Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Optimizing Quantum Programs Against Decoherence: Delaying Qubits into Quantum Superposition
Yu Zhang, Haowei Deng, Quanxi Li +2 more·Apr 18, 2019
Quantum computing technology has reached a second renaissance in the last decade. However, in the NISQ era pointed out by John Preskill in 2018, quantum noise and decoherence, which affect the accuracy and execution effect of quantum programs, cannot...
Gentle measurement of quantum states and differential privacy
S. Aaronson, G. Rothblum·Apr 18, 2019
In differential privacy (DP), we want to query a database about n users, in a way that “leaks at most ε about any individual user,” even conditioned on any outcome of the query. Meanwhile, in gentle measurement, we want to measure n quantum states, i...
Adaptive scheduling of noise characterization in quantum computers
R. Gupta, A. Milne, C. Edmunds +2 more·Apr 15, 2019
New quantum computing architectures consider integrating qubits as sensors to provide actionable information useful for decoherence mitigation on neighboring data qubits. Little work has addressed how such schemes may be efficiently implemented in or...
Study of Decoherence in Quantum Computers: A Circuit-Design Perspective
Abdullah Ash-Saki, M. Alam, Swaroop Ghosh·Apr 8, 2019
Decoherence of quantum states is a major hurdle towards scalable and reliable quantum computing. Lower decoherence (i.e., higher fidelity) can alleviate the error correction overhead and obviate the need for energy-intensive noise reduction technique...
A Jacobi Diagonalization and Anderson Acceleration Algorithm For Variational Quantum Algorithm Parameter Optimization.
R. Parrish, Joseph Iosue, A. Ozaeta +1 more·Apr 5, 2019
The optimization of circuit parameters of variational quantum algorithms such as the variational quantum eigensolver (VQE) or the quantum approximate optimization algorithm (QAOA) is a key challenge for the practical deployment of near-term quantum c...
Framework for atomic-level characterisation of quantum computer arrays by machine learning
M. Usman, Yi Z. Wong, C. Hill +1 more·Apr 3, 2019
Atomic-level qubits in silicon are attractive candidates for large-scale quantum computing; however, their quantum properties and controllability are sensitive to details such as the number of donor atoms comprising a qubit and their precise location...
Quantum Advantage with Noisy Shallow Circuits in 3D
S. Bravyi, David Gosset, Robert Koenig +1 more·Apr 2, 2019
Prior work has shown that there exists a relation problem which can be solved with certainty by a constant-depth quantum circuit composed of geometrically local gates in two dimensions, but cannot be solved with high probability by any classical cons...
Encoding an Oscillator into Many Oscillators.
Kyungjoo Noh, S. Girvin, Liang Jiang·Mar 29, 2019
An outstanding challenge for quantum information processing using bosonic systems is Gaussian errors such as excitation loss and added thermal noise errors. Thus, bosonic quantum error correction is essential. Most bosonic quantum error correction sc...
Hybrid classical-quantum linear solver using Noisy Intermediate-Scale Quantum machines
Chih-Chieh Chen, Shiue-yuan Shiau, Ming-Feng Wu +1 more·Mar 26, 2019
We propose a realistic hybrid classical-quantum linear solver to solve systems of linear equations of a specific type, and demonstrate its feasibility with Qiskit on IBM Q systems. This algorithm makes use of quantum random walk that runs in O\docume...
Advantage Distillation for Device-Independent Quantum Key Distribution.
E. Y. Tan, C. Lim, R. Renner·Mar 25, 2019
Device-independent quantum key distribution (DIQKD) offers the prospect of distributing secret keys with only minimal security assumptions, by making use of a Bell violation. However, existing DIQKD security proofs have low noise tolerances, making a...
Robust quantum control against clock noises in multiqubit systems
Haijin Ding, R. Wu·Mar 25, 2019
High-precision manipulation of multi-qubit quantum systems requires strictly clocked and synchronized multi-channel control signals. However, practical Arbitrary Waveform Generators (AWGs) always suffer from random signal jitters and channel latencie...
Enhanced Multiqubit Phase Estimation in Noisy Environments by Local Encoding.
Massimiliano Proietti, M. Ringbauer, Francesco Graffitti +7 more·Mar 21, 2019
The first generation of multiqubit quantum technologies will consist of noisy, intermediate-scale devices for which active error correction remains out of reach. To exploit such devices, it is thus imperative to use passive error protection that meet...
Achieving the Heisenberg limit under general Markovian noise using quantum error correction without ancilla
Yi Peng, H. Fan·Mar 19, 2019
Practical quantum metrology is generally hindered by environment noise which can demolish the advantage of breaching the shot-noise limit provided by quantum mechanics. Recently, quantum error-correction (QEC) codes have been developed for restoring ...
Machine learning methods in quantum computing theory
D. V. Fastovets, Y. Bogdanov, B. Bantysh +1 more·Mar 15, 2019
Classical machine learning theory and theory of quantum computations are among of the most rapidly developing scientific areas in our days. In recent years, researchers investigated if quantum computing can help to improve classical machine learning ...
Channel Decoding with Quantum Approximate Optimization Algorithm
Toshiki Matsumine, T. Koike-Akino, Ye Wang·Mar 6, 2019
Motivated by the recent advancement of quantum processors, we investigate quantum approximate optimization algorithm (QAOA) to employ quasi-maximum-likelihood (ML) decoding of classical channel codes. QAOA is a hybrid quantum-classical variational al...
Information-theoretic aspects of the generalized amplitude-damping channel
Sumeet Khatri, Kunal Sharma, M. Wilde·Mar 5, 2019
The generalized amplitude damping channel (GADC) is one of the sources of noise in superconducting-circuit-based quantum computing. It can be viewed as the qubit analogue of the bosonic thermal channel, and it thus can be used to model lossy processe...
Efficient Quantum Error Correction of Dephasing Induced by a Common Fluctuator.
David Layden, Mo Chen, P. Cappellaro·Mar 4, 2019
Quantum error correction is expected to be essential in large-scale quantum technologies. However, the substantial overhead of qubits it requires is thought to greatly limit its utility in smaller, near-term devices. Here we introduce a new family of...
All-Gaussian Universality and Fault Tolerance with the Gottesman-Kitaev-Preskill Code.
B. Baragiola, Giacomo Pantaleoni, R. N. Alexander +2 more·Mar 1, 2019
The Gottesman-Kitaev-Preskill (GKP) encoding of a qubit within an oscillator is particularly appealing for fault-tolerant quantum computing with bosons because Gaussian operations on encoded Pauli eigenstates enable Clifford quantum computing with er...
Characterizing large-scale quantum computers via cycle benchmarking
A. Erhard, Joel J. Wallman, L. Postler +7 more·Feb 22, 2019
Quantum computers promise to solve certain problems more efficiently than their digital counterparts. A major challenge towards practically useful quantum computing is characterizing and reducing the various errors that accumulate during an algorithm...
Minimal Time Robust Control for Two Superconducting Qubits
Niril George, Joseph L. Allen, Robert Kosut +1 more·Feb 21, 2019
High-fidelity quantum gates are crucial for achieving fault-tolerant quantum computing; however, decoherence significantly reduces gate fidelities during long operation times. Although optimal control techniques can theoretically minimize these opera...