Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
T-count optimization of approximate quantum Fourier transform
Byeongyong Park, D. Ahn·Mar 15, 2022
The quantum Fourier transform (QFT) is a ubiquitous quantum operation that is used in numerous quantum computing applications. The major obstacle to constructing a QFT circuit is that numerous elementary gates are required. Among the elementary gates...
Memristor-Based Cryogenic Programmable DC Sources for Scalable In Situ Quantum-Dot Control
Pierre-Antoine Mouny, Y. Beilliard, S'ebastien Graveline +8 more·Mar 14, 2022
Current quantum systems based on spin qubits are controlled by classical electronics located outside the cryostat. This approach creates a major wiring bottleneck, which is one of the main roadblocks toward scalable quantum computers. Thus, we propos...
Effective nonlocal parity-dependent couplings in qubit chains
M. Nägele, C. Schweizer, F. Roy +1 more·Mar 14, 2022
For the efficient implementation of quantum algorithms, practical ways to generate many-body entanglement are a basic requirement. Specifically, coupling multiple qubit pairs at once can be advantageous and can lead to multi-qubit operations useful i...
Memory Compression with Quantum Random-Access Gates
H. Buhrman, B. Loff, Subhasree Patro +1 more·Mar 10, 2022
In the classical RAM, we have the following useful property. If we have an algorithm that uses $M$ memory cells throughout its execution, and in addition is sparse, in the sense that, at any point in time, only $m$ out of $M$ cells will be non-zero, ...
Circuit connectivity boosts by quantum-classical-quantum interfaces
R. Wiersema, L. Guerini, J. Carrasquilla +1 more·Mar 9, 2022
High-connectivity circuits are a major roadblock for current quantum hardware. We propose a hybrid classical-quantum algorithm to simulate such circuits without swap-gate ladders. As main technical tool, we introduce quantum-classical-quantum interfa...
Parameterized Two‐Qubit Gates for Enhanced Variational Quantum Eigensolver
S. E. Rasmussen, N. Zinner·Mar 9, 2022
The variational quantum eigensolver is a prominent hybrid quantum‐classical algorithm expected to impact near‐term quantum devices. They are usually based on a circuit ansatz consisting of parameterized single‐qubit gates and fixed two‐qubit gates. T...
Quantum algorithm for neural network enhanced multi-class parallel classification
Anqi Zhang, Xiaoyun He, Sheng-mei Zhao·Mar 8, 2022
Using the properties of quantum superposition, we propose a quantum classification algorithm to efficiently perform multi-class classification tasks, where the training data are loaded into parameterized operators which are applied to the basis of th...
Efficient quantum gate decomposition via adaptive circuit compression
P. Rakyta, Z. Zimbor'as·Mar 8, 2022
In this work, we report on a novel quantum gate approximation algorithm based on the application of parametric two-qubit gates in the synthesis process. The utilization of these parametric two-qubit gates in the circuit design allows us to transform ...
Hardware-tailored diagonalization circuits
Daniel Miller, Laurin E. Fischer, Kyano Levi +5 more·Mar 7, 2022
A central building block of many quantum algorithms is the diagonalization of Pauli operators. Although it is always possible to construct a quantum circuit that simultaneously diagonalizes a given set of commuting Pauli operators, only resource-effi...
Quantum computation with cat qubits
Jérémie Guillaud, Joachim Cohen, M. Mirrahimi·Mar 7, 2022
These are the lecture notes from the 2019 Les Houches Summer School on “Quantum Information Machines”. After a brief introduction to quantum error correction and bosonic codes, we focus on the case of cat qubits stabilized by a nonlinear multi-photon...
Quantum algorithms for grid-based variational time evolution
Pauline J. Ollitrault, Sven Jandura, Alexander Miessen +4 more·Mar 4, 2022
The simulation of quantum dynamics calls for quantum algorithms working in first quantized grid encodings. Here, we propose a variational quantum algorithm for performing quantum dynamics in first quantization. In addition to the usual reduction in c...
Quantum Algorithms for Estimating Quantum Entropies
Youle Wang, Benchi Zhao, Xin Wang·Mar 4, 2022
The von Neumann and quantum R\'enyi entropies characterize fundamental properties of quantum systems and lead to theoretical and practical applications in many fields. Quantum algorithms for estimating quantum entropies, using a quantum query model t...
Quantum circuit compilation and hybrid computation using Pauli-based computation
F. C. R. Peres, E. Galvão·Mar 3, 2022
Pauli-based computation (PBC) is driven by a sequence of adaptively chosen, non-destructive measurements of Pauli observables. Any quantum circuit written in terms of the Clifford+T gate set and having tT gates can be compiled into a PBC on t qubits....
Rydberg Wire Gates for Universal Quantum Computation
Seokho Jeong, Xiao-Feng Shi, Minhyuk Kim +1 more·Mar 3, 2022
Rydberg atom arrays offer flexible geometries of strongly interacting neutral atoms, which are useful for many quantum applications such as quantum simulation and quantum computation. Here, we consider an all-optical gate-based quantum computing sche...
CAFQA: A Classical Simulation Bootstrap for Variational Quantum Algorithms
Gokul Subramanian Ravi, P. Gokhale, Yi Ding +7 more·Feb 25, 2022
Classical computing plays a critical role in the advancement of quantum frontiers in the NISQ era. In this spirit, this work uses classical simulation to bootstrap Variational Quantum Algorithms (VQAs). VQAs rely upon the iterative optimization of a ...
Parametrized Constant-Depth Quantum Neuron
Jonathan H. A. de Carvalho, Fernando M. de Paula Neto·Feb 25, 2022
Quantum computing has been revolutionizing the development of algorithms. However, only noisy intermediate-scale quantum devices are available currently, which imposes several restrictions on the circuit implementation of quantum algorithms. In this ...
Universal Classical Optical Computing Inspired by Quantum Information Process
Yifan Sun, Qian Li, Ling‐Jun Kong +2 more·Feb 22, 2022
Quantum computing has attracted much attention in recent decades, since it is believed to solve certain problems substantially faster than traditional computing methods. Theoretically, such an advance can be obtained by networks of the quantum operat...
Towards Quantum Gates with Wide Operating Margins
R. Epstein·Feb 21, 2022
Scaling up quantum computing hardware is hindered by the narrow operating margins of current quantum components. Here, we introduce a composite qubit and gate scheme that achieves wide margins by use of transistor-like nonlinearities to suppress the ...
Qutrit Metaplectic Gates Are a Subset of Clifford+T
A. Glaudell, N. J. Ross, J. Wetering +1 more·Feb 18, 2022
A popular universal gate set for quantum computing with qubits is Clifford+T, as this can be readily implemented on many fault-tolerant architectures. For qutrits, there is an equivalent T gate, that, like its qubit analogue, makes Clifford+T approxi...
Quantum Neuron with Separable-State Encoding
London Cavaletto, L. Candelori, A. Matos-Abiague·Feb 16, 2022
The use of advanced quantum neuron models for pattern recognition applications requires fault tolerance. Therefore, it is not yet possible to test such models on a large scale in currently available quantum processors. As an alternative, we propose a...