Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Entanglement Phase Transitions in Measurement-Only Dynamics
Matteo Ippoliti, M. Gullans, S. Gopalakrishnan +2 more·Apr 20, 2020
Unitary circuits subject to repeated projective measurements can undergo an entanglement transition as a function of the measurement rate. This transition is generally understood in terms of a competition between the scrambling effects of unitary dyn...
Experimental simulation of the parity-time symmetric dynamics using photonic qubits
Wei-Chao Gao, Chao Zheng, Lu Liu +2 more·Apr 19, 2020
The concept of parity-time (PT) symmetry originates from the framework of quantum mechanics, where if the Hamiltonian operator satisfies the commutation relation with the parity and time operators, it shows all real eigen-energy spectrum. Recently, P...
Effective gaps are not effective: quasipolynomial classical simulation of obstructed stoquastic Hamiltonians
Jacob Bringewatt, Michael Jarret·Apr 18, 2020
All known examples suggesting an exponential separation between classical simulation algorithms and stoquastic adiabatic quantum computing (StoqAQC) exploit symmetries that constrain adiabatic dynamics to effective, symmetric subspaces. The symmetrie...
SQUARE: Strategic Quantum Ancilla Reuse for Modular Quantum Programs via Cost-Effective Uncomputation
Yongshan Ding, Xin-Chuan Wu, Adam Holmes +4 more·Apr 18, 2020
Compiling high-level quantum programs to machines that are size constrained (i.e. limited number of quantum bits) and time constrained (i.e. limited number of quantum operations) is challenging. In this paper, we present SQUARE (Strategic QUantum Anc...
Switchable Next-Nearest-Neighbor Coupling for Controlled Two-Qubit Operations
Peng Zhao, P. Xu, Dong Lan +3 more·Apr 18, 2020
In a superconducting quantum processor with nearest neighbor coupling, the dispersive interaction between adjacent qubits can result in an effective next-nearest-neighbor coupling for which the strength depends on the state of the intermediary qubit....
Efficient two-electron ansatz for benchmarking quantum chemistry on a quantum computer
Scott E. Smart, D. Mazziotti·Apr 17, 2020
Quantum chemistry provides key applications for near-term quantum computing, but these are greatly complicated by the presence of noise. In this work we present an efficient ansatz for the computation of two-electron atoms and molecules within a hybr...
Quantum ℛ-Matrices as Universal Qubit Gates
N. Kolganov, A. Morozov·Apr 16, 2020
We study the Chern-Simons approach to the topological quantum computing. We use quantum ℛ-matrices as universal quantum gates and study the approximations of some one-qubit operations. We make some modifications to the known Solovay—Kitaev algorithm ...
De-Signing Hamiltonians for Quantum Adiabatic Optimization
E. Crosson, T. Albash, I. Hen +1 more·Apr 16, 2020
Quantum fluctuations driven by non-stoquastic Hamiltonians have been conjectured to be an important and perhaps essential missing ingredient for achieving a quantum advantage with adiabatic optimization. We introduce a transformation that maps every ...
Entanglement is Necessary for Optimal Quantum Property Testing
Sébastien Bubeck, Sitan Chen, J. Li·Apr 16, 2020
There has been a surge of progress in recent years in developing algorithms for testing and learning quantum states that achieve optimal copy complexity [1]–[6]. Unfortunately, they require the use of entangled measurements across many copies of the ...
Accelerating complex control schemes on a heterogeneous MPSoC platform for quantum computing
R. Gebauer, N. Karcher, Jonas Hurst +2 more·Apr 16, 2020
Control and readout of superconducting quantum bits (qubits) require microwave pulses with gigahertz frequencies and nanosecond precision. To generate and analyze these microwave pulses, we developed a versatile FPGA-based electronics platform. While...
Decodable quantum LDPC codes beyond the √n distance barrier using high dimensional expanders
Shai Evra, T. Kaufman, Gilles Z'emor·Apr 16, 2020
Constructing quantum LDPC codes with a minimum distance that grows faster than a square root of the length has been a major challenge of the field. With this challenge in mind, we investigate constructions that come from high-dimensional expanders, i...
Markovianization with approximate unitary designs
Pedro Figueroa–Romero, F. A. Pollock, K. Modi·Apr 16, 2020
Memoryless processes are ubiquitous in nature, in contrast with the mathematics of open systems theory, which states that non-Markovian processes should be the norm. This discrepancy is usually addressed by subjectively making the environment forgetf...
Resource Efficient Chemistry on Quantum Computers with the Variational Quantum Eigensolver and The Double Unitary Coupled-Cluster Approach.
Mekena Metcalf, Nicholas P. Bauman, K. Kowalski +1 more·Apr 16, 2020
Applications of quantum simulation algorithms to obtain electronic energies of molecules on noisy intermediate-scale quantum (NISQ) devices require careful consideration of resources describing the complex electron correlation effects. In modeling se...
Characterizing the memory capacity of transmon qubit reservoirs
S. Dasgupta, Kathleen E. Hamilton, A. Banerjee·Apr 15, 2020
Quantum Reservoir Computing (QRC) exploits the dynamics of quantum ensemble systems for machine learning. Numerical experiments show that quantum systems consisting of 5–7 qubits possess computational capabilities comparable to conventional recurrent...
Pauli Blockade in Silicon Quantum Dots with Spin-Orbit Control
A. Seedhouse, T. Tanttu, R. Leon +12 more·Apr 15, 2020
The conditions to use parity readout, a qubit measurement method applicable in large-scale silicon quantum computing, are established.
Simulating non-native cubic interactions on noisy quantum machines
Yuan Shi, A. Castelli, X. Wu +8 more·Apr 15, 2020
As a milestone for general-purpose computing machines, we demonstrate that quantum processors can be programmed to efficiently simulate dynamics that are not native to the hardware. Moreover, on noisy devices without error correction, we show that si...
Qubit Mapping Based on Subgraph Isomorphism and Filtered Depth-Limited Search
Sanjiang Li, Xiang-Yu Zhou, Yuan Feng·Apr 15, 2020
Mapping logical quantum circuits to Noisy Intermediate-Scale Quantum (NISQ) devices is a challenging problem which has attracted rapidly increasing interests from both quantum and classical computing communities. This article proposes an efficient me...
A Polynomial Interpolation based Quantum Key Reconciliation Protocol: Error Correction without Information Leakage
Günes Karabulut-Kurt, Enver Ozdemir, N. A. Ozkirisci +2 more·Apr 15, 2020
In this work, we propose a novel key reconciliation protocol for the quantum key distribution (QKD). Based on Newton's polynomial interpolation, the proposed protocol aims to correct all erroneous bits at the receiver without revealing information to...
Cellular automaton decoders for topological quantum codes with noisy measurements and beyond
M. Vasmer, D. Browne, Aleksander Kubica·Apr 15, 2020
We propose an error correction procedure based on a cellular automaton, the sweep rule, which is applicable to a broad range of codes beyond topological quantum codes. For simplicity, however, we focus on the three-dimensional toric code on the rhomb...
Quantum Gram-Schmidt processes and their application to efficient state readout for quantum algorithms
Kaining Zhang, Min-Hsiu Hsieh, Liu Liu +1 more·Apr 14, 2020
Many quantum algorithms that claim speed-up over their classical counterparts only generate quantum states as solutions instead of their final classical description. The additional step to decode quantum states into classical vectors normally will des...