Papers
Live trends in quantum computing research, updated daily from arXiv.
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13,141 papers in 12 months (+1% vs prior quarter)
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Cryogenic amplification of image-charge detection for readout of quantum states of electrons on liquid helium
A. Elarabi, E. Kawakami, Denis Konstantinov·Nov 19, 2020
Accurate detection of quantum states is a vital step in the development of quantum computing. Image-charge detection of quantum states of electrons on liquid helium can potentially be used for the readout of a single-electron qubit; however, low sens...
Hole Spin Qubits in Si FinFETs With Fully Tunable Spin-Orbit Coupling and Sweet Spots for Charge Noise
S. Bosco, B. Het'enyi, D. Loss·Nov 18, 2020
The strong spin-orbit coupling in hole spin qubits enables fast and electrically tunable gates, but at the same time enhances the susceptibility of the qubit to charge noise. Suppressing this noise is a significant challenge in semiconductor quantum ...
Dispersive measurement of a semiconductor double quantum dot via 3D integration of a high-impedance TiN resonator
Nathan Holman, D. Rosenberg, D. Yost +5 more·Nov 17, 2020
Spins in semiconductor quantum dots are a candidate for cryogenic quantum processors due to their exceptionally long coherence times. One major challenge to scaling quantum dot spin qubits is the dense wiring requirements, making it difficult to envi...
Non-trivial symmetries in quantum landscapes and their resilience to quantum noise
Enrico Fontana, M. Cerezo, A. Arrasmith +2 more·Nov 17, 2020
Very little is known about the cost landscape for parametrized Quantum Circuits (PQCs). Nevertheless, PQCs are employed in Quantum Neural Networks and Variational Quantum Algorithms, which may allow for near-term quantum advantage. Such applications ...
Fault-Tolerant Qubit from a Constant Number of Components
Kianna Wan, Soonwon Choi, Isaac H. Kim +2 more·Nov 16, 2020
With gate error rates in multiple technologies now below the threshold required for fault-tolerant quantum computation, the major remaining obstacle to useful quantum computation is scaling, a challenge greatly amplified by the huge overhead imposed ...
Virtual Distillation for Quantum Error Mitigation
W. Huggins, Sam McArdle, T. O’Brien +6 more·Nov 13, 2020
Contemporary quantum computers have relatively high levels of noise, making it difficult to use them to perform useful calculations, even with a large number of qubits. Quantum error correction is expected to eventually enable fault-tolerant quantum ...
Quantum algorithms with local particle-number conservation: Noise effects and error correction
Michael Streif, M. Leib, F. Wudarski +2 more·Nov 13, 2020
Quantum circuits with local particle number conservation (LPNC) restrict the quantum computation to a subspace of the Hilbert space of the qubit register. In a noiseless or fault-tolerant quantum computation, such quantities are preserved. In the pre...
Comparative Study of Sampling-Based Simulation Costs of Noisy Quantum Circuits
Shigeo Hakkaku, K. Fujii·Nov 12, 2020
There have been intensive efforts to develop quantum computers, and the number of qubits is now reaching around 50 qubits. In practice, not only the number of qubits but the fidelity of the gates and measurements plays an important role. The noise in...
Exponential Error Suppression for Near-Term Quantum Devices
B'alint Koczor·Nov 11, 2020
As quantum computers mature, quantum error correcting codes (QECs) will be adopted in order to suppress errors to any desired level $\mathcal{E}$ at a cost in qubit-count $n$ that is merely poly-logarithmic in $\mathcal{E}^{-1}$. However in the NISQ ...
Testing of flag-based fault-tolerance on IBM quantum devices.
Anirudh Lanka, Yuan-Jiun Wang, Prithviraj Prabhu·Nov 6, 2020
It is hard to achieve a theoretical quantum advantage on NISQ devices. Besides the attempts to reduce error using error mitigation and dynamical decoupling, small quantum error correction and fault-tolerant schemes that reduce the high overhead of tr...
Pathways for Entanglement-Based Quantum Communication in the Face of High Noise.
Xiao-Min Hu, Chao Zhang, Yu Guo +10 more·Nov 5, 2020
Entanglement-based quantum communication offers an increased level of security in practical secret shared key distribution. One of the fundamental principles enabling this security-the fact that interfering with one photon will destroy entanglement a...
Surpassing the classical limit in magic square game with distant quantum dots coupled to optical cavities
Sinan Bugu, Fatih Ozaydin, T. Kodera·Nov 3, 2020
The emergence of quantum technologies is heating up the debate on quantum supremacy, usually focusing on the feasibility of looking good on paper algorithms in realistic settings, due to the vulnerability of quantum systems to myriad sources of noise...
Evaluating the noise resilience of variational quantum algorithms
Enrico Fontana, Nathan Fitzpatrick, D. M. Ramo +2 more·Nov 2, 2020
We simulate the effects of different types of noise in state preparation circuits of variational quantum algorithms. We first use a variational quantum eigensolver to find the ground state of a Hamiltonian in presence of noise, and adopt two quality ...
Optimizing Embedding-Related Quantum Annealing Parameters for Reducing Hardware Bias
Aaron Barbosa, Elijah Pelofske, Georg Hahn +1 more·Nov 2, 2020
Quantum annealers have been designed to propose near-optimal solutions to NP-hard optimization problems. However, the accuracy of current annealers such as the ones of D-Wave Systems, Inc., is limited by environmental noise and hardware biases. One w...
One-shot quantum error correction of classical and quantum information
Y. Nakata, Eyuri Wakakuwa, H. Yamasaki·Nov 2, 2020
The major goal of quantum communication theory is to determine how much information can be protected from a given quantum noise by encoding operations. The capacity theorems provide answers to the question in various settings. We here provide a capac...
Mitigating Coherent Noise by Balancing Weight-2 Z-Stabilizers
Jingzhen Hu, Q. Liang, Narayanan Rengaswamy +1 more·Oct 31, 2020
Physical platforms such as trapped ions suffer from coherent noise that does not follow a simple stochastic model. Stochastic errors in quantum systems occur randomly but coherent errors are more damaging since they can accumulate in a particular dir...
Fast spin-valley-based quantum gates in Si with micromagnets
Peihao Huang, Xuedong Hu·Oct 28, 2020
An electron spin qubit in silicon quantum dots holds promise for quantum information processing due to the scalability and long coherence. An essential ingredient to recent progress is the employment of micromagnets. They generate a synthetic spin–or...
Generation and storage of spin squeezing via learning-assisted optimal control
Q. Tan, Mao Zhang, Yu Chen +2 more·Oct 26, 2020
The generation and storage of spin squeezing is an attractive topic in quantum metrology and the foundation of quantum mechanics. The major models to realize the spin squeezing are the one- and two-axis twisting models. Here, we consider a collective...
Quantum semi-supervised generative adversarial network for enhanced data classification
Kouhei Nakaji, N. Yamamoto·Oct 26, 2020
In this paper, we propose the quantum semi-supervised generative adversarial network (qSGAN). The system is composed of a quantum generator and a classical discriminator/classifier (D/C). The goal is to train both the generator and the D/C, so that t...
Protocols for Creating and Distilling Multipartite GHZ States With Bell Pairs
Sébastian de Bone, Runsheng Ouyang, K. Goodenough +1 more·Oct 23, 2020
The distribution of high-quality Greenberger–Horne–Zeilinger (GHZ) states is at the heart of many quantum communication tasks, ranging from extending the baseline of telescopes to secret sharing. They also play an important role in error-correction a...