Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Verified compilation of Quantum oracles
Liyi Li, Finn Voichick, Kesha Hietala +3 more·Dec 13, 2021
Quantum algorithms often apply classical operations, such as arithmetic or predicate checks, over a quantum superposition of classical data; these so-called oracles are often the largest components of a quantum program. To ease the construction of ef...
A Structured Method for Compilation of QAOA Circuits in Quantum Computing
Yuwei Jin, L. Fong, Yan-Hao Chen +5 more·Dec 12, 2021
Quantum Approximation Optimization Algorithm (QAOA) is a highly advocated variational algorithm for solving the combinatorial optimization problem. One critical feature in the quantum circuit of QAOA algorithm is that it consists of two-qubit operato...
Coherent effects contribution to a fast gate fidelity in ion quantum computer
P. Sidorov, M. Aksenov, I. Zalivako +5 more·Dec 12, 2021
Trapped ions are one of the most promising platforms for quantum computing due to the longest qubit coherence times and the highest gate fidelities. However, scaling the number of ions (qubits) in a linear Coulomb crystal is the key difficulty on the...
Contour Integral-based Quantum Algorithm for Estimating Matrix Eigenvalue Density
Y. Futamura, Xiucai Ye, T. Sakurai·Dec 10, 2021
The eigenvalue density of a matrix plays an important role in various types of scientific computing such as electronic-structure calculations. In this paper, we propose a quantum algorithm for computing the eigenvalue density in a given interval. Our...
Combined Dissipative and Hamiltonian Confinement of Cat Qubits
R. Gautier, A. Sarlette, M. Mirrahimi·Dec 10, 2021
Quantum error correction with biased-noise qubits can drastically reduce the hardware overhead for universal and fault-tolerant quantum computation. Cat qubits are a promising realization of biased-noise qubits as they feature an exponential error bi...
Compressive Gate Set Tomography
Raphael Brieger, I. Roth, M. Kliesch·Dec 9, 2021
Flexible characterization techniques that identify and quantify experimental imperfections under realistic assumptions are crucial for the development of quantum computers. Gate set tomography is a characterization approach that simultaneously and se...
Experimental Characterization of Fault-Tolerant Circuits in Small-Scale Quantum Processors
Rosie Cane, Daryus Chandra, S. Ng +1 more·Dec 8, 2021
Experiments conducted on open-access cloud-based IBM Quantum devices are presented for characterizing their fault tolerance using [4,2,2]-encoded gate sequences. Up to 100 logical gates are activated in the Ibmq_Bogota and Ibmq_Santiago devices and w...
Quantum readout error mitigation via deep learning
Jihye Kim, Byungdu Oh, Y. Chong +2 more·Dec 7, 2021
Quantum computing devices are inevitably subject to errors. To leverage quantum technologies for computational benefits in practical applications, quantum algorithms and protocols must be implemented reliably under noise and imperfections. Since nois...
Efficient Universal Quantum Compilation: An Inverse-free Solovay-Kitaev Algorithm
Adam Bouland, Tudor Giurgică-Tiron·Dec 3, 2021
The Solovay-Kitaev algorithm is a fundamental result in quantum computation. It gives an algorithm for efficiently compiling arbitrary unitaries using universal gate sets: any unitary can be approximated by short gates sequences, whose length scales ...
Morphing Quantum Codes
M. Vasmer, Aleksander Kubica·Dec 2, 2021
We introduce a morphing procedure that can be used to generate new quantum codes from existing quantum codes. In particular, we morph the 15-qubit Reed-Muller code to obtain a $[\![10,1,2]\!]$ code that is the smallest known stabilizer code with a fa...
Optimizing frequency allocation for fixed-frequency superconducting quantum processors
A. Morvan, Larry Chen, Jeffrey Larson +2 more·Dec 2, 2021
Fixed-frequency superconducting quantum processors are one of the most mature quantum computing architectures with high-coherence qubits and simple controls. However, high-fidelity multiqubit gates pose tight requirements on individual qubit frequenci...
A hybrid classical-quantum algorithm for solution of nonlinear ordinary differential equations
Alok Shukla, P. Vedula·Nov 30, 2021
A hybrid classical-quantum approach for the solution of nonlinear ordinary di ff erential equations using Walsh-Hadamard basis functions is proposed. Central to this hybrid approach is the computation of the Walsh-Hadamard transform of arbitrary vecto...
Limiting the Search Space in Optimal Quantum Circuit Mapping
Lukas Burgholzer, Sarah Schneider, R. Wille·Nov 30, 2021
Executing quantum circuits on currently available quantum computers requires compiling them to a representation that conforms to all restrictions imposed by the targeted architecture. Due to the limited connectivity of the devices' physical qubits, a...
Metropolis-style random sampling of quantum gates for the estimation of low-energy observables
J. Unmuth-Yockey·Nov 29, 2021
We propose a quantum algorithm to compute low-energy expectation values of a quantum Hamiltonian by sampling a partition function associated with the average energy of that Hamiltonian. For any given quantum circuit-Hamiltonian pair, there is an asso...
Random Quantum Circuits Transform Local Noise into Global White Noise
A. Dalzell, Nicholas Hunter-Jones, F. Brandão·Nov 29, 2021
We study the distribution over measurement outcomes of noisy random quantum circuits in the regime of low fidelity, which corresponds to the setting where the computation experiences at least one gate-level error with probability close to one. We mod...
Fluxonium: An Alternative Qubit Platform for High-Fidelity Operations.
F. Bao, Haowei Deng, D. Ding +25 more·Nov 26, 2021
Superconducting qubits provide a promising path toward building large-scale quantum computers. The simple and robust transmon qubit has been the leading platform, achieving multiple milestones. However, fault-tolerant quantum computing calls for qubi...
Quantum state preparation by adiabatic evolution with custom gates
E. A. Coello Pérez, J. Bonitati, Dean Lee +2 more·Nov 24, 2021
Quantum state preparation by adiabatic evolution is currently rendered ineffective by the long implementation times of the underlying quantum circuits, comparable to the decoherence time of present and near-term quantum devices. These implementation ...
Imaginary-time evolution using forward and backward real-time evolution with a single ancilla: First-quantized eigensolver algorithm for quantum chemistry
Taichi Kosugi, Yusuke Nishiya, Hirofumi Nishi +1 more·Nov 24, 2021
Imaginary-time evolution (ITE) on a quantum computer is a promising formalism for obtaining the ground state of a quantum system. As a kind of it, the probabilistic ITE (PITE) takes advantage of measurements to implement the nonunitary operations. We...
Demonstration of fault-tolerant universal quantum gate operations
L. Postler, Sascha Heußen, Ivan Pogorelov +10 more·Nov 24, 2021
Quantum computers can be protected from noise by encoding the logical quantum information redundantly into multiple qubits using error-correcting codes1,2. When manipulating the logical quantum states, it is imperative that errors caused by imperfect...
Two-qubit silicon quantum processor with operation fidelity exceeding 99%
A. Mills, C. Guinn, M. Gullans +4 more·Nov 23, 2021
Silicon spin qubits satisfy the necessary criteria for quantum information processing. However, a demonstration of high-fidelity state preparation and readout combined with high-fidelity single- and two-qubit gates, all of which must be present for q...