Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
MORE: Measurement and Correlation Based Variational Quantum Circuit for Multi-Classification
Jindi Wu, Tianjie Hu, Qun Li·Jul 21, 2023
Quantum computing has shown considerable promise for compute-intensive tasks in recent years. For instance, classification tasks based on quantum neural networks (QNN) have garnered significant interest from researchers and have been evaluated in var...
Scalable tensor-network error mitigation for near-term quantum computing
Sergei E. Filippov, Matea Leahy, M. Rossi +1 more·Jul 21, 2023
Until fault-tolerance becomes implementable at scale, quantum computing will heavily rely on noise mitigation techniques. While methods such as zero noise extrapolation with probabilistic error amplification (ZNE-PEA) and probabilistic error cancella...
Robust ground-state energy estimation under depolarizing noise
Zhiyan Ding, Yulong Dong, Yu Tong +1 more·Jul 20, 2023
We present a novel ground-state energy estimation algorithm that is robust under global depolarizing error channels. Building upon the recently developed Quantum Exponential Least Squares (QCELS) algorithm, our new approach incorporates significant a...
Fault-tolerant computing with single-qudit encoding in a molecular spin.
Matteo Mezzadri, A. Chiesa, L. Lepori +1 more·Jul 20, 2023
We show that molecular spins represent ideal materials to realize a fault-tolerant quantum computer, in which all quantum operations include protection against leading (dephasing) errors. This is achieved by pursuing a qudit approach, in which logica...
Special features of the Weyl–Heisenberg Bell basis imply unusual entanglement structure of Bell-diagonal states
Christopher Popp, B. Hiesmayr·Jul 20, 2023
Bell states are of crucial importance for entanglement based methods in quantum information science. Typically, a standard construction of a complete orthonormal Bell-basis by Weyl–Heisenberg operators is considered. We show that the group structure ...
Time-optimal multi-qubit gates: Complexity, efficient heuristic and gate-time bounds
Pascal Bassler, Markus Heinrich, M. Kliesch·Jul 20, 2023
Multi-qubit entangling interactions arise naturally in several quantum computing platforms and promise advantages over traditional two-qubit gates. In particular, a fixed multi-qubit Ising-type interaction together with single-qubit X-gates can be us...
Robust sparse IQP sampling in constant depth
Louis Paletta, Anthony Leverrier, A. Sarlette +2 more·Jul 20, 2023
Between NISQ (noisy intermediate scale quantum) approaches without any proof of robust quantum advantage and fully fault-tolerant quantum computation, we propose a scheme to achieve a provable superpolynomial quantum advantage (under some widely acce...
Floquetifying the Colour Code
Alex Townsend-Teague, J. M. D. L. Fuente, Markus S. Kesselring·Jul 20, 2023
Floquet codes are a recently discovered type of quantum error correction code. They can be thought of as generalising stabilizer codes and subsystem codes, by allowing the logical Pauli operators of the code to vary dynamically over time. In this wor...
Adaptive Trotterization for Time-Dependent Hamiltonian Quantum Dynamics Using Piecewise Conservation Laws.
Hongzheng Zhao, M. Bukov, M. Heyl +1 more·Jul 19, 2023
Digital quantum simulation relies on Trotterization to discretize time evolution into elementary quantum gates. On current quantum processors with notable gate imperfections, there is a critical trade-off between improved accuracy for finer time step...
Projective Measurement-Based Quantum Phase Difference Estimation Algorithm for the Direct Computation of Eigenenergy Differences on a Quantum Computer
K. Sugisaki·Jul 19, 2023
Quantum computers are capable of calculating the energy difference of two electronic states using the quantum phase difference estimation (QPDE) algorithm. The Bayesian inference-based implementations for the QPDE have been reported so far, but in th...
The effect of classical optimizers and Ansatz depth on QAOA performance in noisy devices
Aidan Pellow-Jarman, Shane McFarthing, I. Sinayskiy +3 more·Jul 19, 2023
The Quantum Approximate Optimization Algorithm (QAOA) is a variational quantum algorithm for Near-term Intermediate-Scale Quantum computers (NISQ) providing approximate solutions for combinatorial optimization problems. The QAOA utilizes a quantum-cl...
A Novel Spatial-Temporal Variational Quantum Circuit to Enable Deep Learning on NISQ Devices
Jinyang Li, Zhepeng Wang, Zhirui Hu +3 more·Jul 19, 2023
Quantum computing presents a promising approach for machine learning with its capability for extremely parallel computation in high-dimension through superposition and entanglement. Despite its potential, existing quantum learning algorithms, such as...
Quantum computation from dynamic automorphism codes
M. Davydova, Nathanan Tantivasadakarn, Shankar Balasubramanian +1 more·Jul 19, 2023
We propose a new model of quantum computation comprised of low-weight measurement sequences that simultaneously encode logical information, enable error correction, and apply logical gates. These measurement sequences constitute a new class of quantu...
Ultrafast all-electrical universal nanoqubits
D. T. Perkins, Aires Ferreira·Jul 19, 2023
We propose how to create, control, and read-out real-space localized spin qubits in proximitized finite graphene nanoribbon (GNR) systems using purely electrical methods. Our proposed nano-qubits are formed of in-gap singlet-triplet states that emerg...
On quantum annealing without a physical quantum annealer
Ameya Bhave, Ajinkya Borle·Jul 19, 2023
Quantum annealing is an emerging metaheuristic used for solving combinatorial optimisation problems. However, hardware based physical quantum annealers are primarily limited to a single vendor. As an alternative, we can discretise the quantum anneali...
Mitigation of quantum crosstalk in cross-resonance-based qubit architectures
Peng Zhao·Jul 19, 2023
The Cross-resonance (CR) gate architecture that exploits fixed-frequency transmon qubits and fixed couplings is a leading candidate for quantum computing. Nonetheless, without the tunability of qubit parameters such as qubit frequencies and couplings...
The Qudit ZH-Calculus: Generalised Toffoli+Hadamard and Universality
Patrick Roy, J. Wetering, L. Yeh·Jul 19, 2023
We introduce the qudit ZH-calculus and show how to generalise all the phase-free qubit rules to qudits. We prove that for prime dimensions d, the phase-free qudit ZH-calculus is universal for matrices over the ring Z[e^2(pi)i/d]. For qubits, there is...
Tangling Schedules Eases Hardware Connectivity Requirements for Quantum Error Correction
G. P. Gehér, O. Crawford, E. Campbell·Jul 19, 2023
Quantum computers have the potential to change the way we solve computational problems. Due to the noisy nature of qubits, the need arises to correct physical errors occurring during computation. The surface code is a promising candidate for such err...
Generating probability distributions using variational quantum circuits
Ronit Raj, Kshitij Durge, Manish Mallapur +2 more·Jul 18, 2023
Sampling from a probability distribution is a core task in many quantum and classical algorithms. Variational quantum circuits provide a natural approach to generating such distributions, as measurement outcomes directly define the probability values...
A Cryogenic Memristive Neural Decoder for Fault-tolerant Quantum Error Correction
Fr'ed'eric Marcotte, Pierre-Antoine Mouny, Victor Yon +6 more·Jul 18, 2023
Neural decoders for quantum error correction (QEC) rely on neural networks to classify syndromes extracted from error correction codes and find appropriate recovery operators to protect logical information against errors. Its ability to adapt to hard...