Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Geometrical Formalism for Dynamically Corrected Gates in Multiqubit Systems
Donovan Buterakos, Sankar Das Sarma, Edwin Barnes·Jul 30, 2020
The ability to perform gates in multiqubit systems that are robust to noise is of crucial importance for the advancement of quantum information technologies. However, finding control pulses that cancel noise while performing a gate is made difficult ...
Qudits and High-Dimensional Quantum Computing
Yuchen Wang, Zixuan Hu, B. Sanders +1 more·Jul 30, 2020
Qudit is a multi-level computational unit alternative to the conventional 2-level qubit. Compared to qubit, qudit provides a larger state space to store and process information, and thus can provide reduction of the circuit complexity, simplification...
Noise Reduction in Qubit Readout with a Two-Mode Squeezed Interferometer
G. Liu, X. Cao, T. Chien +3 more·Jul 30, 2020
Fault-tolerant quantum information processing with flawed qubits and gates requires highly efficient, quantum non-demolition (QND) qubit readout. In superconducting circuits, qubit readout using coherent light with fidelity above 99% has been achieve...
Scalable Evaluation of Quantum-Circuit Error Loss Using Clifford Sampling.
Zhen Wang, Yanzhu Chen, Zixuan Song +6 more·Jul 20, 2020
A major challenge in developing quantum computing technologies is to accomplish high precision tasks by utilizing multiplex optimization approaches, on both the physical system and algorithm levels. Loss functions assessing the overall performance of...
Supervised Learning Using a Dressed Quantum Network with "Super Compressed Encoding": Algorithm and Quantum-Hardware-Based Implementation
Saurabh Kumar, Siddharth Dangwal, D. Bhowmik·Jul 20, 2020
Implementation of variational Quantum Machine Learning (QML) algorithms on Noisy Intermediate-Scale Quantum (NISQ) devices is known to have issues related to the high number of qubits needed and the noise associated with multi-qubit gates. In this pa...
Fault-tolerant measurement-free quantum error correction with multiqubit gates
M. Perlin, Vickram N. Premakumar, Jiakai Wang +2 more·Jul 19, 2020
Measurement-free quantum error correction (MFQEC) offers an alternative to standard measurement-based QEC in platforms with an unconditional qubit reset gate. We revisit the question of fault tolerance (FT) for a measurement-free variant of the Stean...
Optimal universal quantum error correction via bounded reference frames
Yuxiang Yang, Y. Mo, J. Renes +2 more·Jul 17, 2020
Error correcting codes with a universal set of transversal gates are a desideratum for quantum computing. Such codes, however, are ruled out by the Eastin-Knill theorem. Moreover, the theorem also rules out codes which are covariant with respect to t...
High-fidelity two-qubit gates in silicon above one Kelvin.
L. Petit, M. Russ, H. Eenink +4 more·Jul 17, 2020
Spin qubits in quantum dots define an attractive platform for scalable quantum information because of their compatibility with semiconductor manufacturing, their long coherence times, and the ability to operate at temperatures exceeding one Kelvin. Q...
Experimental implementation of non-Clifford interleaved randomized benchmarking with a controlled- S gate
Shelly Garion, Naoki Kanazawa, H. Landa +4 more·Jul 16, 2020
Hardware efficient transpilation of quantum circuits to a quantum devices native gateset is essential for the execution of quantum algorithms on noisy quantum computers. Typical quantum devices utilize a gateset with a single two-qubit Clifford entan...
Emulating Quantum Circuits With Generalized Ising Machines
S. Chowdhury, Kerem Y Çamsarı, S. Datta·Jul 14, 2020
The primary objective of this paper is to present an exact and general procedure for mapping any sequence of quantum gates onto a network of probabilistic p-bits which can take on one of two values 0 and 1. The first <inline-formula> <tex-math notati...
Benchmarking 16-element quantum search algorithms on IBM quantum processors
Jan Gwinner, Marcin Bria'nski, W. Burkot +2 more·Jul 13, 2020
We present experimental results on running 4-qubit unstructured search on IBM quantum processors. Our best attempt attained probability of success around 24.5%. We try several algorithms and use the most recent developments in quantum search to reduc...
MoG-VQE: Multiobjective genetic variational quantum eigensolver
D. Chivilikhin, A. Samarin, V. Ulyantsev +3 more·Jul 8, 2020
Variational quantum eigensolver (VQE) emerged as a first practical algorithm for near-term quantum computers. Its success largely relies on the chosen variational ansatz, corresponding to a quantum circuit that prepares an approximate ground state of...
On Actual Preparation of Dicke State on a Quantum Computer
Chandra Sekhar Mukherjee, S. Maitra, V. Gaurav +1 more·Jul 3, 2020
The exact number of CNOT and single qubit gates needed to implement a Quantum Algorithm in a given architecture is one of the central problems of Quantum Computation. In this work we study the importance of concise realizations of Partially defined U...
A switching approach for perfect state transfer over a scalable and routing enabled network architecture with superconducting qubits
Siddhant Singh·Jul 3, 2020
We propose a hypercube switching architecture for the perfect state transfer (PST) where we prove that it is always possible to find an induced hypercube in any given hypercube of any dimension such that PST can be performed between any two given ver...
Approximate quantum circuit synthesis using block encodings
Daan Camps, Roel Van Beeumen·Jul 2, 2020
Author(s): Camps, Daan; Beeumen, Roel Van | Abstract: One of the challenges in quantum computing is the synthesis of unitary operators into quantum circuits with polylogarithmic gate complexity. Exact synthesis of generic unitaries requires an expone...
Implementing a Fast Unbounded Quantum Fanout Gate Using Power-Law Interactions
Andrew Y. Guo, A. Deshpande, Su-Kuan Chu +6 more·Jul 1, 2020
The standard circuit model for quantum computation presumes the ability to directly perform gates between arbitrary pairs of qubits, which is unlikely to be practical for large-scale experiments. Power-law interactions with strength decaying as $1/r^...
Faster Digital Quantum Simulation by Symmetry Protection
Minh C. Tran, Yuan Su, D. Carney +1 more·Jun 29, 2020
Simulating the dynamics of quantum systems is an important application of quantum computers and has seen a variety of implementations on current hardware. We show that by introducing quantum gates implementing unitary transformations generated by the...
Reinforcement Learning for Digital Quantum Simulation.
Adrien Bolens, M. Heyl·Jun 29, 2020
Digital quantum simulation on quantum computers provides the potential to simulate the unitary evolution of any many-body Hamiltonian with bounded spectrum by discretizing the time evolution operator through a sequence of elementary quantum gates. A ...
On the Structure of the CNOT-Dihedral Group
Shelly Garion, Andrew W. Cross·Jun 22, 2020
In this note we present explicit canonical forms for all the elements in the $2$-qubit CNOT-Dihedral group, with minimal numbers of controlled-$S$ ($CS$) and controlled-$X$ ($CX$) gates, using the generating set of quantum gates $[X, T, CX, CS]$. We ...
A polynomial time and space heuristic algorithm for T-count
M. Mosca, Priyanka Mukhopadhyay·Jun 22, 2020
An important part of reaping computational advantage from a quantum computer is to reduce the quantum resources needed to implement a desired quantum algorithm. Quantum algorithms that are too large to be practical on noisy intermediate scale quantum...