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Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Tuning Superinductors by Quantum Coherence Effects for Enhancing Quantum Computing.
Bo Fan, Abhisek Samanta, Antonio M. Garc'ia-Garc'ia·Dec 22, 2021
Research on spatially inhomogeneous weakly coupled superconductors has recently received a boost of interest because of the experimental observation of a dramatic enhancement of the kinetic inductance with relatively low losses. Here, we study the ki...
Two-dimensional $\mathbb{Z}_2$ lattice gauge theory on a near-term quantum simulator: variational quantum optimization, confinement, and topological order
Luca Lumia, Pietro Torta, G. Mbeng +4 more·Dec 22, 2021
We propose an implementation of a two-dimensional $\mathbb{Z}_2$ lattice gauge theory model on a shallow quantum circuit, involving a number of single and two-qubits gates comparable to what can be achieved with present-day and near-future technologi...
Realizations of Measurement Based Quantum Computing
S. Shah·Dec 22, 2021
The Measurement Based Quantum Computation (MBQC) model achieves universal quantum computation by employing projective single qubit measurements with classical feedforward on a highly entangled multipartite cluster state [1]. Rapid advances in improvi...
Efficient Quantum Network Communication Using Optimized Entanglement Swapping Trees
Mohammad Ghaderibaneh, Caitao Zhan, Himanshu Gupta +1 more·Dec 21, 2021
Quantum network communication is challenging, as the no-cloning theorem in the quantum regime makes many classical techniques inapplicable; in particular, the direct transmission of qubit states over long distances is infeasible due to unrecoverable ...
Efficient Classical Computation of Quantum Mean Values for Shallow QAOA Circuits
Wei-Feng Zhuang, Yanping Pu, Hong-Ze Xu +9 more·Dec 21, 2021
The Quantum Approximate Optimization Algorithm (QAOA), which is a variational quantum algorithm, aims to give sub-optimal solutions of combinatorial optimization problems. It is widely believed that QAOA has the potential to demonstrate application-l...
Feasibility Analysis of Cracking RSA with Improved Quantum Circuits of the Shor’s Algorithm
Xia Liu, H. Yang, Li Yang·Dec 21, 2021
Since the RSA public key cryptosystem was proposed, it has been widely used because of its strong security. Although the proposal of the Shor’s algorithm offers hope for cracking RSA, it is debatable whether the algorithm can actually pose a threat i...
Omnisolver: An extensible interface to Ising spin-glass and QUBO solvers
Konrad Jalowiecki, Lukasz Pawela·Dec 21, 2021
We introduce a new framework for implementing Binary Quadratic Model (BQM) solvers called Omnisolver. The framework provides an out-of-the-box dynamically built command-line interface as well as an input/output system, thus heavily reducing the effor...
Shortcuts to the quantum approximate optimization algorithm
Yahui Chai, Yongjian Han, Yuchun Wu +3 more·Dec 21, 2021
The Quantum Approximate Optimization Algorithm (QAOA) is a quantum-classical hybrid algorithm intending to find the ground state of a target Hamiltonian. Theoretically, QAOA can obtain the approximate solution if the quantum circuit is deep enough. A...
Mitigating barren plateaus with transfer-learning-inspired parameter initializations
Huan-Yu Liu, Tai-ping Sun, Yuchun Wu +2 more·Dec 21, 2021
Variational quantum algorithms (VQAs) are widely applied in the noisy intermediate-scale quantum era and are expected to demonstrate quantum advantage. However, training VQAs faces difficulties, one of which is the so-called barren plateaus (BPs) phe...
Efficient Floating Point Arithmetic for Quantum Computers
Raphael Seidel, Nikolay Tcholtchev, Sebastian Bock +2 more·Dec 20, 2021
One of the major promises of quantum computing is the realization of SIMD (single instruction - multiple data) operations using the phenomenon of superposition. Since the dimension of the state space grows exponentially with the number of qubits, we ...
Improved polar-code-based efficient post-processing algorithm for quantum key distribution
Jun-bin Fang, Zhengzhong Yi, Jin Li +5 more·Dec 20, 2021
Combined with one-time pad encryption scheme, quantum key distribution guarantees the unconditional security of communication in theory. However, error correction and privacy amplification in the post-processing phase of quantum key distribution resu...
Calculation of Core-Excited and Core-Ionized States Using Variational Quantum Deflation Method and Applications to Photocatalyst Modeling
Soichi Shirai, Takahiro Horiba, H. Hirai·Dec 20, 2021
The possibility of performing quantum-chemical calculations using quantum computers has attracted much interest. Variational quantum deflation (VQD) is a quantum-classical hybrid algorithm for the calculation of excited states with noisy intermediate...
Quantum error correction with the color-Gottesman-Kitaev-Preskill code
Jiaxuan Zhang, Jian Zhao, Yuchun Wu +1 more·Dec 20, 2021
Jiaxuan Zhang, 2 Jian Zhao, 2 Yu-Chun Wu, 2, 3, ∗ and Guo-Ping Guo 2, 3, 4 Key Laboratory of Quantum Information, Chinese Academy of Sciences, School of Physics, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China CAS Cen...
Measurement-based generation and preservation of cat and grid states within a continuous-variable cluster state
M. Eaton, C. González-Arciniegas, R. N. Alexander +2 more·Dec 20, 2021
We present an algorithm to reliably generate various quantum states critical to quantum error correction and universal continuous-variable (CV) quantum computing, such as Schrödinger cat states and Gottesman-Kitaev-Preskill (GKP) grid states, out of ...
A χ²-based AlGaAs Phase Sensitive Amplifier with Record Gain, Noise and Sensitivity
Zhizhong Yan, Haoyu He, Han Liu +7 more·Dec 20, 2021
Phase sensitive amplifiers (PSAs) have the potential to empower substantial advances in emerging generations of optical communication systems as well as classical and quantum on-chip signal processing. While the second order nonlinearity (χ2) is stro...
Variational Quantum‐Neural Hybrid Error Mitigation
Shi-Xin Zhang, Z. Wan, Chang-Yu Hsieh +2 more·Dec 20, 2021
Quantum error mitigation (QEM) is crucial for obtaining reliable results on quantum computers by suppressing quantum noise with moderate resources. It is a key factor for successful and practical quantum algorithm implementations in the noisy interme...
Quantum Circuit Transformations with a Multi-Level Intermediate Representation Compiler
Thien Nguyen, Dmitry I. Lyakh, R. Pooser +3 more·Dec 20, 2021
Quantum computing promises remarkable approaches for processing information, but new tools are needed to compile program representations into the physical instructions required by a quantum computer. Here we present a novel adaptation of the multi-le...
Variational Quantum Soft Actor-Critic
Qingfeng Lan·Dec 20, 2021
Quantum computing has a superior advantage in tackling specific problems, such as integer factorization and Simon's problem. For more general tasks in machine learning, by applying variational quantum circuits, more and more quantum algorithms have b...
Practical Quantum State Tomography for Gibbs states
Yotam Y. Lifshitz, Eyal Bairey, E. Arbel +3 more·Dec 20, 2021
Quantum state tomography is an essential tool for the characterization and verification of quantum states. However, as it cannot be directly applied to systems with more than a few qubits, efficient tomography of larger states on mid-sized quantum de...
Mitigation of Crosstalk Errors in a Quantum Measurement and Its Applications
Seungchan Seo, J. Seong, J. Bae·Dec 20, 2021
In practical realizations of quantum information processing, there may exist noise in a measurement readout stage where errors appear not only on individual qubits but also on multiple ones collectively, the latter of which is called crosstalk errors...