Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Ray-based framework for state identification in quantum dot devices
J. P. Zwolak, T. McJunkin, Sandesh S. Kalantre +4 more·Feb 23, 2021
Quantum dots (QDs) defined with electrostatic gates are a leading platform for a scalable quantum computing implementation. However, with increasing numbers of qubits, the complexity of the control parameter space also grows. Traditional measurement ...
Robust Control of Quantum Dynamics under Input and Parameter Uncertainty
Andrew Koswara, Vaibhav Bhutoria, R. Chakrabarti·Feb 23, 2021
Despite significant progress in theoretical and laboratory quantum control, engineering quantum systems remains principally challenging due to manifestation of noise and uncertainties associated with the field and Hamiltonian parameters. In this pape...
Reassessing the computational advantage of quantum-controlled ordering of gates
Martin J. Renner, Č. Brukner·Feb 22, 2021
Research on indefinite causal structures is a rapidly evolving field that has a potential not only to make a radical revision of the classical understanding of space-time but also to achieve enhanced functionalities of quantum information processing....
Experimental implementation of quantum gates with one and two qubits using Nuclear Magnetic Resonance
J. Figueiredo·Feb 22, 2021
Nuclear Magnetic Ressonance (NMR) is a widely used technique, with a long history of applications in chemestry, medicine, and material science. Twenty years ago, it emerged as a reliable source for quantum computing too, since the work of Cory. One o...
Subsystem analysis of continuous-variable resource states
Giacomo Pantaleoni, B. Baragiola, N. Menicucci·Feb 21, 2021
Continuous-variable (CV) cluster states are a universal resource for fault-tolerant quantum computation when supplemented with the Gottesman-Kitaev-Preskill (GKP) bosonic code. We generalize the recently introduced subsystem decomposition of a bosoni...
Quantum Gate Pattern Recognition and Circuit Optimization for Scientific Applications
Wonho Jang, K. Terashi, M. Saito +7 more·Feb 19, 2021
There is no unique way to encode a quantum algorithm into a quantum circuit. With limited qubit counts, connectivities, and coherence times, circuit optimization is essential to make the best use of quantum devices produced over a next decade. We int...
Orchestrated trios: compiling for efficient communication in Quantum programs with 3-Qubit gates
Casey Duckering, Jonathan M. Baker, Andrew Litteken +1 more·Feb 16, 2021
Current quantum computers are especially error prone and require high levels of optimization to reduce operation counts and maximize the probability the compiled program will succeed. These computers only support operations decomposed into one- and t...
Quantum Chaos is Quantum
L. Leone, Salvatore F. E. Oliviero, You Zhou +1 more·Feb 16, 2021
It is well known that a quantum circuit on N qubits composed of Clifford gates with the addition of k non Clifford gates can be simulated on a classical computer by an algorithm scaling as poly(N)exp(k)\cite{bravyi2016improved}. We show that, for a ...
Efficient assessment of process fidelity
S. Greenaway, F. Sauvage, K. Khosla +1 more·Feb 16, 2021
The accurate implementation of quantum gates is essential for the realisation of quantum algorithms and digital quantum simulations. This accuracy may be increased on noisy hardware through the variational optimisation of gates, however the experimen...
Low-depth quantum state preparation
Xiao-Ming Zhang, M. Yung, Xiao Yuan·Feb 15, 2021
A crucial subroutine in quantum computing is to load the classical data of $N$ complex numbers into the amplitude of a superposed $n=\lceil \log_2N\rceil$-qubit state. It has been proven that any algorithm universally implementing this subroutine wou...
Pulse-Engineered Controlled-V Gate and Its Applications on Superconducting Quantum Device
Takahiko Satoh, Shun Oomura, M. Sugawara +1 more·Feb 11, 2021
In this article, we demonstrate that, by employing the OpenPulse design kit for IBM superconducting quantum devices, the controlled-V gate (cv gate) can be implemented in about half the gate time to the controlled-X gate (cx or cnot gate) and consequ...
Enabling multi-programming mechanism for quantum computing in the NISQ era
Siyuan Niu, A. Todri·Feb 10, 2021
NISQ devices have several physical limitations and unavoidable noisy quantum operations, and only small circuits can be executed on a quantum machine to get reliable results. This leads to the quantum hardware under-utilization issue. Here, we addres...
Energetic cost of Hamiltonian quantum gates
Sebastian Deffner·Feb 9, 2021
Landauer's principle laid the main foundation for the development of modern thermodynamics of information. However, in its original inception the principle relies on semiformal arguments and dissipative dynamics. Hence, if and how Landauer's principl...
Loss-tolerant concatenated Bell-state measurement with encoded coherent-state qubits for long-range quantum communication
Seok-Hyung Lee, Seung-Woo Lee, Hyunseok Jeong·Feb 8, 2021
The coherent-state qubit is a promising candidate for optical quantum information processing due to its nearly-deterministic nature of the Bell-state measurement (BSM). However, its nonorthogonality incurs difficulties such as failure of the BSM. One...
Quantum Divide and Compute: Exploring the Effect of Different Noise Sources
T. Ayral, François-Marie Le Régent, Zain Saleem +2 more·Feb 7, 2021
Our recent work (Ayral et al. in Proceedings of IEEE computer society annual symposium on VLSI, ISVLSI, pp 138–140, 2020. https://doi.org/10.1109/ISVLSI49217.2020.00034) showed the first implementation of the Quantum Divide and Compute (QDC) method, ...
A quantum-logic gate between distant quantum-network modules
S. Daiss, S. Langenfeld, S. Welte +5 more·Feb 5, 2021
Quantum gating at a distance The processing of quantum information is reliant on the encoding and manipulation of quantum states of a qubit. Superconducting circuits are the most advanced platform at present, but there is an issue with cross-talk bet...
Decomposition of Clifford Gates
Tefjol Pllaha, Kalle Volanto, O. Tirkkonen·Feb 5, 2021
In fault-tolerant quantum computation and quan-tum error-correction one is interested on Pauli matrices that commute with a circuit/unitary. This information is encoded by the support (Pllaha et al., 2020) of the given circuit/unitary. We provide a f...
Effects of quantum resources and noise on the statistical complexity of quantum circuits
Kaifeng Bu, Dax Enshan Koh, Lu Li +2 more·Feb 5, 2021
We investigate how the addition of quantum resources changes the statistical complexity of quantum circuits by utilizing the framework of quantum resource theories. Measures of statistical complexity that we consider include the Rademacher complexity...
Analytic Design of Accelerated Adiabatic Gates in Realistic Qubits: General Theory and Applications to Superconducting Circuits
F. Setiawan, Peter Groszkowski, Hugo Ribeiro +1 more·Feb 4, 2021
Shortcuts to adiabaticity is a general method for speeding up adiabatic quantum protocols, and has many potential applications in quantum information processing. Unfortunately, analytically constructing shortcuts to adiabaticity for systems having co...
Quantum supremacy and hardness of estimating output probabilities of quantum circuits
Yasuhiro Kondo, R. Mori, R. Movassagh·Feb 3, 2021
Motivated by the recent experimental demonstrations of quantum supremacy, proving the hardness of the output of random quantum circuits is an imperative near term goal. We prove under the complexity theoretical assumption of the non-collapse of the p...