Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Fibre polarisation state compensation in entanglement-based quantum key distribution.
Yicheng Shi, Hou Shun Poh, A. Ling +1 more·Jul 16, 2021
Quantum key distribution (QKD) using polarisation encoding can be hard to implement over deployed telecom fibres because the routing geometry and the birefringence of the fibre link can alter the polarisation states of the propagating photons. These ...
Fast suppression of classification error in variational quantum circuits
Bingzhi Zhang, Quntao Zhuang·Jul 16, 2021
Variational quantum circuits (VQCs) have shown great potential in near-term applications. However, the discriminative power of a VQC, in connection to its circuit architecture and depth, is not understood. To unleash the genuine discriminative power ...
First-Order Trotter Error from a Second-Order Perspective.
David Layden·Jul 16, 2021
Simulating quantum dynamics beyond the reach of classical computers is one of the main envisioned applications of quantum computers. The most promising quantum algorithms to this end in the near term are the simplest, which use the Trotter formula an...
Analytic gradients in variational quantum algorithms: Algebraic extensions of the parameter-shift rule to general unitary transformations
A. Izmaylov, Robert A. Lang, Tzu-Ching Yen·Jul 16, 2021
Optimization of unitary transformations in Variational Quantum Algorithms benefits highly from efficient evaluation of cost function gradients with respect to amplitudes of unitary generators. We propose several extensions of the parametric-shift-rul...
3D topological quantum computing
T. Asselmeyer-Maluga·Jul 16, 2021
In this paper, we will present some ideas to use 3D topology for quantum computing extending ideas from a previous paper. Topological quantum computing used “knotted” quantum states of topological phases of matter, called anyons. But anyons are conne...
Simulating quantum mechanics with a θ -term and an ’t Hooft anomaly on a synthetic dimension
Jiayu Shen, Di Luo, Chenxi Huang +4 more·Jul 16, 2021
A topological $\theta$-term in gauge theories, including quantum chromodynamics in 3+1 dimensions, gives rise to a sign problem that makes classical Monte Carlo simulations impractical. Quantum simulations are not subject to such sign problems and ar...
Implementing efficient selective quantum process tomography of superconducting quantum gates on IBM quantum experience
Akshay Gaikwad, Krishna Shende, Arvind +1 more·Jul 15, 2021
The experimental implementation of selective quantum process tomography (SQPT) involves computing individual elements of the process matrix with the help of a special set of states called quantum 2-design states. However, the number of experimental s...
Realization of Real-Time Fault-Tolerant Quantum Error Correction
C. Ryan-Anderson, J. Bohnet, K. Lee +14 more·Jul 15, 2021
Correcting errors in real time is essential for reliable large-scale quantum computations. Realizing this high-level function requires a system capable of several low-level primitives, including single-qubit and two-qubit operations, mid-circuit meas...
Open-system modeling of quantum annealing: theory and applications
K. Yip·Jul 15, 2021
In this dissertation, we explore how quantum annealing (QA) and its applications behave in an open system setting. We give derivations and numerical recipes for effective parallel simulation methods for time-dependent open dynamics of quantum anneali...
Convergence Guarantees for Discrete Mode Approximations to Non-Markovian Quantum Baths.
Rahul Trivedi, D. Malz, J. Cirac·Jul 15, 2021
Non-Markovian effects are important in modeling the behavior of open quantum systems arising in solid-state physics, quantum optics as well as in study of biological and chemical systems. The non-Markovian environment is often approximated by discret...
Divide and Conquer for Combinatorial Optimization and Distributed Quantum Computation
T. Tomesh, Zain Saleem, M. Perlin +3 more·Jul 15, 2021
Scaling the size of monolithic quantum computer systems is a difficult task. As the number of qubits within a device increases, a number of factors contribute to decreases in yield and performance. To meet this challenge, distributed architectures co...
Efficient quantum programming using EASE gates on a trapped-ion quantum computer
Nikodem Grzesiak, A. Maksymov, Pradeep Niroula +1 more·Jul 15, 2021
Parallel operations in conventional computing have proven to be an essential tool for efficient and practical computation, and the story is not different for quantum computing. Indeed, there exists a large body of works that study advantages of paral...
Floquet prethermal phase protected by U(1) symmetry on a superconducting quantum processor
C. Ying, Qi Guo, Shaowei Li +22 more·Jul 15, 2021
Periodically driven systems, or Floquet systems, exhibit many novel dynamics and interesting outof-equilibrium phases of matter. Those phases arising with the quantum systems’ symmetries, such as global U(1) symmetry, can even show dynamical stabilit...
Best-approximation error for parametric quantum circuits
L. Funcke, T. Hartung, K. Jansen +3 more·Jul 15, 2021
In Variational Quantum Simulations, the construction of a suitable parametric quantum circuit is subject to two counteracting effects. The number of parameters should be small for the device noise to be manageable, but also large enough for the circu...
Resource allocation in a Quantum Key Distribution Network with LEO and GEO trusted-repeaters
Milo Grillo, A. Dowhuszko, M. Khalighi +1 more·Jul 15, 2021
Quantum Key Distribution (QKD) is a technology that enables the exchange of private encryption keys between two legitimate parties, using protocols that involve quantum mechanics principles. The rate at which secret keys can be exchanged depends on t...
Advancing hybrid quantum-classical algorithms via mean operators
Donggyu Kim, Pureum Noh, Hyun-yong Lee +1 more·Jul 15, 2021
Entanglement in quantum many-body systems is the key concept for future technology and science, opening up a possibility to explore uncharted realms in an enormously large Hilbert space. The hybrid quantum-classical algorithms have been suggested to ...
Szegedy Walk Unitaries for Quantum Maps
P. Wocjan, K. Temme·Jul 15, 2021
Szegedy developed a generic method for quantizing classical algorithms based on random walks (Szegedy, in: 45th annual IEEE Symposium on Foundations of Computer Science, pp 32–41, 2004. https://doi.org/10.1109/FOCS.2004.53 ). A major contribution of ...
Sampling on NISQ Devices: "Who’s the Fairest One of All?"
Elijah Pelofske, John K. Golden, Andreas Bärtschi +2 more·Jul 14, 2021
Modern NISQ devices are subject to a variety of biases and sources of noise that degrade the solution quality of computations carried out on these devices. A natural question that arises in the NISQ era, is how fairly do these devices sample ground s...
Empirical Evaluation of Circuit Approximations on Noisy Quantum Devices
E. Wilson, F. Mueller, Lindsay Bassman +1 more·Jul 14, 2021
Noisy Intermediate-Scale Quantum (NISQ) devices fail to produce outputs with sufficient fidelity for deep circuits with many gates today. Such devices suffer from read-out, multi-qubit gate and cross-talk noise combined with short decoherence times l...
Review of performance metrics of spin qubits in gated semiconducting nanostructures
P. Stano, D. Loss·Jul 14, 2021
This Technical Review collects values of selected performance characteristics of semiconductor spin qubits defined in electrically controlled nanostructures. The characteristics are envisaged to serve as a community source for the values of figures o...