Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Hierarchical decoding to reduce hardware requirements for quantum computing
Nicolas Delfosse·Jan 30, 2020
Extensive quantum error correction is necessary in order to scale quantum hardware to the regime of practical applications. As a result, a significant amount of decoding hardware is necessary to process the colossal amount of data required to constan...
Finding broken gates in quantum circuits: exploiting hybrid machine learning
Margarite L. LaBorde, Allee C. Rogers, J. Dowling·Jan 29, 2020
Current implementations of quantum logic gates can be highly faulty and introduce errors. In order to correct these errors, it is necessary to first identify the faulty gates. We demonstrate a procedure to diagnose where gate faults occur in a circui...
Enhancing a Near-Term Quantum Accelerator's Instruction Set Architecture for Materials Science Applications
X. Zou, A. Matsuura, S. Premaratne +7 more·Jan 28, 2020
Quantum computers with tens to hundreds of noisy qubits are being developed today. To be useful for real-world applications, we believe that these near-term systems cannot simply be scaled-down non-error-corrected versions of future fault-tolerant la...
Improved quantum circuits for elliptic curve discrete logarithms
Thomas Häner, Samuel Jaques, M. Naehrig +2 more·Jan 27, 2020
We present improved quantum circuits for elliptic curve scalar multiplication, the most costly component in Shor's algorithm to compute discrete logarithms in elliptic curve groups. We optimize low-level components such as reversible integer and modu...
Temporal Information Processing on Noisy Quantum Computers
Jiayin Chen, H. Nurdin, N. Yamamoto·Jan 26, 2020
The combination of machine learning and quantum computing has emerged as a promising approach for addressing previously untenable problems. Reservoir computing is an efficient learning paradigm that utilizes nonlinear dynamical systems for temporal i...
A Quantum Instruction Set Implemented on a Superconducting Quantum Processor
M. Kjaergaard, M. Schwartz, A. Greene +20 more·Jan 23, 2020
A quantum algorithm consists of a sequence of operations and measurements applied to a quantum processor. To date, the instruction set which defines this sequence has been provided by a classical computer and passed via control hardware to the quantu...
Demonstrating a Continuous Set of Two-Qubit Gates for Near-Term Quantum Algorithms.
B. Foxen, C. Neill, A. Dunsworth +54 more·Jan 23, 2020
Quantum algorithms offer a dramatic speedup for computational problems in material science and chemistry. However, any near-term realizations of these algorithms will need to be optimized to fit within the finite resources offered by existing noisy h...
Testing a quantum error-correcting code on various platforms.
Qihao Guo, Yuan-Yuan Zhao, M. Grassl +5 more·Jan 22, 2020
Quantum error correction plays an important role in fault-tolerant quantum information processing. It is usually difficult to experimentally realize quantum error correction, as it requires multiple qubits and quantum gates with high fidelity. Here w...
Natural and bionic neuronal membranes: possible sites for quantum biology
L. Smolin·Jan 21, 2020
A new concept for bionic quantum technology is presented based on a hybrid of a silicon wafer on which is layered a phospholipid membrane, such as is found in biological cell membranes. The phosphorus atoms in the head groups of the membranes carry n...
Context-Sensitive and Duration-Aware Qubit Mapping for Various NISQ Devices
Yu Zhang, Haowei Deng, Quanxi Li·Jan 19, 2020
Quantum computing (QC) technologies have reached a second renaissance in the last decade. Some fully programmable QC devices have been built based on superconducting or ion trap technologies. Although different quantum technologies have their own par...
Subdivided Phase Oracle for NISQ Search Algorithms
Takahiko Satoh, Yasuhiro Ohkura, Rodney Van Meter·Jan 18, 2020
Because noisy intermediate-scale quantum (NISQ) machines accumulate errors quickly, we need new approaches to designing NISQ-aware algorithms and assessing their performance. Algorithms with characteristics that appear less desirable under ideal circ...
Optimal two-qubit circuits for universal fault-tolerant quantum computation
A. Glaudell, N. J. Ross, Jacob M. Taylor·Jan 16, 2020
We study two-qubit circuits over the Clifford+CS gate set, which consists of the Clifford gates together with the controlled-phase gate CS = diag(1, 1, 1, i). The Clifford+CS gate set is universal for quantum computation and its elements can be imple...
Signal processing techniques for efficient compilation of controlled rotations in trapped ions
K. Groenland, Freek Witteveen, K. Schoutens +1 more·Jan 15, 2020
Quantum logic gates with many control qubits are essential in many quantum algorithms, but remain challenging to perform in current experiments. Trapped ion quantum computers natively feature the Mølmer–Sørensen (MS) entangling operation, which effec...
Quantum Machine Learning Algorithm for Knowledge Graphs
Yunpu Ma, Yuyi Wang, Volker Tresp·Jan 4, 2020
Semantic knowledge graphs are large-scale triple-oriented databases for knowledge representation and reasoning. Implicit knowledge can be inferred by modeling the tensor representations generated from knowledge graphs. However, as the sizes of knowle...
Discrete Adjoints for Accurate Numerical Optimization with Application to Quantum Control
N. Petersson, Fortino Garcia, A. Copeland +2 more·Jan 4, 2020
We consider optimizing control functions for realizing logical gates in a closed quantum systems, where the evolution of the state vector is governed by the time dependent Schrodinger equation. This is an optimal control problem where the objective f...
Efficient classical simulation of random shallow 2D quantum circuits
John Napp, R. L. Placa, A. Dalzell +2 more·Dec 31, 2019
Random quantum circuits are commonly viewed as hard to simulate classically. In some regimes this has been formally conjectured, and there had been no evidence against the more general possibility that for circuits with uniformly random gates, approx...
Quantum logic gate synthesis as a Markov decision process
M. S. Alam, Noah F. Berthusen, P. Orth·Dec 27, 2019
Reinforcement learning has witnessed recent applications to a variety of tasks in quantum programming. The underlying assumption is that those tasks could be modeled as Markov decision processes (MDPs). Here, we investigate the feasibility of this as...
Quantum Error Correction in Loop Quantum Gravity
D. Vaid·Dec 25, 2019
Previous works (by Almiehri, Dong, Harlow, Pastakawski, Preskill, Yoshida and others) have established that quantum error correction plays an important role in understanding how the bulk degrees of freedom of an Anti-deSitter spacetime are encoded in...
Automated discovery of logical gates for quantum error correction
Hongxiang Chen, M. Vasmer, N. P. Breuckmann +1 more·Dec 20, 2019
Quantum error correcting codes protect quantum computation from errors caused by decoherence and other noise. Here we study the problem of designing logical operations for quantum error correcting codes. We present an automated procedure that generat...
Quantum Fourier Transform in Oscillating Modes
Qiming Chen, F. Deppe, R. Wu +9 more·Dec 20, 2019
Quantum Fourier transform (QFT) is a key ingredient of many quantum algorithms. In typical applications such as phase estimation, a considerable number of ancilla qubits and gates are used to form a Hilbert space large enough for high-precision resul...