Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Levy-Lieb embedding of density-functional theory and its quantum kernel: Illustration for the Hubbard dimer using near-term quantum algorithms
C. D. Pemmaraju, Amol Deshmukh·Jul 19, 2022
The constrained-search formulation of Levy and Lieb provides a concrete mapping from N representable densities to the space of N -particle wavefunctions and explicitly defines the universal functional of density functional theory. We numerically imple...
Finite-temperature tensor network study of the Hubbard model on an infinite square lattice
Aritra Sinha, M. Rams, Piotr Czarnik +1 more·Jul 19, 2022
The Hubbard model is a longstanding problem in the theory of strongly correlated electrons and a very active one in the experiments with ultracold fermionic atoms. Motivated by current and prospective quantum simulations, we apply a two-dimensional t...
Controlled quantum dot array segmentation via highly tunable interdot tunnel coupling
M. Nurizzo, B. Jadot, P. Mortemousque +8 more·Jul 19, 2022
Recent demonstrations using electron spins stored in quantum dot array as qubits are promising for developing a scalable quantum computing platform. An ongoing effort is, therefore, aiming at the precise control of the quantum dot parameters in large...
Limits to Quantum Gate Fidelity from Near-Field Thermal and Vacuum Fluctuations
Wenbo Sun, S. Bharadwaj, Li‐Ping Yang +5 more·Jul 19, 2022
High-fidelity quantum gate operations are essential for achieving scalable quantum circuits. In spin qubit quantum computing systems, metallic gates and antennas which are necessary for qubit operation, initialization, and readout, also cause detrime...
Playing Mastermind on quantum computers
Lvzhou Li, Jingquan Luo, Yongzhen Xu·Jul 19, 2022
From the 1970s up to now, Mastermind, a classic two-player game, has attracted plenty of attention, not only from the public as a popular game, but also from the academic community as a scientific issue. Mastermind with n positions and k colors is fo...
Maximizing Entanglement Routing Rate in Quantum Networks: Approximation Algorithms
Dung H. P. Nguyen, Ethan Hunt, Dillon J. Horton +2 more·Jul 19, 2022
There will be a fast-paced shift from conventional network systems to novel quantum networks that are supported by the quantum entanglement and teleportation, key technologies of the quantum era, to enable secured data transmissions in the next-gener...
Quantum Image Representation Methods Using Qutrits
Ankit Khandelwal, M. Chandra·Jul 19, 2022
—Quantum Image Processing is a recent highlight in the quantum computing field. All previous methods for representing the images as quantum states were defined using qubits. One Quantum Image Representation (QIR) method using qutrits is present in the ...
Control and mitigation of microwave crosstalk effect with superconducting qubits
Ruixia Wang, Peng Zhao, Yirong Jin +1 more·Jul 18, 2022
Improving gate performance is vital for scalable quantum computing. Universal quantum computing also requires gate fidelity to reach a high level. For a superconducting quantum processor, which operates in the microwave band, the single-qubit gates a...
Time-Efficient Constant-Space-Overhead Fault-Tolerant Quantum Computation
H. Yamasaki, M. Koashi·Jul 18, 2022
Scaling up quantum computers to attain substantial speedups over classical computing requires fault tolerance. Conventionally, protocols for fault-tolerant quantum computation demand excessive space overheads by using many physical qubits for each lo...
Constant-cost implementations of Clifford operations and multiply controlled gates using global interactions
S. Bravyi, D. Maslov, Y. Nam·Jul 18, 2022
We consider quantum circuits composed of single-qubit operations and global entangling gates generated by Ising-type Hamiltonians. It is shown that such circuits can implement a large class of unitary operators commonly used in quantum algorithms at ...
Approximate Quantum Algorithms as a Multiphoton Raman Excitation of a Quasicontinuum Edge
A. Mandilara, D. Fedotov, V. Akulin·Jul 18, 2022
Many quantum algorithms can be seen as a transition from a well-defined initial quantum state of a complex quantum system, to an unknown target quantum state, corresponding to a certain eigenvalue either of the Hamiltonian or of a transition operator...
The complexity of quantum circuit mapping with fixed parameters
P. Zhu, Shenggen Zheng, Lihuan Wei +3 more·Jul 18, 2022
A quantum circuit must be preprocessed before implementing on NISQ devices due to the connectivity constraint. Quantum circuit mapping (QCM) transforms the circuit into an equivalent one that is compliant with the NISQ device’s architecture constrain...
A Sublinear-Time Quantum Algorithm for Approximating Partition Functions
A. Cornelissen, Yassine Hamoudi·Jul 18, 2022
We present a novel quantum algorithm for estimating Gibbs partition functions in sublinear time with respect to the logarithm of the size of the state space. This is the first speed-up of this type to be obtained over the seminal nearly-linear time a...
Benchmarking quantum logic operations relative to thresholds for fault tolerance
A. Hashim, Stefan K. Seritan, T. Proctor +6 more·Jul 18, 2022
Contemporary methods for benchmarking noisy quantum processors typically measure average error rates or process infidelities. However, thresholds for fault-tolerant quantum error correction are given in terms of worst-case error rates—defined via the...
Amplitude Estimation from Quantum Signal Processing
Patrick Rall, Bryce Fuller·Jul 18, 2022
Amplitude estimation algorithms are based on Grover's algorithm: alternating reflections about the input state and the desired outcome. But what if we are given the ability to perform arbitrary rotations, instead of just reflections? In this situatio...
Calculation of the moscovium ground‐state energy by quantum algorithms
V. Zaytsev, M. E. Groshev, I. A. Maltsev +2 more·Jul 17, 2022
We investigate the possibility to calculate the ground‐state energy of the atomic systems on a quantum computer. For this purpose we evaluate the lowest binding energy of the moscovium atom with the use of the iterative phase estimation and variation...
Calibration-Aware Transpilation for Variational Quantum Optimization
Yanjun Ji, Sebastian Brandhofer, I. Polian·Jul 17, 2022
Today’s Noisy Intermediate-Scale Quantum (NISQ) computers support only limited sets of available quantum gates and restricted connectivity. Therefore, quantum algorithms must be transpiled in order to become executable on a given NISQ computer; trans...
Statistically characterizing robustness and fidelity of quantum controls and quantum control algorithms
Irtaza Khalid, C. Weidner, E. Jonckheere +2 more·Jul 16, 2022
Robustness of quantum operations or controls is important to build reliable quantum devices. The robustness-infidelity measure (RIM$_p$) is introduced to statistically quantify the robustness and fidelity of a controller as the p-order Wasserstein di...
Quantum Noise-Induced Reservoir Computing
T. Kubota, Yudai Suzuki, Shumpei Kobayashi +3 more·Jul 16, 2022
Quantum computing has been moving from a theoretical phase to practical one, presenting daunting challenges in implementing physical qubits, which are subjected to noises from the surrounding environment. These quantum noises are ubiquitous in quantu...
Nonclassical Advantage in Metrology Established via Quantum Simulations of Hypothetical Closed Timelike Curves.
D. Arvidsson-Shukur, Aidan G. McConnell, Nicole Yunger Halpern·Jul 15, 2022
We construct a metrology experiment in which the metrologist can sometimes amend the input state by simulating a closed timelike curve, a worldline that travels backward in time. The existence of closed timelike curves is hypothetical. Nevertheless, ...