of the single-mode Gottesman-Kitaev-Preskill (GKP) code and its concatenation with the toric code for a noise model of Gaussian shifts, or displacement errors. We show how one can optimize the tracking of errors in repeated...
Statistical mechanical models for quantum codes with correlated noise
Christopher T. Chubb, S. Flammia·Sep 27, 2018
We give a broad generalisation of the mapping, originally due to Dennis, Kitaev, Landahl and Preskill, from quantum error correcting codes to statistical mechanical models. We show how the mapping can be extended to arbitrary stabiliser or subsystem ...
Quantum phase estimation of multiple eigenvalues for small-scale (noisy) experiments
T. O’Brien, B. Tarasinski, B. Terhal·Sep 25, 2018
Quantum phase estimation (QPE) is the workhorse behind any quantum algorithm and a promising method for determining ground state energies of strongly correlated quantum systems. Low-cost QPE techniques make use of circuits which only use a single anc...
Boosting linear-optical Bell measurement success probability with predetection squeezing and imperfect photon-number-resolving detectors
Thomas Kilmer, S. Guha·Sep 25, 2018
Linear optical realizations of Bell state measurement (BSM) on two single-photon qubits succeed with probability $p_s$ no higher than $0.5$. However pre-detection quadrature squeezing, i.e., quantum noise limited phase sensitive amplification, in the...
Computing Wasserstein Distance for Persistence Diagrams on a Quantum Computer
Jesse Berwald, J. Gottlieb, E. Munch·Sep 17, 2018
Persistence diagrams are a useful tool from topological data analysis which can be used to provide a concise description of a filtered topological space. What makes them even more useful in practice is that they come with a notion of a metric, the Wa...
Classical simulability of noisy boson sampling
J. Renema, V. Shchesnovich, R. García-Patrón·Sep 6, 2018
Quantum mechanics promises computational powers beyond the reach of classical computers. Current technology is on the brink of an experimental demonstration of the superior power of quantum computation compared to classical devices. For such a demons...
Reinforcement learning for autonomous preparation of Floquet-engineered states: Inverting the quantum Kapitza oscillator
M. Bukov·Aug 27, 2018
I demonstrate the potential of reinforcement learning (RL) to prepare quantum states of strongly periodically driven non-linear single-particle models. The ability of Q-Learning to control systems far away from equilibrium is exhibited by steering th...
Experimental cryptographic verification for near-term quantum cloud computing.
Xi Chen, Bin Cheng, Zhaokai Li +4 more·Aug 22, 2018
An important task for quantum cloud computing is to make sure that there is a real quantum computer running, instead of classical simulation. Here we explore the applicability of a cryptographic verification scheme for verifying quantum cloud computi...
Neural-network states for the classical simulation of quantum computing
Bjarni J'onsson, B. Bauer, Giuseppe Carleo·Aug 15, 2018
Simulating quantum algorithms with classical resources generally requires exponential resources. However, heuristic classical approaches are often very efficient in approximately simulating special circuit structures, for example with limited entangl...
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 ...
Practical and reliable error bars for quantum process tomography
L. P. Thinh, P. Faist, J. Helsen +2 more·Aug 1, 2018
Current techniques in quantum process tomography typically return a single point estimate of an unknown process based on a finite albeit large amount of measurement data. Due to statistical fluctuations, however, other processes close to the point es...
Controlling Spin-Orbit Interactions in Silicon Quantum Dots Using Magnetic Field Direction
T. Tanttu, B. Hensen, K. Chan +9 more·Jul 27, 2018
Silicon quantum dots are considered an excellent platform for spin qubits, partly due to their weak spin-orbit interaction. However, the sharp interfaces in the heterostructures induce a small but significant spin-orbit interaction which degrade the ...
Low-cost error mitigation by symmetry verification
X. Bonet-Monroig, R. Sagastizabal, M. Singh +1 more·Jul 26, 2018
We investigate the performance of error mitigation via measurement of conserved symmetries on near-term devices. We present two protocols to measure conserved symmetries during the bulk of an experiment, and develop a third, zero-cost, post-processin...
Network architecture for a topological quantum computer in silicon
B. Buonacorsi, Z. Cai, E. B. Ramirez +7 more·Jul 26, 2018
A design for a large-scale surface code quantum processor based on a node/network approach is introduced for semiconductor quantum dot spin qubits. The minimal node contains only seven quantum dots, and nodes are separated on the micron scale, creati...
Silicon qubit fidelities approaching incoherent noise limits via pulse engineering
C. Yang, K. Chan, R. Harper +12 more·Jul 25, 2018
Spin qubits created from gate-defined silicon metal–oxide–semiconductor quantum dots are a promising architecture for quantum computation. The high single qubit fidelities possible in these systems, combined with quantum error correcting codes, could...
Improving quantum parameter estimation by monitoring quantum trajectories
Yao Ma, M. Pang, Libo Chen +1 more·Jul 25, 2018
Quantum-enhanced parameter estimation has widespread applications in many fields. An important issue is to protect the estimation precision against the noise-induced decoherence. Here we develop a general theoretical framework for improving the preci...
Coherent Manipulation of a Molecular Ln-Based Nuclear Qudit Coupled to an Electron Qubit.
R. Hussain, G. Allodi, A. Chiesa +7 more·Jul 24, 2018
We demonstrate that the [Yb(trensal)] molecule is a prototypical coupled electronic qubit-nuclear qudit system. The combination of noise-resilient nuclear degrees of freedom and large reduction of nutation time induced by electron-nuclear mixing enab...
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...
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...
Propagation of generalized Pauli errors in qudit Clifford circuits
Daniel Miller, T. Holz, H. Kampermann +1 more·Jul 16, 2018
It is important for performance studies in quantum technologies to analyze quantum circuits in the presence of noise. We introduce an error probability tensor, a tool to track generalized Pauli error statistics of qudits within quantum circuits compo...