Papers
Live trends in quantum computing research, updated daily from arXiv.
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15,673 papers in 12 months (-39% vs prior quarter)
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
High-fidelity laser-free universal control of trapped ion qubits
R. Srinivas, S. Burd, H. Knaack +9 more·Feb 24, 2021
Universal control of multiple qubits—the ability to entangle qubits and to perform arbitrary individual qubit operations1—is a fundamental resource for quantum computing2, simulation3 and networking4. Qubits realized in trapped atomic ions have shown...
Imaginary Time Propagation on a Quantum Chip
F. Turro, A. Roggero, Valentina Amitrano +5 more·Feb 24, 2021
Evolution in imaginary time is a prominent technique for finding the ground state of quantum many-body systems, and the heart of a number of numerical methods that have been used with great success in quantum chemistry, condensed matter and nuclear p...
Quantum Entropic Causal Inference
Mohammad Ali Javidian, V. Aggarwal, F. Bao +1 more·Feb 23, 2021
The class of problems in causal inference which seeks to isolate causal correlations solely from observational data even without interventions has come to the forefront of machine learning, neuroscience and social sciences. As new large scale quantum...
Ray-based framework for state identification in quantum dot devices
J. P. Zwolak, T. McJunkin, Sandesh S. Kalantre +4 more·Feb 23, 2021
Quantum dots (QDs) defined with electrostatic gates are a leading platform for a scalable quantum computing implementation. However, with increasing numbers of qubits, the complexity of the control parameter space also grows. Traditional measurement ...
Resource-efficient encoding algorithm for variational bosonic quantum simulations
Marco Majland, N. Zinner·Feb 23, 2021
Quantum algorithms are promising candidates for the enhancement of computational efficiency for a variety of computational tasks, allowing for the numerical study of physical systems intractable to classical computers. In the Noisy Intermediate Scale ...
Quantum computation for predicting electron and phonon properties of solids
K. Choudhary·Feb 23, 2021
Quantum chemistry is one of the most promising near-term applications of quantum computers. Quantum algorithms such as variational quantum eigen solver (VQE) and variational quantum deflation (VQD) algorithms have been mainly applied for molecular sy...
Quantum algorithm for quantum state discrimination via partial negation and weak measurement
D. Rizk, A. Younes·Feb 23, 2021
The quantum state discrimination problem is to distinguish between non-orthogonal quantum states. This problem has many applications in quantum information theory, quantum communication and quantum cryptography. In this paper, a quantum algorithm usi...
Charge-conserving unitaries typically generate optimal covariant quantum error-correcting codes
Linghang Kong, Zi-Wen Liu·Feb 23, 2021
Quantum error correction and symmetries play central roles in quantum information science and physics. It is known that quantum error-correcting codes covariant with respect to continuous symmetries cannot correct erasure errors perfectly (an importa...
Robust Control of Quantum Dynamics under Input and Parameter Uncertainty
Andrew Koswara, Vaibhav Bhutoria, R. Chakrabarti·Feb 23, 2021
Despite significant progress in theoretical and laboratory quantum control, engineering quantum systems remains principally challenging due to manifestation of noise and uncertainties associated with the field and Hamiltonian parameters. In this pape...
Probing quantum information propagation with out-of-time-ordered correlators
Jochen Braumuller, A. Karamlou, Y. Yanay +13 more·Feb 23, 2021
Interacting many-body quantum systems show a rich array of physical phenomena and dynamical properties, but are notoriously difficult to study: they are analytically challenging and exponentially hard to simulate on classical computers. Small-scale q...
Reassessing the computational advantage of quantum-controlled ordering of gates
Martin J. Renner, Č. Brukner·Feb 22, 2021
Research on indefinite causal structures is a rapidly evolving field that has a potential not only to make a radical revision of the classical understanding of space-time but also to achieve enhanced functionalities of quantum information processing....
Experimental implementation of quantum gates with one and two qubits using Nuclear Magnetic Resonance
J. Figueiredo·Feb 22, 2021
Nuclear Magnetic Ressonance (NMR) is a widely used technique, with a long history of applications in chemestry, medicine, and material science. Twenty years ago, it emerged as a reliable source for quantum computing too, since the work of Cory. One o...
Heisenberg-Limited Ground-State Energy Estimation for Early Fault-Tolerant Quantum Computers
Lin Lin, Yu Tong·Feb 22, 2021
Under suitable assumptions, the quantum phase estimation (QPE) algorithm is able to achieve Heisenberg-limited precision scaling in estimating the ground state energy. However, QPE requires a large number of ancilla qubits and large circuit depth, as...
Quantum query complexity with matrix-vector products
Andrew M. Childs, S. Hung, Tongyang Li·Feb 22, 2021
We study quantum algorithms that learn properties of a matrix using queries that return its action on an input vector. We show that for various problems, including computing the trace, determinant, or rank of a matrix or solving a linear system that ...
Subsystem analysis of continuous-variable resource states
Giacomo Pantaleoni, B. Baragiola, N. Menicucci·Feb 21, 2021
Continuous-variable (CV) cluster states are a universal resource for fault-tolerant quantum computation when supplemented with the Gottesman-Kitaev-Preskill (GKP) bosonic code. We generalize the recently introduced subsystem decomposition of a bosoni...
Classical simulation of bosonic linear-optical random circuits beyond linear light cone
Changhun Oh, Youngrong Lim, Bill Fefferman +1 more·Feb 19, 2021
Sampling from probability distributions of quantum circuits is a fundamentally and practically important task which can be used to demonstrate quantum supremacy using noisy intermediate-scale quantum devices. In the present work, we examine classical...
Exact Steady State of the Open XX -Spin Chain: Entanglement and Transport Properties
F. Benatti, R. Floreanini, L. Memarzadeh·Feb 19, 2021
We study the reduced dynamics of open quantum spin chains of arbitrary length N with nearest neighbour XX interactions, immersed within an external constant magnetic field along the z direction, whose end spins are weakly coupled to heat baths at dif...
Prospects of quantum computing for molecular sciences
Hongbin Liu, G. Low, Damian S. Steiger +3 more·Feb 19, 2021
Molecular science is governed by the dynamics of electrons and atomic nuclei, and by their interactions with electromagnetic fields. A faithful physicochemical understanding of these processes is crucial for the design and synthesis of chemicals and ...
Approximations in Transmon Simulation
Tyler Jones, Kaiah Steven, Xavier Poncini +2 more·Feb 19, 2021
Classical simulations of time-dependent quantum systems are widely used in quantum control research. In particular, these simulations are commonly used to host iterative optimal control algorithms. This is convenient for algorithms that are too onero...
Quantum Gate Pattern Recognition and Circuit Optimization for Scientific Applications
Wonho Jang, K. Terashi, M. Saito +7 more·Feb 19, 2021
There is no unique way to encode a quantum algorithm into a quantum circuit. With limited qubit counts, connectivities, and coherence times, circuit optimization is essential to make the best use of quantum devices produced over a next decade. We int...