Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Noise-Adaptive Compiler Mappings for Noisy Intermediate-Scale Quantum Computers
Prakash Murali, Jonathan M. Baker, Ali Javadi-Abhari +2 more·Jan 30, 2019
A massive gap exists between current quantum computing (QC) prototypes, and the size and scale required for many proposed QC algorithms. Current QC implementations are prone to noise and variability which affect their reliability, and yet with less t...
Decoding surface code with a distributed neural network–based decoder
Savvas Varsamopoulos, K. Bertels, C. G. Almudéver·Jan 30, 2019
There has been a rise in decoding quantum error correction codes with neural network–based decoders, due to the good decoding performance achieved and adaptability to any noise model. However, the main challenge is scalability to larger code distance...
Quantum Associative Memory in Hep Track Pattern Recognition
I. Shapoval, P. Calafiura·Jan 29, 2019
We have entered the Noisy Intermediate-Scale Quantum Era. A plethora of quantum processor prototypes allow evaluation of potential of the Quantum Computing paradigm in applications to pressing computational problems of the future. Growing data input ...
ReQWIRE: Reasoning about Reversible Quantum Circuits
Robert Rand, Jennifer Paykin, Dong-Ho Lee +1 more·Jan 29, 2019
Common quantum algorithms make heavy use of ancillae: scratch qubits that are initialized at some state and later returned to that state and discarded. Existing quantum circuit languages let programmers assert that a qubit has been returned to the |0...
Iterative methods for computing U-eigenvalues of non-symmetric complex tensors with application in quantum entanglement
Mengshi Zhang, Guyan Ni, Guofeng Zhang·Jan 28, 2019
The purpose of this paper is to study the problem of computing unitary eigenvalues (U-eigenvalues) of non-symmetric complex tensors. By means of symmetric embedding of complex tensors, the relationship between U-eigenpairs of a non-symmetric complex ...
Heisenberg-limited single-mode quantum metrology in a superconducting circuit
Wei Wang, Yi Wu, Yi Wu +12 more·Jan 28, 2019
Two-mode interferometers lay the foundations for quantum metrology. Instead of exploring quantum entanglement in the two-mode interferometers, a single bosonic mode also promises a measurement precision beyond the shot-noise limit (SNL) by taking adv...
Heisenberg-scaling measurement protocol for analytic functions with quantum sensor networks.
Kevin Qian, Zachary Eldredge, Wenchao Ge +4 more·Jan 25, 2019
We generalize past work on quantum sensor networks to show that, for d input parameters, entanglement can yield a factor O(d) improvement in mean-squared error when estimating an analytic function of these parameters. We show that the protocol is opt...
Quantum Interference of Electromechanically Stabilized Emitters in Nanophotonic Devices
B. Machielse, S. Bogdanović, S. Meesala +15 more·Jan 25, 2019
Photon-mediated coupling between distant matter qubits may enable secure communication over long distances, the implementation of distributed quantum computing schemes, and the exploration of new regimes of many-body quantum dynamics. Nanophotonic de...
Simulation of qubit quantum circuits via Pauli propagation
Patrick Rall, Daniel Liang, Jeremy Cook +1 more·Jan 25, 2019
We present novel algorithms to estimate outcomes for qubit quantum circuits. Notably, these methods can simulate a Clifford circuit in linear time without ever writing down stabilizer states explicitly. These algorithms outperform previous noisy near...
Approximating power of machine-learning ansatz for quantum many-body states
A. Borin, D. Abanin·Jan 24, 2019
An artificial neural network (ANN) with the restricted Boltzmann machine (RBM) architecture was recently proposed as a versatile variational quantum many-body wave function. In this work we provide physical insights into the performance of this ansat...
QRunes: High-Level Language for Quantum-Classical Hybrid Programming
Zhao-Yun Chen, G. Guo·Jan 24, 2019
Hybrid quantum-classical algorithms have drawn much attention because of their potential to realize the "quantum advantage" in noisy, intermediate-scale quantum (NISQ) devices. Here we introduce QRunes, a cross-platform quantum language for hybrid pr...
Demonstration of a parametrically activated entangling gate protected from flux noise
Sabrina Hong, A. Papageorge, P. Sivarajah +7 more·Jan 23, 2019
In state-of-the-art quantum computing platforms, including superconducting qubits and trapped ions, imperfections in the 2-qubit entangling gates are the dominant contributions of error to system-wide performance. Recently, a novel 2-qubit parametric...
Parallelized quantum error correction with fracton topological codes
Benjamin J. Brown, D. Williamson·Jan 23, 2019
Fracton topological phases have a large number of materialized symmetries that enforce a rigid structure on their excitations. Remarkably, we find that the symmetries of a quantum error-correcting code based on a fracton phase enable us to design dec...
May a Dissipative Environment Be Beneficial for Quantum Annealing?
G. Passarelli, G. Filippis, V. Cataudella +1 more·Jan 23, 2019
We discuss the quantum annealing of the fully-connected ferromagnetic p-spin model in a dissipative environment at low temperature. This model, in the large p limit, encodes in its ground state the solution to the Grover’s problem of searching in uns...
Determining eigenstates and thermal states on a quantum computer using quantum imaginary time evolution
M. Motta, Chong Sun, A. T. Tan +5 more·Jan 23, 2019
The accurate computation of Hamiltonian ground, excited and thermal states on quantum computers stands to impact many problems in the physical and computer sciences, from quantum simulation to machine learning. Given the challenges posed in construct...
Quantum Computing with Rotation-Symmetric Bosonic Codes
A. Grimsmo, J. Combes, B. Baragiola·Jan 23, 2019
Bosonic rotation codes, introduced here, are a broad class of bosonic error-correcting codes based on phase-space rotation symmetry. We present a universal quantum computing scheme applicable to a subset of this class--number-phase codes--which inclu...
A quantum algorithm to efficiently sample from interfering binary trees
Davide Provasoli, B. Nachman, C. Bauer +1 more·Jan 23, 2019
Quantum computers provide an opportunity to efficiently sample from probability distributions that include non-trivial interference effects between amplitudes. Using a simple process wherein all possible state histories can be specified by a binary t...
Robust implementation of generative modeling with parametrized quantum circuits
Vicente Leyton-Ortega, A. Perdomo-Ortiz, O. Perdomo·Jan 23, 2019
Although the performance of hybrid quantum-classical algorithms is highly dependent on the selection of the classical optimizer and the circuit ansätze (Benedetti et al, npj Quantum Inf 5:45, 2019; Hamilton et al, 2018; Zhu et al, 2018), a robust and...
Efficiently estimating average fidelity of a quantum logic gate using few classical random bits.
A. Nema, P. Sen·Jan 22, 2019
We give three new algorithms for efficient in-place estimation, without using ancilla qubits, of average fidelity of a quantum logic gate acting on a d-dimensional system using much fewer random bits than what was known so far. Previous approaches fo...
Pegasus: The second connectivity graph for large-scale quantum annealing hardware
N. Dattani, Szilárd Szalay, N. Chancellor·Jan 22, 2019
Pegasus is a graph which offers substantially increased connectivity between the qubits of quantum annealing hardware compared to the graph Chimera. It is the first fundamental change in the connectivity graph of quantum annealers built by D-Wave sin...