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Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
High-dimensional quantum encoding via photon-subtracted squeezed states
F. Arzani, A. Ferraro, V. Parigi·Nov 22, 2018
We introduce a high-dimensional quantum encoding based on coherent mode-dependent single-photon subtraction from multimode squeezed states. This encoding can be seen as a generalization to the case of non-zero squeezing of the standard single-photon ...
Cyclic permutations for qudits in d dimensions
T. Isdrailă, C. Kusko, R. Ionicioiu·Nov 22, 2018
One of the main challenges in quantum technologies is the ability to control individual quantum systems. This task becomes increasingly difficult as the dimension of the system grows. Here we propose a general setup for cyclic permutations Xd in d di...
Universal quantum computation in the surface code using non-Abelian islands
K. Laubscher, D. Loss, James R. Wootton·Nov 16, 2018
The surface code is currently the primary proposed method for performing quantum error correction. However, despite its many advantages, it has no native method to fault-tolerantly apply non-Clifford gates. Additional techniques are therefore require...
Faster manipulation of large quantum circuits using wire label reference diagrams
A. Paler, A. Fowler, R. Wille·Nov 14, 2018
Abstract Large scale quantum computing is highly anticipated, and quantum circuit design automation needs to keep up with the transition from small scale to large scale problems. Methods to support fast quantum circuit manipulations (e.g. gate replac...
Geometric formalism for constructing arbitrary single-qubit dynamically corrected gates
Junkai Zeng, C. Yang, A. Dzurak +1 more·Nov 12, 2018
Implementing high-fidelity quantum control and reducing the effect of the coupling between a quantum system and its environment is a major challenge in developing quantum information technologies. Here, we show that there exists a geometrical structu...
Finding the ground state of the Hubbard model by variational methods on a quantum computer with gate errors
Jan-Michael Reiner, F. Wilhelm-Mauch, G. Schön +1 more·Nov 11, 2018
A key goal of digital quantum computing is the simulation of fermionic systems such as molecules or the Hubbard model. Unfortunately, for present and near-future quantum computers the use of quantum error correction schemes is still out of reach. Hen...
Robust quantum compilation and circuit optimisation via energy minimisation
Tyson Jones, S. Benjamin·Nov 7, 2018
We explore a method for automatically recompiling a quantum circuit A into a target circuit B, with the goal that both circuits have the same action on a specific input i.e. B∣in⟩=A∣in⟩. This is of particular relevance to hybrid, NISQ-era algorithms ...
Genuine 12-Qubit Entanglement on a Superconducting Quantum Processor.
M. Gong, Ming-Cheng Chen, Yarui Zheng +20 more·Nov 6, 2018
We report the preparation and verification of a genuine 12-qubit entanglement in a superconducting processor. The processor that we designed and fabricated has qubits lying on a 1D chain with relaxation times ranging from 29.6 to 54.6 μs. The fideli...
Computational Assessment of Silicon Quantum Gate Based on Detuning Mechanism for Quantum Computing
Tong Wu, Jing Guo·Nov 2, 2018
Silicon-based quantum computing has the potential advantages of low cost, high integration density, and compatibility with CMOS technologies. The detuning mechanism has been used to experimentally achieve silicon two-qubit quantum gates and programma...
Demonstration of a Quantum Circuit Design Methodology for Multiple Regression
Sanchayan Dutta, Adrien Suau, Sagnik Dutta +3 more·Nov 1, 2018
Multiple linear regression, one of the most fundamental supervised learning algorithms, assumes an imperative role in the field of machine learning. In 2009, Harrow et al. [Phys. Rev. Lett. 103, 150502 (2009)] showed that their algorithm could be use...
Parallel entangling operations on a universal ion-trap quantum computer
C. Figgatt, Aaron Ostrander, N. Linke +4 more·Oct 29, 2018
The circuit model of a quantum computer consists of sequences of gate operations between quantum bits (qubits), drawn from a universal family of discrete operations1. The ability to execute parallel entangling quantum gates offers efficiency gains in...
Emulating quantum computation with artificial neural networks.
Christian Pehle, K. Meier, M. Oberthaler +1 more·Oct 24, 2018
We demonstrate, that artificial neural networks (ANN) can be trained to emulate single or multiple basic quantum operations. In order to realize a quantum state, we implement a novel "quantumness gate" that maps an arbitrary matrix to the real repres...
Generalized Ramsey interferometry explored with a single nuclear spin qudit
C. Godfrin, R. Ballou, E. Bonet +4 more·Oct 24, 2018
Qudits, with their state space of dimension d > 2, open fascinating experimental prospects. The quantum properties of their states provide new potentialities for quantum information, quantum contextuality, expressions of geometric phases, facets of q...
Code deformation and lattice surgery are gauge fixing
Christophe Vuillot, L. Lao, B. Criger +3 more·Oct 23, 2018
The large-scale execution of quantum algorithms requires basic quantum operations to be implemented fault-tolerantly. The most popular technique for accomplishing this, using the devices that can be realized in the near term, uses stabilizer codes wh...
Controlling error orientation to improve quantum algorithm success rates
Daniel Murphy, K. Brown·Oct 17, 2018
The success probability of a quantum algorithm constructed from noisy quantum gates cannot be accurately predicted from single parameter metrics that compare noisy and ideal gates. We illustrate this concept by examining a system with coherent errors...
Minimal nonorthogonal gate decomposition for qubits with limited control
Xiao-Ming Zhang, Jianan Li, Xin Wang +1 more·Oct 17, 2018
In quantum control theory, a question of fundamental and practical interest is how an arbitrary unitary transformation can be decomposed into minimum number of elementary rotations for implementation, subject to various physical constraints. Examples...
Probing Context-Dependent Errors in Quantum Processors
K. Rudinger, T. Proctor, Dylan Langharst +3 more·Oct 12, 2018
Gates in error-prone quantum information processors are often modeled using sets of one- and two-qubit process matrices, the standard model of quantum errors. However, the results of quantum circuits on real processors often depend on additional exte...
Delegating Quantum Computation in the Quantum Random Oracle Model
Jiayu Zhang·Oct 11, 2018
A delegation scheme allows a computationally weak client to use a server's resources to help it evaluate a complex circuit without leaking any information about the input (other than its length) to the server. In this paper, we consider delegation sc...
Demonstration of Controlled-Phase Gates between Two Error-Correctable Photonic Qubits.
Yuan Xu, Yuwei Ma, W. Cai +11 more·Oct 10, 2018
To realize fault-tolerant quantum computing, it is necessary to store quantum information in logical qubits with error correction functions, realized by distributing a logical state among multiple physical qubits or by encoding it in the Hilbert spac...
Efficient unitary paths and quantum computational supremacy: A proof of average-case hardness of Random Circuit Sampling
R. Movassagh·Oct 10, 2018
One-parameter interpolations between any two unitary matrices (e.g., quantum gates) $U_1$ and $U_2$ along efficient paths contained in the unitary group are constructed. Motivated by applications, we propose the continuous unitary path $U(\theta)$ ob...