Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
A scalable quantum computing platform using symmetric-top molecules
Phelan Yu, L. Cheuk, I. Kozyryev +1 more·May 15, 2019
We propose a new scalable platform for quantum computing (QC)—an array of optically trapped symmetric-top molecules (STMs) of the alkaline earth monomethoxide (MOCH3) family. Individual STMs form qubits, and the system is readily scalable to 100–1000...
Programming multi-level quantum gates in disordered computing reservoirs via machine learning
G. Marcucci, D. Pierangeli, P. Pinkse +2 more·May 13, 2019
Novel machine learning computational tools open new perspectives for quantum information systems. Here we adopt the open-source programming library TensorFlow to design multi-level quantum gates, including a computing reservoir represented by a rando...
Realization of the Werner–Holevo and Landau–Streater Quantum Channels for Qutrits on Quantum Computers
A. I. Pakhomchik, I. Feshchenko, A. Glatz +5 more·May 13, 2019
We realize the Landau–Streater (LS) and Werner–Holevo (WH) quantum channels for qutrits on IBM quantum computers. These channels correspond to the interaction between a qutrit and its environment that results in the globally unitarily covariant qutri...
Generalized swap networks for near-term quantum computing
B. O’Gorman, W. Huggins, E. Rieffel +1 more·May 13, 2019
The practical use of many types of near-term quantum computers requires accounting for their limited connectivity. One way of overcoming limited connectivity is to insert swaps in the circuit so that logical operations can be performed on physically ...
From Ans\"atze to Z-gates: a NASA View of Quantum Computing
E. Rieffel, Stuart Hadfield, T. Hogg +12 more·May 8, 2019
For the last few years, the NASA Quantum Artificial Intelligence Laboratory (QuAIL) has been performing research to assess the potential impact of quantum computers on challenging computational problems relevant to future NASA missions. A key aspect ...
Option Pricing using Quantum Computers
N. Stamatopoulos, D. Egger, Yue Sun +4 more·May 7, 2019
We present a methodology to price options and portfolios of options on a gate-based quantum computer using amplitude estimation, an algorithm which provides a quadratic speedup compared to classical Monte Carlo methods. The options that we cover incl...
A Ten-Qubit Solid-State Spin Register with Quantum Memory up to One Minute
C. Bradley, J. Randall, M. Abobeih +6 more·May 6, 2019
Spins associated to single defects in solids provide promising qubits for quantum information processing and quantum networks. Recent experiments have demonstrated long coherence times, high-fidelity operations and long-range entanglement. However, c...
Efficient Quantum Gates for Individual Nuclear Spin Qubits by Indirect Control.
Swathi S. Hegde, Jingfu Zhang, D. Suter·May 5, 2019
Hybrid quantum registers, such as electron-nuclear spin systems, have emerged as promising hardware for implementing quantum information and computing protocols in scalable systems. Nevertheless, the coherent control of such systems still faces chall...
Resonant microwave-mediated interactions between distant electron spins
F. Borjans, X. Croot, Xiao Mi +3 more·May 2, 2019
Nonlocal qubit interactions are a hallmark of advanced quantum information technologies1–5. The ability to transfer quantum states and generate entanglement over distances much larger than qubit length scales greatly increases connectivity and is an ...
Bias-preserving gates with stabilized cat qubits
S. Puri, L. St-Jean, J. Gross +11 more·May 1, 2019
Noise asymmetry in the quantum operations with cat-qubits is exploited for efficient fault-tolerant quantum error correction. The code capacity threshold for error correction using biased-noise qubits is known to be higher than with qubits without su...
Knuth-Bendix Completion Algorithm and Shuffle Algebras For Compiling NISQ Circuits
Raouf Dridi, H. Alghassi, S. Tayur·Apr 30, 2019
Compiling quantum circuits lends itself to an elegant formulation in the language of rewriting systems on non commutative polynomial algebras $\mathbb Q\langle X\rangle$. The alphabet $X$ is the set of the allowed hardware 2-qubit gates. The set of g...
Resource optimized quantum architectures for surface code implementations of magic-state distillation
Adam Holmes, Yongshan Ding, Ali Javadi-Abhari +3 more·Apr 25, 2019
Abstract Quantum computers capable of solving classically intractable problems are under construction, and intermediate-scale devices are approaching completion. Current efforts to design large-scale devices require allocating immense resources to er...
Leakage mitigation for quantum error correction using a mixed qubit scheme
N. C. Brown, K. Brown·Apr 24, 2019
Leakage errors take qubits out of the computational subspace and will accumulate if not addressed. A leaked qubit will reduce the effectiveness of quantum error correction protocols due to the cost of implementing leakage reduction circuits and the h...
A Silicon Surface Code Architecture Resilient Against Leakage Errors
Z. Cai, M. Fogarty, S. Schaal +3 more·Apr 23, 2019
Spin qubits in silicon quantum dots are one of the most promising building blocks for large scale quantum computers thanks to their high qubit density and compatibility with the existing semiconductor technologies. High fidelity single-qubit gates ex...
Kerdock Codes Determine Unitary 2-Designs
Trung Can, Narayanan Rengaswamy, R. Calderbank +1 more·Apr 16, 2019
The non-linear binary Kerdock codes are known to be Gray images of certain extended cyclic codes of length <inline-formula> <tex-math notation="LaTeX">$N = 2^{m}$ </tex-math></inline-formula> over <inline-formula> <tex-math notation="LaTeX">$\mathbb ...
Toward large-scale fault-tolerant universal photonic quantum computing
S. Takeda, A. Furusawa·Apr 16, 2019
Photonic quantum computing is one of the leading approaches to universal quantum computation. However, large-scale implementation of photonic quantum computing has been hindered by its intrinsic difficulties, such as probabilistic entangling gates fo...
Deterministic Preparation of Dicke States
Andreas Bärtschi, S. Eidenbenz·Apr 15, 2019
The Dicke state $|D_k^n\rangle$ is an equal-weight superposition of all $n$-qubit states with Hamming Weight $k$ (i.e. all strings of length $n$ with exactly $k$ ones over a binary alphabet). Dicke states are an important class of entangled quantum s...
Coherent spin-state transfer via Heisenberg exchange
Y. Kandel, Haifeng Qiao, S. Fallahi +3 more·Apr 10, 2019
Quantum information science has the potential to revolutionize modern technology by providing resource-efficient approaches to computing1, communication2 and sensing3. Although the physical qubits in a realistic quantum device will inevitably suffer ...
C12 - C13 Diamond Quantum Computer with Longitudinal rf-Magnetic Field
G. L'opez, Jorge A. Lizarraga·Apr 10, 2019
It is shown that in the diamond $C^{12}$ structure with a linear chain of $C^{13}$ atoms which is inside a transverse static field, having a gradient along the linear chain and an rf-magnetic field in a plane with a component in the direction of the ...
Polarization of Quantum Channels Using Clifford-Based Channel Combining
F. Dupuis, Ashutosh Goswami, M. Mhalla +1 more·Apr 9, 2019
We provide a purely quantum version of polar codes, achieving the symmetric coherent information of any qubit-input quantum channel. Our scheme relies on a recursive channel combining and splitting construction, where a two-qubit gate randomly chosen...