Papers
Live trends in quantum computing research, updated daily from arXiv.
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31,611
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15,670 papers in 12 months (-39% vs prior quarter)
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Single-mode fiber coupling with a M-SPGD algorithm for long-range quantum communications.
Kui-Xing Yang, Maimaiti Abulizi, Yuhuai Li +7 more·Nov 23, 2020
Satellite-based quantum communication is a promising approach for realizing global-scale quantum networks. For free-space quantum channel, single-mode fiber coupling is particularly important for improving the signal-to-noise ratio of daylight quantu...
Compact and Tunable Forward Coupler Based on High-Impedance Superconducting Nanowires
M. Colangelo, Di Zhu, D. Santavicca +3 more·Nov 23, 2020
Developing compact, low-dissipation, cryogenic-compatible microwave electronics is essential for scaling up low-temperature quantum computing systems. In this paper, we demonstrate an ultra-compact microwave directional forward coupler based on high-...
Non-equilibrium dynamics of a dissipative two-site Hubbard model simulated on IBM quantum computers
S. Tornow, W. Gehrke, U. Helmbrecht·Nov 22, 2020
Many-body physics is one very well suited field for testing quantum algorithms and for finding working heuristics on present quantum computers. We have investigated the non-equilibrium dynamics of one- and two-electron systems, which are coupled to a...
Solving nonlinear differential equations with differentiable quantum circuits
O. Kyriienko, Annie E. Paine, V. Elfving·Nov 20, 2020
We propose a quantum algorithm to solve systems of nonlinear differential equations. Using a quantum feature map encoding, we define functions as expectation values of parametrized quantum circuits. We use automatic differentiation to represent funct...
Efficient preparation of 2D defect-free atom arrays with near-fewest sorting-atom moves
Cheng Sheng, Jiayi Hou, Xiaodong He +7 more·Nov 20, 2020
Sorting atoms stochastically loaded in optical tweezer array via an auxiliary mobile tweezer is an efficient approach to prepare defect-free atom arrays of arbitrary geometries. However, high filling fraction of atom-by-atom assemblers is impeded by ...
On barren plateaus and cost function locality in variational quantum algorithms
A. Uvarov, J. Biamonte·Nov 20, 2020
Variational quantum algorithms rely on gradient based optimization to iteratively minimize a cost function evaluated by measuring output(s) of a quantum processor. A barren plateau is the phenomenon of exponentially vanishing gradients in sufficientl...
Quantum Ciphertext Dimension Reduction Scheme for Homomorphic Encrypted Data
Changqing Gong, Z. Dong, A. Gani +1 more·Nov 19, 2020
At present, in the face of the huge and complex data in cloud computing, the parallel computing ability of quantum computing is particularly important. Quantum principal component analysis algorithm is used as a method of quantum state tomography. We...
Quadratic Clifford expansion for efficient benchmarking and initialization of variational quantum algorithms
K. Mitarai, Yasunari Suzuki, W. Mizukami +2 more·Nov 19, 2020
Variational quantum algorithms are appealing applications of near-term quantum computers. However, there are two major issues to be solved, that is, we need an efficient initialization strategy for parametrized quantum circuit and to know the limitat...
Cryogenic amplification of image-charge detection for readout of quantum states of electrons on liquid helium
A. Elarabi, E. Kawakami, Denis Konstantinov·Nov 19, 2020
Accurate detection of quantum states is a vital step in the development of quantum computing. Image-charge detection of quantum states of electrons on liquid helium can potentially be used for the readout of a single-electron qubit; however, low sens...
Quantum Multiple Kernel Learning
Seyed Shakib Vedaie, M. Noori, J. S. Oberoi +2 more·Nov 19, 2020
Kernel methods play an important role in machine learning applications due to their conceptual simplicity and superior performance on numerous machine learning tasks. Expressivity of a machine learning model, referring to the ability of the model to ...
Robust Shadow Estimation
Senrui Chen, Wenjun Yu, Pei Zeng +1 more·Nov 19, 2020
Efficiently estimating properties of large and strongly coupled quantum systems is a central focus in many-body physics and quantum information theory. While quantum computers promise speedups for many such tasks, near-term devices are prone to noise...
Quantum complexity of minimum cut
Simon Apers, Troy Lee·Nov 19, 2020
The minimum cut problem in an undirected and weighted graph G is to find the minimum total weight of a set of edges whose removal disconnects G. We completely characterize the quantum query and time complexity of the minimum cut problem in the adjace...
Topological obstructions to quantum computation with unitary oracles
Zuzana Gavorov'a, M. Seidel, Y. Touati·Nov 19, 2020
Algorithms with unitary oracles can be nested, which makes them extremely versatile. An example is the phase estimation algorithm used in many candidate algorithms for quantum speed-up. The search for new quantum algorithms benefits from understandin...
Contextual Subspace Variational Quantum Eigensolver
William M. Kirby, A. Tranter, P. Love·Nov 19, 2020
We describe the contextual subspace variational quantum eigensolver (CS-VQE), a hybrid quantum-classical algorithm for approximating the ground state energy of a Hamiltonian. The approximation to the ground state energy is obtained as the sum of two ...
Reservoir Computing Approach to Quantum State Measurement
Gerasimos Angelatos, S. Khan, H. Türeci·Nov 19, 2020
Rapid and accurate quantum state measurement is important for maximizing the extracted information from a quantum system. Its optimization plays a critical role in particular for multi-qubit quantum processors deployed for NISQ-era quantum algorithms...
Improved Metropolis–Hastings algorithms via landscape modification with applications to simulated annealing and the Curie–Weiss model
Michael C. H. Choi·Nov 19, 2020
Abstract In this paper, we propose new Metropolis–Hastings and simulated annealing algorithms on a finite state space via modifying the energy landscape. The core idea of landscape modification rests on introducing a parameter c, such that the landsc...
Proposal for Entangling Gates on Fluxonium Qubits via a Two-Photon Transition
K. Nesterov, Q. Ficheux, V. Manucharyan +1 more·Nov 19, 2020
We propose a family of microwave-activated entangling gates on two capacitively coupled fluxonium qubits. A microwave pulse applied to either qubit at a frequency near the half-frequency of the $|00\rangle - |11\rangle$ transition induces two-photon ...
Securing Quantum Computations in the NISQ Era
D. Leichtle, Luka Music, E. Kashefi +1 more·Nov 19, 2020
Recent experimental achievements motivate an ever-growing interest from companies starting to feel the limitations of classical computing. Yet, in light of ongoing privacy scandals, the future availability of quantum computing through remotely access...
(Sub)Exponential advantage of adiabatic Quantum computation with no sign problem
Andr'as Gily'en, U. Vazirani·Nov 18, 2020
We demonstrate the possibility of (sub)exponential quantum speedup via a quantum algorithm that follows an adiabatic path of a gapped Hamiltonian with no sign problem. The Hamiltonian that exhibits this speed-up comes from the adjacency matrix of an ...
Hole Spin Qubits in Si FinFETs With Fully Tunable Spin-Orbit Coupling and Sweet Spots for Charge Noise
S. Bosco, B. Het'enyi, D. Loss·Nov 18, 2020
The strong spin-orbit coupling in hole spin qubits enables fast and electrically tunable gates, but at the same time enhances the susceptibility of the qubit to charge noise. Suppressing this noise is a significant challenge in semiconductor quantum ...