Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Multiport based teleportation - transmission of a large amount of quantum information
Piotr Kopszak, M. Mozrzymas, M. Studzi'nski +1 more·Aug 3, 2020
We analyse the problem of transmitting a number of unknown quantum states or one composite system in one go. We derive a lower bound on the performance of such process, measured in the entanglement fidelity. The obtained bound is effectively computab...
Short Codes for Quantum Channels With One Prevalent Pauli Error Type
M. Chiani, L. Valentini·Aug 1, 2020
One of the main problems in quantum information systems is the presence of errors due to noise, and for this reason quantum error-correcting codes (QECCs) play a key role. While most of the known codes are designed for correcting generic errors, i.e....
Experimental semi-autonomous eigensolver using reinforcement learning
ComputationsVictor Y. Pan, M. Hao, N. Barraza +2 more·Jul 30, 2020
The characterization of observables, expressed via Hermitian operators, is a crucial task in quantum mechanics. For this reason, an eigensolver is a fundamental algorithm for any quantum technology. In this work, we implement a semi-autonomous algori...
Noise Reduction in Qubit Readout with a Two-Mode Squeezed Interferometer
G. Liu, X. Cao, T. Chien +3 more·Jul 30, 2020
Fault-tolerant quantum information processing with flawed qubits and gates requires highly efficient, quantum non-demolition (QND) qubit readout. In superconducting circuits, qubit readout using coherent light with fidelity above 99% has been achieve...
Geometrical Formalism for Dynamically Corrected Gates in Multiqubit Systems
Donovan Buterakos, Sankar Das Sarma, Edwin Barnes·Jul 30, 2020
The ability to perform gates in multiqubit systems that are robust to noise is of crucial importance for the advancement of quantum information technologies. However, finding control pulses that cancel noise while performing a gate is made difficult ...
Qudits and High-Dimensional Quantum Computing
Yuchen Wang, Zixuan Hu, B. Sanders +1 more·Jul 30, 2020
Qudit is a multi-level computational unit alternative to the conventional 2-level qubit. Compared to qubit, qudit provides a larger state space to store and process information, and thus can provide reduction of the circuit complexity, simplification...
Quantum algorithm for online convex optimization
Jianhao He, Feidiao Yang, Jialin Zhang +1 more·Jul 29, 2020
We explore whether quantum advantages can be found for the zeroth-order online convex optimization (OCO) problem, which is also known as bandit convex optimization with multi-point feedback. In this setting, given access to zeroth-order oracles (that...
Enhanced Quantum Key Distribution using Hybrid Channels and Natural Random Numbers
Hemant Rana, Nitin Verma·Jul 28, 2020
Since the introduction of quantum computation by Richard Feynman in 1982, Quantum computation has shown exemplary results in various applications of computer science including unstructured database search, factorization, molecular simulations to name...
Quantum Go Machine
Lu-Feng Qiao, Jun Gao, Zhi-Qiang Jiao +9 more·Jul 23, 2020
Go has long been considered as a testbed for artificial intelligence. By introducing certain quantum features, such as superposition and collapse of wavefunction, we experimentally demonstrate a quantum version of Go by using correlated photon pair...
The Rayleigh-Lorentz Invariant and Optimal Adiabatic Qubit-Information Detection for Superconducting Qubit Resonators
J. Choi·Jul 21, 2020
Dynamical properties of a resonator can be analyzed using the Rayleigh-Lorentz invariant which is not an exact constant but varies more or less over time. We investigate the time behavior of this invariant for a flux qubit resonator in order for bett...
High-fidelity two-qubit gates in silicon above one Kelvin.
L. Petit, M. Russ, H. Eenink +4 more·Jul 17, 2020
Spin qubits in quantum dots define an attractive platform for scalable quantum information because of their compatibility with semiconductor manufacturing, their long coherence times, and the ability to operate at temperatures exceeding one Kelvin. Q...
Electrical control of coherent spin rotation of a single-spin qubit
Xiaoche Wang, Yuxuan Xiao, Chuanpu Liu +7 more·Jul 15, 2020
Nitrogen vacancy (NV) centers, optically active atomic defects in diamond, have attracted tremendous interest for quantum sensing, network, and computing applications due to their excellent quantum coherence and remarkable versatility in a real, ambi...
Quantum Key Distribution Over Quantum Repeaters with Encoding: Using Error Detection as an Effective Postselection Tool
Yumang Jing, D. Alsina, M. Razavi·Jul 13, 2020
We propose a post-selection technique, based on quantum error detection, for quantum key distribution (QKD) systems that run over quantum repeaters with encoding. In such repeaters, quantum error correction techniques are used for entanglement distil...
Quantum error-correcting codes and their geometries
Simeon Ball, Aina Centelles, Felix Huber·Jul 12, 2020
This is an expository article aiming to introduce the reader to the underlying mathematics and geometry of quantum error correction. Information stored on quantum particles is subject to noise and interference from the environment. Quantum error-corr...
Sampling random quantum circuits: a pedestrian's guide
Sean Mullane·Jul 10, 2020
Recent experiments completed by collaborating research groups from Google, NASA Ames, UC Santa Barbara, and others provided compelling evidence that quantum supremacy has finally been achieved on a superconducting quantum processor. The theoretical b...
Adiabatic quantum state transfer in a semiconductor quantum-dot spin chain
Y. Kandel, Haifeng Qiao, S. Fallahi +3 more·Jul 8, 2020
Semiconductor quantum-dot spin qubits are a promising platform for quantum computation, because they are scalable and possess long coherence times. In order to realize this full potential, however, high-fidelity information transfer mechanisms are re...
A Quantum Finite Automata Approach to Modeling the Chemical Reactions
A. Bhatia, Shenggen Zheng·Jul 8, 2020
In recent years, the modeling interest has increased significantly from molecular level to atomic and quantum levels. Computational chemistry plays a significant role in designing computational models for the operation and simulation of systems rangi...
Statistical mechanics of quantum error correcting codes
Yaodong Li, M. Fisher·Jul 7, 2020
We study stabilizer quantum error-correcting codes (QECC) generated under hybrid dynamics of local Clifford unitaries and local Pauli measurements in one dimension. Building upon 1) a general formula relating the error-susceptibility of a subregion t...
Wishart and random density matrices: Analytical results for the mean-square Hilbert-Schmidt distance
Santosh Kumar·Jul 6, 2020
Hilbert-Schmidt distance is one of the prominent distance measures in quantum information theory which finds applications in diverse problems, such as construction of entanglement witnesses, quantum algorithms in machine learning, and quantum-state t...
On Actual Preparation of Dicke State on a Quantum Computer
Chandra Sekhar Mukherjee, S. Maitra, V. Gaurav +1 more·Jul 3, 2020
The exact number of CNOT and single qubit gates needed to implement a Quantum Algorithm in a given architecture is one of the central problems of Quantum Computation. In this work we study the importance of concise realizations of Partially defined U...