Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Robust Quantum Control for the Manipulation of Solid-State Spins
Yi-fan Zhang, Hao Wu, Xiao-dong Yang +6 more·May 5, 2022
Robust and high-fidelity control of electron spins in solids is the cornerstone for facilitating applications of solid-state spins in quantum information processing and quantum sensing. However, precise control of spin systems is always challenging d...
A Tool For Debugging Quantum Circuits
Sara Ayman Metwalli, R. V. Meter·May 4, 2022
As the scale of quantum programs grows to match that of classical software, the nascent field of quantum software engineering must mature and tools such as debuggers will become increasingly important. However, developing a quantum debugger is challe...
Tunable Quantum Neural Networks in the QPAC-Learning Framework
Viet Pham Ngoc, David Tuckey, H. Wiklicky·May 3, 2022
In this paper, we investigate the performances of tunable quantum neural networks in the Quantum Probably Approximately Correct (QPAC) learning framework. Tunable neural networks are quantum circuits made of multi-controlled X gates. By tuning the se...
Efficient Use of Quantum Linear System Algorithms in Interior Point Methods for Linear Optimization
Mohammadhossein Mohammadisiahroudi, Ohammadisiahroudi, Amin +3 more·May 2, 2022
Quantum computing has attracted significant interest in the optimization community because it potentially can solve classes of optimization problems faster than conventional supercomputers. Several researchers proposed quantum computing methods, espe...
Dynamic Qubit Routing with CNOT Circuit Synthesis for Quantum Compilation
A. M. D. Griend, Sarah Meng Li·May 2, 2022
Many quantum computers have constraints regarding which two-qubit operations are locally allowed. To run a quantum circuit under those constraints, qubits need to be mapped to different quantum registers, and multi-qubit gates need to be routed accor...
A walk through of time series analysis on quantum computers
A. Daskin·May 2, 2022
—Because of the rotational components on quantum circuits, some quantum neural networks based on variational circuits can be considered equivalent to the classical Fourier networks. In addition, they can be used to predict the Fourier coefficients of ...
Efficient variational synthesis of quantum circuits with coherent multi-start optimization
N. Nemkov, E. Kiktenko, I. Luchnikov +1 more·May 2, 2022
We consider the problem of the variational quantum circuit synthesis into a gate set consisting of the CNOT gate and arbitrary single-qubit (1q) gates with the primary target being the minimization of the CNOT count. First we note that along with the...
Quantum Approximate Optimization Algorithm with Sparsified Phase Operator
Xiaoyuan Liu, Ruslan Shaydulin, Ilya Safro·Apr 30, 2022
The Quantum Approximate Optimization Algorithm (QAOA) is a promising candidate algorithm for demonstrating quantum advantage in optimization using near-term quantum computers. However, QAOA has high requirements on gate fidelity due to the need to en...
Hybrid quantum-classical reservoir computing of thermal convection flow
Philip R. Pfeffer, F. Heyder, J. Schumacher·Apr 29, 2022
We simulate the nonlinear chaotic dynamics of Lorenz-type models for a classical two-dimensional thermal convection flow with 3 and 8 degrees of freedom by a hybrid quantum--classical reservoir computing model. The high-dimensional quantum reservoir ...
FABLE: Fast Approximate Quantum Circuits for Block-Encodings
Daan Camps, R. Beeumen·Apr 29, 2022
Block-encodings of matrices have become an essential element of quantum algorithms derived from the quantum singular value transformation. This includes a variety of algorithms ranging from the quantum linear systems problem to quantum walk, Hamilton...
Symbolic Synthesis of Clifford Circuits and Beyond
M. Amy, Owen Bennett-Gibbs, N. J. Ross·Apr 29, 2022
Path sums are a convenient symbolic formalism for quantum operations with applications to the simulation, optimization, and verification of quantum protocols. Unlike quantum circuits, path sums are not limited to unitary operations, but can express a...
Foundations for learning from noisy quantum experiments
Hsin-Yuan Huang, S. Flammia, J. Preskill·Apr 28, 2022
Understanding what can be learned from experiments is central to scientific progress. In this work, we use a learning-theoretic perspective to study the task of learning physical operations in a quantum machine when all operations (state preparation,...
Reducing Number of Gates in Quantum Random Walk Search Algorithm via Modification of Coin Operators
Hristo Tonchev, Petar Danev·Apr 27, 2022
This paper examines a way to simplify the circuit of quantum random walk search algorithm, when the traversing coin is constructed by both generalized Householder reflection and an additional phase multiplier. If an appropriate relation between corre...
Towards Quantum Ray Tracing
Luís Paulo Santos, Thomas Bashford-rogers, J. Barbosa +1 more·Apr 27, 2022
Rendering on conventional computers is capable of generating realistic imagery, but the computational complexity of these light transport algorithms is a limiting factor of image synthesis. Quantum computers have the potential to significantly improv...
Reinforcement-learning generation of four-qubit entangled states
Sara Giordano, M. Martin-Delgado·Apr 26, 2022
We have devised an artificial intelligence algorithm with machine reinforcement learning (Q-learning) to construct remarkable entangled states with 4 qubits. This way, the algorithm is able to generate representative states for some of the 49 true SL...
Quantum error mitigation by hidden inverses protocol in superconducting quantum devices
Vicente Leyton-Ortega, Swarnadeep Majumder, R. Pooser·Apr 26, 2022
We present a method to improve the convergence of variational algorithms based on hidden inverses (HIs) to mitigate coherent errors. In the context of error mitigation, this means replacing the hardware implementation of certain Hermitian gates with ...
Qunity: A Unified Language for Quantum and Classical Computing
Finn Voichick, Robert Rand, M. Hicks·Apr 26, 2022
We introduce Qunity, a new quantum programming language designed to treat quantum computing as a natural generalization of classical computing. Qunity presents a unified syntax where familiar programming constructs can have both quantum and classical...
Complexity of Quantum Circuits via Sensitivity, Magic, and Coherence
Kaifeng Bu, Roy J. Garcia, A. Jaffe +2 more·Apr 26, 2022
Quantum circuit complexity—a measure of the minimum number of gates needed to implement a given unitary transformation—is a fundamental concept in quantum computation, with widespread applications ranging from determining the running time of quantum ...
Hybrid controlled-sum gate with one superconducting qutrit and one cat-state qutrit and application in hybrid entangled state preparation
Qi-Ping Su, Yu Zhang, Liang Bin +1 more·Apr 25, 2022
Compared with a qubit, a qudit (i.e., d -level or d -state quantum system) provides a larger Hilbert space to store and process information. On the other hand, qudit-based hybrid quantum computing usually requires performing hybrid quantum gates with...
Partitioning qubits in hypergraph product codes to implement logical gates
A. O. Quintavalle, P. Webster, M. Vasmer·Apr 22, 2022
The promise of high-rate low-density parity check (LDPC) codes to substantially reduce the overhead of fault-tolerant quantum computation depends on constructing efficient, fault-tolerant implementations of logical gates on such codes. Transversal ga...