Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Toward Constructing a Continuous Logical Operator for Error-Corrected Quantum Sensing
Cameron Cianci·Apr 30, 2023
Error correction has long been suggested to extend the sensitivity of quantum sensors into the Heisenberg Limit. However, operations on logical qubits are only performed through universal gate sets consisting of finite-sized gates such as Clifford+T....
Quantum Control Machine: The Limits of Control Flow in Quantum Programming
Charles Yuan, Agnes Villanyi, Michael Carbin·Apr 28, 2023
Quantum algorithms for tasks such as factorization, search, and simulation rely on control flow such as branching and iteration that depends on the value of data in superposition. High-level programming abstractions for control flow, such as switches...
Exact and approximate simulation of large quantum circuits on a single GPU
D. Strano, Benn Bollay, Aryan Blaauw +3 more·Apr 28, 2023
We benchmark the performances of Qrack, an open-source software library for the high-performance classical simulation of (gate-model) quantum computers. Qrack simulates, in the Schrödinger picture, the exact quantum state of $n$ qubits evolving under...
Optimal Layout Synthesis for Quantum Circuits as Classical Planning
Irfansha Shaik, J. Pol·Apr 24, 2023
In Layout Synthesis, the logical qubits of a quantum circuit are mapped to the physical qubits of a given quantum hardware platform, taking into account the connectivity of physical qubits. This involves inserting SWAP gates before an operation is ap...
Quantum Algorithmic Gate-Based Computing: Grover Quantum Search Algorithm Design in Quantum Software Engineering
S. Ulyanov, V. Ulyanov·Apr 20, 2023
The difference between classical and quantum algorithms (QA) is following: problem solved by QA is coded in the structure of the quantum operators. Input to QA in this case is always the same. Output of QA says which problem coded. In some sense, giv...
Sample-efficient Model-based Reinforcement Learning for Quantum Control
Irtaza Khalid, C. Weidner, E. Jonckheere +2 more·Apr 19, 2023
We propose a model-based reinforcement learning (RL) approach for noisy time-dependent gate optimization with improved sample complexity over model-free RL. Sample complexity is the number of controller interactions with the physical system. Leveragi...
Leakage in restless quantum gate calibration
Conrad J. Haupt, D. Egger·Apr 18, 2023
Quantum computers require high fidelity quantum gates. These gates are obtained by routine calibration tasks that eat into the availability of cloud-based devices. Restless circuit execution speeds-up characterization and calibration by foregoing qub...
Characterization, synthesis, and optimization of quantum circuits over multiple-control Z -rotation gates: A systematic study
Shihao Zhang, Junda Wu, Lvzhou Li·Apr 18, 2023
We conduct a systematic study of quantum circuits composed of multiple-control $Z$-rotation (MCZR) gates as primitives, since they are widely-used components in quantum algorithms and also have attracted much experimental interest in recent years. He...
Towards Advantages of Parameterized Quantum Pulses
Zhiding Liang, Jinglei Cheng, Zhixin Song +8 more·Apr 18, 2023
The advantages of quantum pulses over quantum gates have attracted increasing attention from researchers. Quantum pulses offer benefits such as flexibility, high fidelity, scalability, and real-time tuning. However, while there are established workfl...
Leakage Benchmarking for Universal Gate Sets
Bujiao Wu, Xiaoyang Wang, Xiao Yuan +2 more·Apr 16, 2023
Errors are common issues in quantum computing platforms, among which leakage is one of the most-challenging to address. This is because leakage, i.e., the loss of information stored in the computational subspace to undesired subspaces in a larger Hil...
High-fidelity two-qubit gates of hybrid superconducting-semiconducting singlet-triplet qubits
Maria Spethmann, S. Bosco, A. Hofmann +2 more·Apr 11, 2023
Hybrid systems comprising superconducting and semiconducting materials are promising architectures for quantum computing. Superconductors induce long-range interactions between the spin degrees of freedom of semiconducting quantum dots. These interac...
High-fidelity parallel entangling gates on a neutral-atom quantum computer
S. Evered, D. Bluvstein, M. Kalinowski +12 more·Apr 11, 2023
The ability to perform entangling quantum operations with low error rates in a scalable fashion is a central element of useful quantum information processing^ 1 . Neutral-atom arrays have recently emerged as a promising quantum computing platform, fe...
Majorization-based benchmark of the complexity of quantum processors
Alexandre B. Tacla, Nina Machado O'Neill, G. Carlo +2 more·Apr 10, 2023
Here, we propose the use of the majorization-based indicator for quantum computation complexity introduced in Vallejos et al. (Phys. Rev. A 104:012602, 2021) as a tool to benchmark the complexity within reach of quantum processors, when taking into a...
Neural-network-assisted quantum state and process tomography using limited data sets
Akshay Gaikwad, Omkar Bihani, Arvind +1 more·Apr 9, 2023
In this study we employ a feed-forward artificial neural network (FFNN) architecture to perform tomography of quantum states and processes obtained from noisy experimental data. To evaluate the performance of the FFNN, we use a heavily reduced data s...
Fourier expansion in variational quantum algorithms
Nikita A. Nemkov, E. Kiktenko, A. Fedorov·Apr 7, 2023
The Fourier expansion of the loss function in variational quantum algorithms (VQA) contains a wealth of information, yet is generally hard to access. We focus on the class of variational circuits, where constant gates are Clifford gates and parameter...
Intermediate-qudit assisted Improved quantum algorithm for string matching with an Advanced Decomposition of Fredkin gate
A. Saha, Om Khanna·Apr 6, 2023
The circuit-level implementation of a quantum string-matching algorithm, which matches a search string (pattern) of length $M$ inside a longer text of length $N$, has already been demonstrated in the literature to outperform its classical counterpart...
Dissipative Protection of a GKP Qubit in a High-Impedance Superconducting Circuit Driven by a Microwave Frequency Comb
Lev-Arcady Sellem·Apr 4, 2023
We propose a novel approach to generate, protect, and control Gottesman-Kitaev-Preskill (GKP) qubits. It employs a microwave frequency comb parametrically modulating a Josephson circuit to enforce a dissipative dynamics of a high-impedance circuit mo...
Quantum Algorithms for Charged Particle Track Reconstruction in the LUXE Experiment
Arianna Crippa, L. Funcke, T. Hartung +8 more·Apr 4, 2023
The LUXE experiment is a new experiment in planning in Hamburg, which will study quantum electrodynamics at the strong-field frontier. LUXE intends to measure the positron production rate in this unprecedented regime using, among others, a silicon tr...
Comparing planar quantum computing platforms at the quantum speed limit
Daniel Basilewitsch, Clemens Dlaska, W. Lechner·Apr 4, 2023
An important aspect that strongly impacts the experimental feasibility of quantum circuits is the ratio of gate times and typical error time scales. Algorithms with circuit depths that significantly exceed the error time scales will result in faulty ...
Break-even point of the phase-flip error correcting code
Áron Rozgonyi, Gábor Széchenyi·Mar 31, 2023
In this theoretical study, we explore the use of quantum code-based memories to enhance the lifetime of qubits and exceed the break-even point, which is critical for the implementation of fault-tolerant quantum computing. Specifically, we investigate...