Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Optimizing Quantum Federated Learning Based on Federated Quantum Natural Gradient Descent
Jun Qi, Xiao-Lei Zhang, Javier Tejedor·Feb 27, 2023
Quantum federated learning (QFL) is a quantum extension of the classical federated learning model across multiple local quantum devices. An efficient optimization algorithm is always expected to minimize the communication overhead among different qua...
Repeated Purification versus Concatenated Error Correction in Fault Tolerant Quantum Networks
M. Barbeau, Joaquín García, E. Kranakis·Feb 27, 2023
Entanglement distribution is a core mechanism for the future quantum Internet. The quantum world is, however, a faulty environment. Hence, successful entanglement swapping is error-prone. The occurrence of quantum state errors can be mitigated using ...
Engineering of niobium surfaces through accelerated neutral atom beam technology for quantum applications
S. Kar, C. Weiland, Chenyu Zhou +16 more·Feb 27, 2023
A major roadblock to scalable quantum computing is phase decoherence and energy relaxation caused by qubits interacting with defect-related two-level systems (TLSs). Native oxides present on the surfaces of superconducting metals used in quantum devi...
Assisted quantum simulation of open quantum systems
Jin‐Min Liang, Qiao-Qiao Lv, Zhixi Wang +1 more·Feb 26, 2023
Summary Universal quantum algorithms (UQA) implemented on fault-tolerant quantum computers are expected to achieve an exponential speedup over classical counterparts. However, the deep quantum circuits make the UQA implausible in the current era. Wit...
Quantum metrology algorithms for dark matter searches with clocks
M. H. Zaheer, N. Matjelo, D. Hume +2 more·Feb 25, 2023
Quantum algorithms such as dynamical decoupling can be used to improve the sensitivity of a quantum sensor to a signal while suppressing sensitivity to noise. Atomic clocks are among the most sensitive quantum sensors, with recent improvements in clo...
Protecting entanglement between logical qubits via quantum error correction
W. Cai, X. Mu, Weiting Wang +11 more·Feb 25, 2023
Entanglement is one of the most important resources in quantum computing, cryptography and sensing. However, entanglement is also fragile, and its potential advantages are hindered by decoherence effects in experiments. Here we experimentally realize...
Floquet analysis of frequency collisions
K. Heya, Moein Malekakhlagh, S. Merkel +2 more·Feb 24, 2023
Implementation of high-fidelity gate operations on integrated-qubit systems is of vital importance for fault-tolerant quantum computation. Qubit frequency allocation is an essential part of improving control fidelity. A metric for qubit frequency all...
Wigner state and process tomography on near-term quantum devices
A. Devra, N. J. Glaser, Dennis Huber +1 more·Feb 24, 2023
We present an experimental scanning-based tomography approach for near-term quantum devices. The underlying method has previously been introduced in an ensemble-based NMR setting. Here we provide a tutorial-style explanation along with suitable softw...
Preparing random state for quantum financing with quantum walks
Yen-Jui Chang, Wei-Ting Wang, Haotian Chen +2 more·Feb 24, 2023
In recent years, there has been an emerging trend of combining two innovations in computer science and physics to achieve better computation capability. Exploring the potential of quantum computation to achieve highly efficient performance in various...
All optical operation of a superconducting photonic interface.
Fred Thiele, T. Hummel, A. McCaughan +7 more·Feb 23, 2023
Quantum photonic processing via electro-optic components typically requires electronic links across different operation environments, especially when interfacing cryogenic components such as superconducting single photon detectors with room-temperatu...
Stabilizer Approximation II: From H$_2$O To C$_6$H$_6$
Jianan Wang, Chuixiong Wu, Fen Zuo·Feb 23, 2023
We apply the stabilizer method to the study of some complicated molecules, such as water and benzene. In the minimal STO-3G basis, the former requires 14 qubits, and the latter 72 qubits, which is very challenging. Quite remarkably, We are still able...
Completeness for arbitrary finite dimensions of ZXW-calculus, a unifying calculus
Boldizsár Poór, Quanlong Wang, R. A. Shaikh +3 more·Feb 23, 2023
The ZX-calculus is a universal graphical language for qubit quantum computation, meaning that every linear map between qubits can be expressed in the ZX-calculus. Furthermore, it is a complete graphical rewrite system: any equation involving linear m...
Robust suppression of noise propagation in GKP error-correction
C. Siegele, P. Campagne-Ibarcq·Feb 23, 2023
Straightforward logical operations contrasting with complex state preparation are the hallmarks of the bosonic encoding proposed by Gottesman, Kitaev and Preskill (GKP). The recently reported generation and error-correction of GKP qubits in trapped i...
Using Cryogenic CMOS Control Electronics to Enable a Two-Qubit Cross-Resonance Gate
D. Underwood, J. Glick, K. Inoue +18 more·Feb 22, 2023
Qubit control electronics composed of CMOS circuits are of critical interest for next generation quantum computing systems. A CMOS-based application specific integrated circuit (ASIC) fabricated in 14nm FinFET technology was used to generate and sequ...
Quantum-Selected Configuration Interaction: classical diagonalization of Hamiltonians in subspaces selected by quantum computers
Keita Kanno, M. Kohda, R. Imai +4 more·Feb 22, 2023
We propose quantum-selected configuration interaction (QSCI), a class of hybrid quantum-classical algorithms for calculating the ground- and excited-state energies of many-electron Hamiltonians on noisy quantum devices. Suppose that an approximate gr...
Quantum spherical codes
Shubham P. Jain, Joseph T. Iosue, A. Barg +1 more·Feb 22, 2023
As with classical computers, quantum computers require error-correction schemes to reliably perform useful large-scale calculations. The nature and frequency of errors depends on the quantum computing platform, and although there is a large literatur...
Decoding probabilistic syndrome measurement and the role of entropy
J. F. Doriguello·Feb 22, 2023
In realistic stabiliser-based quantum error correction there are many ways in which real physical systems deviate from simple toy models of error. Stabiliser measurements may not always be deterministic or may suffer from erasure errors, such that th...
Obfuscation of Pseudo-Deterministic Quantum Circuits
James Bartusek, Fuyuki Kitagawa, R. Nishimaki +1 more·Feb 22, 2023
We show how to obfuscate pseudo-deterministic quantum circuits, assuming the quantum hardness of learning with errors (QLWE) and post-quantum virtual black-box (VBB) obfuscation for classical circuits. Given the classical description of a quantum cir...
Error-mitigated quantum simulation of interacting fermions with trapped ions
Wentao Chen, Shuaining Zhang, Jialiang Zhang +7 more·Feb 21, 2023
Quantum error mitigation has been extensively explored to increase the accuracy of the quantum circuits in noisy-intermediate-scale-quantum (NISQ) computation, where quantum error correction requiring additional quantum resources is not adopted. Amon...
Post-fabrication frequency trimming of coplanar-waveguide resonators in circuit QED quantum processors
S. Vallés-Sanclemente, S. L. M. van der Meer, M. Finkel +9 more·Feb 21, 2023
We present the use of a set of airbridges to trim the frequency of microwave coplanar-waveguide (CPW) resonators post-fabrication. This method is compatible with the fabrication steps of conventional CPW airbridges and crossovers and increases device...