Papers
Live trends in quantum computing research, updated daily from arXiv.
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15,673 papers in 12 months (-39% vs prior quarter)
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Variational quantum compiling with double Q-learning
Zhimin He, Lvzhou Li, Shenggen Zheng +2 more·Mar 22, 2021
Quantum compiling aims to construct a quantum circuit V by quantum gates drawn from a native gate alphabet, which is functionally equivalent to the target unitary U. It is a crucial stage for the running of quantum algorithms on noisy intermediate-sc...
Parameter concentrations in quantum approximate optimization
V. Akshay, D. Rabinovich, E. Campos +1 more·Mar 22, 2021
The quantum approximate optimization algorithm (QAOA) has become a cornerstone of contemporary quantum applications development. In QAOA, a quantum circuit is trained -- by repeatedly adjusting circuit parameters -- to solve a problem. Several recent...
Simulation of adiabatic quantum computing for molecular ground states.
Vladimir Kremenetski, Carlos Mejuto-Zaera, Stephen J. Cotton +1 more·Mar 22, 2021
Quantum computation promises to provide substantial speedups in many practical applications with a particularly exciting one being the simulation of quantum many-body systems. Adiabatic state preparation (ASP) is one way that quantum computers could ...
QuClassi: A Hybrid Deep Neural Network Architecture based on Quantum State Fidelity
S. Stein, Y. Mao, Betis Baheri +5 more·Mar 21, 2021
In the past decade, remarkable progress has been achieved in deep learning related systems and applications. In the post Moore's Law era, however, the limit of semiconductor fabrication technology along with the increasing data size have slowed down ...
Rapid and unconditional parametric reset protocol for tunable superconducting qubits
Yu Zhou, Zhenxing Zhang, Z. Yin +16 more·Mar 21, 2021
Qubit initialization is a critical task in quantum computation and communication. Extensive efforts have been made to achieve this with high speed, efficiency and scalability. However, previous approaches have either been measurement-based and requir...
Non-Clifford gate on optical qubits by nonlinear feedforward
Shunya Konno, W. Asavanant, Kosuke Fukui +6 more·Mar 19, 2021
Shunya Konno,1 Warit Asavanant,1 Kosuke Fukui,1 Atsushi Sakaguchi,1, 2 Fumiya Hanamura,1 Petr Marek,3 Radim Filip,3 Jun-ichi Yoshikawa,1 and Akira Furusawa1, 2, ∗ 1Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 H...
Quantum machine learning of graph-structured data
Kerstin Beer, Megha Khosla, Julius Kohler +1 more·Mar 19, 2021
Graph structures are ubiquitous throughout the natural sciences. Here we consider graph-structured quantum data and describe how to carry out its quantum machine learning via quantum neural networks. In particular, we consider training data in the fo...
Quantum sensing with superconducting circuits
S. Danilin, M. Weides·Mar 19, 2021
Sensing and metrology play an important role in fundamental science and applications, by fulfilling the ever-present need for more precise data sets, and by allowing to make more reliable conclusions on the validity of theoretical models. Sensors are...
Circuit quantum electrodynamics (cQED) with modular quasi-lumped models
Z. Minev, T. McConkey, M. Takita +2 more·Mar 18, 2021
Extracting the Hamiltonian of interacting quantum-information processing systems is a keystone problem in the realization of complex phenomena and large-scale quantum computers. The remarkable growth of the field increasingly requires precise, widely...
Faster Quantum-inspired Algorithms for Solving Linear Systems
Changpeng Shao, A. Montanaro·Mar 18, 2021
We establish an improved classical algorithm for solving linear systems in a model analogous to the QRAM that is used by quantum linear solvers. Precisely, for the linear system \( A{\bf x}= {\bf b} \) , we show that there is a classical algorithm th...
Lorentz quantum computer
Wenhao He, Zhenduo Wang, Biao Wu·Mar 18, 2021
A theoretical model of computation is proposed based on Lorentz quantum mechanics. Besides the standard qubits, this model has an additional bit, which we call hyperbolic bit (or hybit in short). A set of basic logical gates are constructed and their...
Quantum-enhanced radiometry via approximate quantum error correction
W. Wang, Z. Chen, X. Liu +12 more·Mar 18, 2021
Quantum sensing based on exotic quantum states is appealing for practical metrology applications and fundamental studies. However, these quantum states are vulnerable to noise and the resulting quantum enhancement is weakened in practice. Here, we ex...
Faster Coherent Quantum Algorithms for Phase, Energy, and Amplitude Estimation
Patrick Rall·Mar 17, 2021
We consider performing phase estimation under the following conditions: we are given only one copy of the input state, the input state does not have to be an eigenstate of the unitary, and the state must not be measured. Most quantum estimation algor...
Digital Quantum Simulation of Open Quantum Systems Using Quantum Imaginary–Time Evolution
Hirsh Kamakari, Shi-Ning Sun, M. Motta +1 more·Mar 17, 2021
Quantum simulation on emerging quantum hardware is a topic of intense interest. While many studies focus on computing ground state properties or simulating unitary dynamics of closed systems, open quantum systems are an interesting target of study ow...
Computing Free Energies with Fluctuation Relations on Quantum Computers.
Lindsay Bassman Oftelie, Katherine Klymko, Diyi Liu +2 more·Mar 17, 2021
As a central thermodynamic property, free energy enables the calculation of virtually any equilibrium property of a physical system, allowing for the construction of phase diagrams and predictions about transport, chemical reactions, and biological p...
Quantum Computation and Communication in Bosonic Systems
Kyungjoo Noh·Mar 17, 2021
Quantum computation and communication are important branches of quantum information science. However, noise in realistic quantum devices fundamentally limits the utility of these quantum technologies. A conventional approach towards large-scale and f...
A context-aware gate set tomography characterization of superconducting qubits
Ahmed Abid Moueddene, N. Khammassi, Sebastian Feld +1 more·Mar 17, 2021
The efficiency of Quantum Characterisation, Verification, and Validation (QCVV) protocols highly hinges on the agreement between the assumed noise model and the underlying error mechanisms. As a matter of fact, errors in Quantum Processing Units (QPU...
Quantum Machine Learning with HQC Architectures using non-Classically Simulable Feature Maps
Syed Farhan Ahmad, Raghav Rawat, Minal Moharir·Mar 17, 2021
Hybrid Quantum-Classical (HQC) Architectures are used in near-term NISQ Quantum Computers for solving Quantum Machine Learning problems. The quantum advantage comes into picture due to the exponential speedup offered over classical computing. One of ...
Strong parametric dispersive shifts in a statically decoupled two-qubit cavity QED system
T. Noh, Zhihao Xiao, K. Cicak +8 more·Mar 16, 2021
Qubits in cavity quantum electrodynamic (QED) architectures are often operated in the dispersive regime, in which the operating frequency of the cavity depends on the energy state of the qubit, and vice versa. The ability to tune these dispersive shi...
A Semiclassical Proof of Duality Between the Classical BSC and the Quantum PSC
Narayanan Rengaswamy, H. Pfister·Mar 16, 2021
In 2018, Renes [IEEE Trans. Inf. Theory, vol. 64, no. 1, pp. 577-592 (2018)] developed a general theory of channel duality for classical-input quantum-output (CQ) channels. That result showed that a number of well-known duality results for linear cod...