Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Active robustness against the detuning-error for Rydberg quantum gates
Qing-Ling Hou, Han Wang, Jing Qian·Apr 18, 2024
Error suppression to the experimental imperfections is a central challenge for useful quantum computing. Recent studies have shown the advantages of using single-modulated pulses based on optimal control which can realize high-fidelity two-qubit gate...
Fidelity decay and error accumulation in random quantum circuits
Nadir Samos, Rafał Bistroń, Marcin Rudzi'nski +3 more·Apr 17, 2024
Fidelity decay captures the inevitable state degradation in any practical implementation of a quantum process. We devise bounds for the decay of fidelity for a generic evolution given by a random quantum circuit model that encompasses errors arising ...
Fault-tolerant quantum computing with the parity code and biased-noise qubits
A. Messinger, Valentin Torggler, Berend Klaver +2 more·Apr 17, 2024
We present a fault-tolerant universal quantum computing architecture based on a code concatenation of biased-noise qubits and the parity architecture. The parity architecture can be understood as a low-density parity-check code tailored specifically ...
Extension of Clifford Data Regression Methods for Quantum Error Mitigation
J. Pérez-Guijarro, A. Pagés-Zamora, J. Fonollosa·Apr 14, 2024
In addressing the challenge posed by noise in actual quantum devices, the application of quantum error mitigation techniques becomes essential. These techniques are resource-efficient, making them viable for implementation in noisy intermediate-scale...
Grover’s algorithm in a four-qubit silicon processor above the fault-tolerant threshold
I. Thorvaldson, D. Poulos, C. Moehle +15 more·Apr 12, 2024
Spin qubits in silicon are strong contenders for the realization of a practical quantum computer, having demonstrated single- and two-qubit gates with fidelities above the fault-tolerant threshold, and entanglement of three qubits. However, maintaini...
Benchmarking logical three-qubit quantum Fourier transform encoded in the Steane code on a trapped-ion quantum computer
K. Mayer, C. Ryan-Anderson, N. Brown +20 more·Apr 12, 2024
We implement logically encoded three-qubit circuits for the quantum Fourier transform (QFT), using the [[7,1,3]] Steane code, and benchmark the circuits on the Quantinuum H2-1 trapped-ion quantum computer. The circuits require multiple logical two-qu...
Benchmarking Digital Quantum Simulations Above Hundreds of Qubits Using Quantum Critical Dynamics
Alexander Miessen, Daniel J. Egger, I. Tavernelli +1 more·Apr 11, 2024
The real-time simulation of large many-body quantum systems is a formidable task, that may only be achievable with a genuine quantum computational platform. Currently, quantum hardware with a number of qubits sufficient to make classical emulation ch...
A Lightweight Protocol for Matchgate Fidelity Estimation
Jędrzej Burkat, Sergii Strelchuk·Apr 11, 2024
We present a low-depth randomised algorithm for the estimation of entanglement fidelity between an $n$-qubit matchgate circuit $\mathcal{U}$ and its noisy implementation $\mathcal{E}$. Our procedure makes use of a modified Pauli-Liouville representat...
Scalable Noise Characterization of Syndrome-Extraction Circuits with Averaged Circuit Eigenvalue Sampling
Evan T. Hockings, Andrew C. Doherty, Robin Harper·Apr 9, 2024
Characterizing the performance of noisy quantum circuits is central to the production of prototype quantum computers and can enable improved quantum error correction that exploits noise biases identified in a quantum device. We develop a scalable noi...
A quantum information theoretic analysis of reinforcement learning-assisted quantum architecture search
Abhishek Sadhu, Aritra Sarkar, Akash Kundu·Apr 9, 2024
In the field of quantum computing, variational quantum algorithms (VQAs) represent a pivotal category of quantum solutions across a broad spectrum of applications. These algorithms demonstrate significant potential for realising quantum computational...
Replication-Based Quantum Annealing Error Mitigation
H. Djidjev·Apr 9, 2024
Quantum annealers like those from D-Wave Systems implement adiabatic quantum computing to solve optimization problems, but their analog nature and limited control functionalities present challenges to correcting or mitigating errors. As quantum compu...
Towards Optimal Circuit Size for Sparse Quantum State Preparation
Rui Mao, Guojing Tian, Xiaoming Sun·Apr 8, 2024
Compared to general quantum states, the sparse states arise more frequently in the field of quantum computation. In this work, we consider the preparation for $n$-qubit sparse quantum states with $s$ non-zero amplitudes and propose two algorithms. Th...
Single-qubit rotation algorithm with logarithmic Toffoli count and gate depth
Christoffer Hindlycke, Jan-AAke Larsson·Apr 8, 2024
Building generic gates from a restricted gate set is a difficult but important problem, especially in the noisy regime where only a limited set of noise-resistant gates are available, e.g., fault-tolerant Clifford gates (generated by Hadamard, phase,...
Comparative Study of Quantum-Circuit Scalability in a Financial Problem
Jaewoong Heo, Moonjoo Lee·Apr 7, 2024
Quantum computer is extensively used in solving financial problems. Quantum amplitude estimation, an algorithm that aims to estimate the amplitude of a given quantum state, can be utilized to determine the expectation value of bonds as the logic intr...
Quantum querying based on multicontrolled Toffoli gates for causal Feynman loop configurations and directed acyclic graphs
S. Ram'irez-Uribe, Andr'es E. Renter'ia-Olivo, Germán Rodrigo·Apr 4, 2024
Quantum algorithms are a promising framework for unfolding the causal configurations of multiloop Feynman diagrams, which is equivalent to querying the \textit{directed acyclic graph} (DAG) configurations of undirected graphs in graph theory. In this...
Efficient Quantum Circuits for Non-Unitary and Unitary Diagonal Operators with Space-Time-Accuracy Trade-Offs
Julien Zylberman, Ugo Nzongani, Andrea Simonetto +1 more·Apr 3, 2024
Unitary and non-unitary diagonal operators are fundamental building blocks in quantum algorithms with applications in the resolution of partial differential equations, Hamiltonian simulations, the loading of classical data on quantum computers (quant...
Hamiltonian Simulation in the Interaction Picture Using the Magnus Expansion
Kunal Sharma, M. Tran·Apr 3, 2024
We propose an algorithm for simulating the dynamics of a geometrically local Hamiltonian $A$ under a small geometrically local perturbation $\alpha B$. In certain regimes, the algorithm achieves the optimal scaling and outperforms the state-of-the-ar...
Efficient implementation of multicontrolled quantum gates
Ben Zindorf, Sougato Bose·Apr 2, 2024
We present an implementation of multicontrolled () quantum gates that provides significant reductions of cost compared to state-of-the-art methods. The operator applied on the target qubit is a unitary, special unitary, or the Pauli X operator (multi...
Accurate and precise quantum computation of valence two-neutron systems
S. Yoshida, Takeshi Sato, Takumi Ogata +2 more·Apr 2, 2024
Developing methods to solve nuclear many-body problems with quantum computers is an imperative pursuit within the nuclear physics community. Here, we introduce a quantum algorithm to accurately and precisely compute the ground state of valence two-ne...
Pseudoentanglement Ain't Cheap
Sabee Grewal, Vishnu Iyer, William Kretschmer +1 more·Mar 29, 2024
We show that any pseudoentangled state ensemble with a gap of $t$ bits of entropy requires $\Omega(t)$ non-Clifford gates to prepare. This bound is tight up to polylogarithmic factors if linear-time quantum-secure pseudorandom functions exist. Our re...