Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Designs for a two-dimensional Si quantum dot array with spin qubit addressability
M. Tadokoro, T. Nakajima, Takashi Kobayashi +6 more·Jun 21, 2021
Electron spins in Si are an attractive platform for quantum computation, backed with their scalability and fast, high-fidelity quantum logic gates. Despite the importance of two-dimensional integration with efficient connectivity between qubits for m...
Binary Optimal Control Of Single-Flux-Quantum Pulse Sequences
Ryan H. Vogt, A. Petersson·Jun 18, 2021
We introduce a binary, relaxed gradient, trust-region method for optimizing pulse sequences for single flux quanta (SFQ) control of a quantum computer. The pulse sequences are optimized with the goal of realizing unitary gate transformations. Each pul...
Moving quantum states without swap via intermediate higher-dimensional qudits
A. Saha, Debasri Saha, Amlan Chakrabarti·Jun 16, 2021
Quantum algorithms can be realized in the form of a quantum circuit. To map quantum circuit for specific quantum algorithm to quantum hardware, qubit mapping is an imperative technique based on the qubit topology. Due to the neighbourhood constraint o...
Improved upper bounds on the stabilizer rank of magic states
Hammam Qassim, Hakop Pashayan, David Gosset·Jun 14, 2021
<jats:p>In this work we improve the runtime of recent classical algorithms for strong simulation of quantum circuits composed of Clifford and T gates. The improvement is obtained by establishing a new upper bound on the stabilizer rank of <mml:math x...
Universal hardware-efficient topological measurement-based quantum computation via color-code-based cluster states
Seok-Hyung Lee, Hyunseok Jeong·Jun 14, 2021
Topological measurement-based quantum computation (MBQC) enables one to carry out universal fault-tolerant quantum computation via single-qubit Pauli measurements with a family of large entangled states called cluster states as resources. Raussendorf...
Composability of global phase invariant distance and its application to approximation error management
Priyanka Mukhopadhyay·Jun 13, 2021
Many quantum algorithms can be written as a composition of unitaries, some of which can be exactly synthesized by a universal fault-tolerant gate set like Clifford+T, while others can be approximately synthesized. One task of a quantum compiler is to...
Quantum cluster algorithm for data classification
Junxu Li, S. Kais·Jun 13, 2021
We present a quantum algorithm for data classification based on the nearest-neighbor learning algorithm. The classification algorithm is divided into two steps: Firstly, data in the same class is divided into smaller groups with sublabels assisting b...
Quantum Architecture Search with Meta‐Learning
Zhimin He, Chuangtao Chen, Lvzhou Li +2 more·Jun 11, 2021
Variational quantum algorithms (VQAs) have been successfully applied to quantum approximate optimization algorithms, variational quantum compiling and quantum machine learning models. The performances of VQAs largely depend on the architecture of par...
Simplifying continuous-time quantum walks on dynamic graphs
R. Herrman, T. G. Wong·Jun 10, 2021
A continuous-time quantum walk on a dynamic graph evolves by Schrödinger’s equation with a sequence of Hamiltonians encoding the edges of the graph. This process is universal for quantum computing, but in general, the dynamic graph that implements a ...
Linear growth of quantum circuit complexity
J. Haferkamp, P. Faist, N. B. T. Kothakonda +2 more·Jun 9, 2021
The complexity of quantum states has become a key quantity of interest across various subfields of physics, from quantum computing to the theory of black holes. The evolution of generic quantum systems can be modelled by considering a collection of q...
Quantum Carry Lookahead Adders for NISQ and Quantum Image Processing
H. Thapliyal, Edgard Muñoz-Coreas, Vladislav Khalus·Jun 9, 2021
Progress in quantum hardware design is progressing toward machines of sufficient size to begin realizing quantum algorithms in disciplines such as encryption and physics. Quantum circuits for addition are crucial to realize many quantum algorithms on...
Error Mitigation for Deep Quantum Optimization Circuits by Leveraging Problem Symmetries
Ruslan Shaydulin, A. Galda·Jun 8, 2021
High error rates and limited fidelity of quantum gates in near-term quantum devices are the central obstacles to successful execution of the Quantum Approximate Optimization Algorithm (QAOA). In this paper we introduce an application-specific approac...
Realization of a Universal Quantum Gate Set for Itinerant Microwave Photons
K. Reuer, Jean-Claude Besse, Lucien Wernli +5 more·Jun 7, 2021
Deterministic photon-photon gates enable the controlled generation of entanglement between mobile carriers of quantum information. Such gates have thus far been exclusively realized in the optical domain and by relying on post-selection. Here, we pre...
Variational Hamiltonian simulation for translational invariant systems via classical pre-processing
Refik Mansuroglu, T. Eckstein, Ludwig Nützel +2 more·Jun 7, 2021
The simulation of time evolution of large quantum systems is a classically challenging and in general intractable task, making it a promising application for quantum computation. A Trotter–Suzuki approximation yields an implementation thereof, where ...
Simulating a measurement-induced phase transition for trapped-ion circuits
Stefanie Czischek, G. Torlai, Sayonee Ray +2 more·Jun 7, 2021
The rise of programmable quantum devices has motivated the exploration of circuit models which could realize novel physics. A promising candidate is a class of hybrid circuits, where entangling unitary dynamics compete with disentangling measurements...
Quantum Optimization via Four-Body Rydberg Gates.
Clemens Dlaska, K. Ender, G. Mbeng +3 more·Jun 4, 2021
A large ongoing research effort focuses on obtaining a quantum advantage in the solution of combinatorial optimization problems on near-term quantum devices. A particularly promising platform implementing quantum optimization algorithms are arrays of...
Single-component gradient rules for variational quantum algorithms
T. Hubregtsen, Frederik Wilde, Shozab Qasim +1 more·Jun 2, 2021
Many near-term quantum computing algorithms are conceived as variational quantum algorithms, in which parameterized quantum circuits are optimized in a hybrid quantum–classical setup. Examples are variational quantum eigensolvers, quantum approximate...
Experimental error mitigation using linear rescaling for variational quantum eigensolving with up to 20 qubits
Eliot Rosenberg, P. Ginsparg, P. McMahon·Jun 2, 2021
Quantum computers have the potential to help solve a range of physics and chemistry problems, but noise in quantum hardware currently limits our ability to obtain accurate results from the execution of quantum-simulation algorithms. Various methods h...
Worldline Path Integrals for Gauge Fields and Quantum Computing
Yuan Feng, M. McGuigan·Jun 2, 2021
We study different aspects the worldline path integrals with gauge fields using quantum computing. We use the Variational Quantum Eigensolver (VQE) and Evolution of Hamiltonian (EOH) quantum algorithms and IBM QISKit to perform our computations. We a...
Designing Calibration and Expressivity-Efficient Instruction Sets for Quantum Computing
Prakash Murali, L. Lao, M. Martonosi +1 more·Jun 1, 2021
Near-term quantum computing (QC) systems have limited qubit counts, high gate (instruction) error rates, and typically support a minimal instruction set having one type of two-qubit gate (2Q). To reduce program instruction counts and improve applicat...