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Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Phase estimation of local Hamiltonians on NISQ hardware
Laura Clinton, Johannes Bausch, Joel Klassen +1 more·Oct 26, 2021
In this work we investigate a binned version of quantum phase estimation (QPE) set out by Somma (2019 New J. Phys. 21 123025) and known as the quantum eigenvalue estimation problem (). Specifically, we determine whether the circuit decomposition tech...
Deterministic and Entanglement-Efficient Preparation of Amplitude-Encoded Quantum Registers
Prithvi Gundlapalli, Junyi Lee·Oct 26, 2021
Quantum computing promises to provide exponential speed-ups to certain classes of problems. In many such algorithms, a classical vector $\mathbf{b}$ is encoded in the amplitudes of a quantum state $\left |b \right>$. However, efficiently preparing $\...
Quantum description of reality is epistemically incomplete
Anubhav Chaturvedi, Marcin Pawłowski, Debashis Saha·Oct 25, 2021
We ask whether the operational quantum description is complete at the level of preparations: can the empirically accessible properties of a finite preparation set be reproduced exactly by a hidden-variable description, or must every such completion c...
Quantum Algorithms and Lower Bounds for Linear Regression with Norm Constraints
Yanlin Chen, R. D. Wolf·Oct 25, 2021
Lasso and Ridge are important minimization problems in machine learning and statistics. They are versions of linear regression with squared loss where the vector $\theta\in\mathbb{R}^d$ of coefficients is constrained in either $\ell_1$-norm (for Lass...
Quantum machine learning beyond kernel methods
S. Jerbi, Lukas J. Fiderer, Hendrik Poulsen Nautrup +3 more·Oct 25, 2021
Machine learning algorithms based on parametrized quantum circuits are prime candidates for near-term applications on noisy quantum computers. In this direction, various types of quantum machine learning models have been introduced and studied extens...
A Novel AQC Factoring Algorithm
M. Crawford·Oct 25, 2021
Due to recent technological advances, actual quantum devices are being constructed and used to perform computations. As a result, many classical problems are being restated so as to be solved on quantum computers. Some examples include satisfiability...
Quantum Crosstalk Analysis for Simultaneous Gate Operations on Superconducting Qubits
Peng Zhao, Kehuan Linghu, Zhiyuan Li +5 more·Oct 25, 2021
Maintaining or even improving gate performance with growing numbers of parallel controlled qubits is a vital requirement for fault-tolerant quantum computing. For superconducting quantum processors, though isolated one- or two-qubit gates have been d...
Fragmented imaginary-time evolution for early-stage quantum signal processors
T. L. Silva, M. M. Taddei, S. Carrazza +1 more·Oct 25, 2021
Simulating quantum imaginary-time evolution (QITE) is a significant promise of quantum computation. However, the known algorithms are either probabilistic (repeat until success) with unpractically small success probabilities or coherent (quantum ampl...
SWAP test for an arbitrary number of quantum states
Xavier Gitiaux, Ian Morris, M. Emelianenko +1 more·Oct 25, 2021
We develop a recursive algorithm to generalize the quantum SWAP test for an arbitrary number m of quantum states requiring O(m) controlled-swap (CSWAP) gates and O(logm)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepacka...
Efficient Parabolic Optimisation Algorithm for Adaptive VQE Implementations
V. Armaos, Dimitrios A. Badounas, Paraskevas Deligiannis +2 more·Oct 25, 2021
Computational chemistry is one of the most promising applications of quantum computing, mostly thanks to the development of the Variational Quantum Eigensolver (VQE) algorithm. VQE is being studied extensively and numerous optimisations of VQE’s sub-...
Discovering optimal fermion-qubit mappings through algorithmic enumeration
M. Chiew, Sergii Strelchuk·Oct 25, 2021
Simulating fermionic systems on a quantum computer requires a high-performing mapping of fermionic states to qubits. A characteristic of an efficient mapping is its ability to translate local fermionic interactions into local qubit interactions, lead...
Mixed-state TQFTs
Modjtaba Shokrian Zini, Zhenghan Wang·Oct 24, 2021
In this short note, we propose a generalization of Atiyah type TQFTs from pure states to mixed states in the sense that the Hilbert space of pure states associated to a space manifold is replaced by a quantum coherent space related to density matrice...
Quantum Computer Music: Foundations and Initial Experiments
E. Miranda, Suchitra Basak·Oct 24, 2021
Quantum computing is a nascent technology, which is advancing rapidly. There is a long history of research into using computers for music. Nowadays computers are absolutely essential for the music economy. Thus, it is very likely that quantum compute...
Variational quantum algorithm for Gaussian discrete solitons and their boson sampling
C. Conti·Oct 24, 2021
In the context of quantum information, highly nonlinear regimes, such as those supporting solitons, are marginally investigated. We miss general methods for quantum solitons, although they can act as entanglement generators or as self-organized quant...
Anonymous multi-party quantum computation with a third party
Zhaoxu Ji, Peiru Fan, Atta Ur Rahman +1 more·Oct 23, 2021
We reconsider and modify the second secure multi-party quantum addition protocol proposed in our original work. We show that the protocol is an anonymous multi-party quantum addition protocol rather than a secure multi-party quantum addition protocol...
Hidden variable model for quantum computation with magic states on qudits of any dimension
Michael Zurel, C. Okay, R. Raussendorf +1 more·Oct 23, 2021
It was recently shown that a hidden variable model can be constructed for universal quantum computation with magic states on qubits. Here we show that this result can be extended, and a hidden variable model can be defined for quantum computation wit...
TELET: A Monotonic Algorithm to Design Large Dimensional Equiangular Tight Frames for Applications in Compressed Sensing
R.Jyothi, P.Babu·Oct 23, 2021
An Equiangular tight frame (ETF) also known as the Welch-bound-equality sequences consists of a sequence of unit norm vectors whose absolute inner product is identical and minimal. Due to this unique property, these frames are preferred in different ...
Asymmetric Diamond Emitters for Unidirectional Photon Coupling
Satyajit Murmu, Avijit Kumar, R. Jha·Oct 23, 2021
The demand of single photon coupling to optical systems requires a suitable interface between negatively charged Nitrogen Vacancy (NV-) emitters in diamond to waveguides or optical circuits for applications in quantum network systems and in unidirect...
Error-Divisible Two-Qubit Gates
David Rodríguez Pérez, P. Varosy, Ziqian Li +3 more·Oct 22, 2021
We introduce a simple, widely applicable formalism for designing"error-divisible"two qubit gates: a quantum gate set where fractional rotations have proportionally reduced error compared to the full entangling gate. In current noisy intermediate-scal...
The role of cohomology in quantum computation with magic states
R. Raussendorf, C. Okay, Michael Zurel +1 more·Oct 22, 2021
A web of cohomological facts relates quantum error correction, measurement-based quantum computation, symmetry protected topological order and contextuality. Here we extend this web to quantum computation with magic states. In this computational sche...