Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Phenomenological theory of variational quantum ground-state preparation
Nikita Astrakhantsev, G. Mazzola, I. Tavernelli +1 more·May 12, 2022
The variational approach is a cornerstone of computational physics, considering both conventional and quantum computing computational platforms. The variational quantum eigensolver (VQE) algorithm aims to prepare the ground state of a Hamiltonian exp...
Stabilizer Inactivation for Message-Passing Decoding of Quantum LDPC Codes
Julien du Crest, M. Mhalla, V. Savin·May 12, 2022
We propose a post-processing method for message-passing (MP) decoding of CSS quantum LDPC codes, called stabilizer-inactivation (SI). It relies on inactivating a set of qubits, supporting a check in the dual code, and then running the MP decoding aga...
Efficient quantum state tracking in noisy environments
M. Rambach, Akram Youssry, M. Tomamichel +1 more·May 12, 2022
Quantum state tomography, which aims to find the best description of a quantum state—the density matrix, is an essential building block in quantum computation and communication. Standard techniques for state tomography are incapable of tracking chang...
Cutting Quantum Circuits to Run on Quantum and Classical Platforms
Wei Tang, M. Martonosi·May 12, 2022
Quantum computing (QC) offers a new computing paradigm that has the potential to provide significant speedups over classical computing. Each additional qubit doubles the size of the computational state space available to a quantum algorithm. Such expo...
Qubit-efficient simulation of thermal states with quantum tensor networks
Yuxuan Zhang, Shahin Jahanbani, Daoheng Niu +2 more·May 12, 2022
We present a holographic quantum simulation algorithm to variationally prepare thermal states of d -dimensional interacting quantum many-body systems, using only enough hardware qubits to represent a ( d -1)-dimensional cross-section. This technique ...
Fundamental limitations on optimization in variational quantum algorithms
Hao-Kai Zhang, Chengkai Zhu, Geng-yang Liu +1 more·May 10, 2022
Exploring quantum applications of near-term quantum devices is a rapidly growing field of quantum information science with both theoretical and practical interests. A leading paradigm to establish such near-term quantum applications is variational qu...
Practical application-specific advantage through hybrid quantum computing
M. Perelshtein, A. Sagingalieva, Karan Pinto +7 more·May 10, 2022
Quantum computing promises to tackle technological and industrial problems insurmountable for classical computers. However, today's quantum computers still have limited demonstrable functionality, and it is expected that scaling up to millions of qub...
DisCoPy for the quantum computer scientist
Alexis Toumi, G. Felice, Richie Yeung·May 10, 2022
DisCoPy (Distributional Compositional Python) is an open source toolbox for computing with string diagrams and functors. In particular, the diagram data structure allows to encode various kinds of quantum processes, with functors for classical simula...
Software tool-set for automated quantum system identification and device bring up
Anurag Saha Roy, K. Pack, N. Wittler +1 more·May 10, 2022
We present a software tool-set which combines the theoretical, optimal control view of quantum devices with the practical operation and characterization tasks required for quantum computing. In the same framework, we perform model-based simulations t...
Gradient-Free optimization algorithm for single-qubit quantum classifier
Anqi Zhang, Xiaoyun He, Sheng-mei Zhao·May 10, 2022
In the paper, a gradient-free optimization algorithm for single-qubit quantum classifier is proposed to overcome the effects of barren plateau caused by quantum devices. A rotation gate RX({\phi}) is applied on a single-qubit binary quantum classifie...
Supply chain logistics with quantum and classical annealing algorithms
Sean J. Weinberg, F. Sanches, T. Ide +2 more·May 9, 2022
Noisy intermediate-scale quantum (NISQ) hardware is almost universally incompatible with full-scale optimization problems of practical importance which can have many variables and unwieldy objective functions. As a consequence, there is a growing bod...
Robust, fast and high-fidelity composite single-qubit gates for superconducting transmon qubits
Hristo G. Tonchev, B. Torosov, N. Vitanov·May 9, 2022
We introduce a novel quantum control method for superconducting transmon qubits that substantially outperforms conventional techniques in precision and robustness against coherent errors. Our approach leverages composite pulses (CP) to effectively mi...
Hidden orders and phase transitions for the fully packed quantum loop model on the triangular lattice
Xiaoxue Ran, Zheng Yan, Yancheng Wang +5 more·May 9, 2022
By using the sweeping cluster quantum Monte Carlo algorithm, the authors reveal the complete ground-state phase diagram of the triangular-lattice fully packed quantum loop model. They discover a hidden vison plaquette phase between the known lattice ...
Demonstration of Tunable Three-Body Interactions between Superconducting Qubits.
Tim Menke, W. Banner, Thomas R. Bergamaschi +16 more·May 9, 2022
Nonpairwise multiqubit interactions present a useful resource for quantum information processors. Their implementation would facilitate more efficient quantum simulations of molecules and combinatorial optimization problems, and they could simplify e...
Variational quantum attacks threaten advanced encryption standard based symmetric cryptography
Zeguo Wang, Shijie Wei, G. Long +1 more·May 7, 2022
We propose a variational quantum attack algorithm (VQAA) for classical advanced encryption standard (AES)-like symmetric cryptography, as exemplified by the simplified-data encryption standard (S-DES). In the VQAA, the known ciphertext is encoded as ...
Comparison between the Iterative Local Search and Exhaustive Search methods applied to QAOA in Max-Cut and Ising Spin Model problems
Brian García Sarmina·May 6, 2022
A comparison is made between Exhaustive Search (ES) and Iterative Local Search (ILS). Such comparison was made using the Quantum Approximation Optimization Algorithm (QAOA). QAOA has been extensively researched due to its this potential to be impleme...
Variational quantum algorithm for unconstrained black box binary optimization: Application to feature selection
Christa Zoufal, R. Mishmash, Nitin Sharma +6 more·May 6, 2022
We introduce a variational quantum algorithm to solve unconstrained black box binary optimization problems, i.e., problems in which the objective function is given as black box. This is in contrast to the typical setting of quantum algorithms for opt...
Coupled dynamics of spin qubits in optical dipole microtraps: Application to the error analysis of a Rydberg-blockade gate
L. Gerasimov, R. Yusupov, A. D. Moiseevsky +6 more·May 6, 2022
Single atoms in dipole microtraps or optical tweezers have recently become a promising platform for quantum computing and simulation. Here we report a detailed theoretical analysis of the physics underlying an implementation of a Rydberg two-qubit ga...
Optimal compression of quantum many-body time evolution operators into brickwall circuits
M. Tepaske, D. Hahn, D. J. Luitz·May 6, 2022
Near term quantum computers suffer from a degree of decoherence which is prohibitive for high fidelity simulations with deep circuits. An economical use of circuit depth is therefore paramount. For digital quantum simulation of quantum many-body syst...
Variational Quantum Optimization of Nonlocality in Noisy Quantum Networks
Brian Doolittle, T. Bromley, N. Killoran +1 more·May 5, 2022
The noise and complexity inherent to quantum communication networks leads to technical challenges in designing quantum network protocols using classical methods. We address this issue with a hybrid variational quantum optimization (VQO) framework tha...