Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Trellis Decoding for Qudit Stabilizer Codes and Its Application to Qubit Topological Codes
Eric Sabo, Arun B. Aloshious, K. Brown·Jun 15, 2021
Trellis decoders are a general decoding technique first applied to qubit-based quantum error correction codes by Ollivier and Tillich in 2006. Here, we improve the scalability and practicality of their theory, show that it has strong structure, exten...
Towards quantum 3D imaging devices
C. Abbattista, L. Amoruso, Samuel Burri +23 more·Jun 15, 2021
We introduce a new generation of 3D imaging devices based on quantum plenoptic imaging. Position-momentum entanglement and photon number correlations are exploited to provide a scan-free 3D image after post-processing of the collected light intensity...
The role of localizable concurrence in quantum teleportation protocols
M. Consiglio, L. Z. Mangion, T. Apollaro·Jun 12, 2021
Teleporting an unknown qubit state is a paradigmatic quantum information processing task revealing the advantage of quantum communication protocols over their classical counterpart. For a teleportation protocol using a Bell state as quantum channel, ...
Rotation Based Slice Error Correction Protocol for Continuous-variable Quantum Key Distribution and its Implementation with Polar Codes
Xuan Wen, Qiong Li, Haokun Mao +2 more·Jun 11, 2021
Reconciliation is an essential procedure for continuous-variable quantum key distribution (CV-QKD). As the most commonly used reconciliation protocol in short-distance CV-QKD, the slice error correction (SEC) allows a system to distill more than 1 bi...
Perturbative Quantum Simulation.
Jinzhao Sun, Suguru Endo, Hui-wen Lin +3 more·Jun 10, 2021
Approximation based on perturbation theory is the foundation for most of the quantitative predictions of quantum mechanics, whether in quantum many-body physics, chemistry, quantum field theory, or other domains. Quantum computing provides an alterna...
Quantum Carry Lookahead Adders for NISQ and Quantum Image Processing
H. Thapliyal, Edgard Muñoz-Coreas, Vladislav Khalus·Jun 9, 2021
Progress in quantum hardware design is progressing toward machines of sufficient size to begin realizing quantum algorithms in disciplines such as encryption and physics. Quantum circuits for addition are crucial to realize many quantum algorithms on...
CircuitQ: an open-source toolbox for superconducting circuits
Philipp Aumann, Tim Menke, W. Oliver +1 more·Jun 9, 2021
We introduce CircuitQ, an open-source toolbox for the analysis of superconducting circuits implemented in Python. It features the automated construction of a symbolic Hamiltonian of the input circuit and a dynamic numerical representation of the Hami...
Simulating a measurement-induced phase transition for trapped-ion circuits
Stefanie Czischek, G. Torlai, Sayonee Ray +2 more·Jun 7, 2021
The rise of programmable quantum devices has motivated the exploration of circuit models which could realize novel physics. A promising candidate is a class of hybrid circuits, where entangling unitary dynamics compete with disentangling measurements...
Quantum Perceptron Revisited: Computational-Statistical Tradeoffs
Mathieu Roget, G. Molfetta, H. Kadri·Jun 4, 2021
Quantum machine learning algorithms could provide significant speed-ups over their classical coun-terparts; however, whether they could also achieve good generalization remains unclear. Recently, two quantum perceptron models which give a quadratic im...
Benchmarking machine learning algorithms for adaptive quantum phase estimation with noisy intermediate-scale quantum sensors
N. Costa, Omar Yasser, A. Sultanov +1 more·Jun 3, 2021
Quantum phase estimation is a paradigmatic problem in quantum sensing and metrology. Here we show that adaptive methods based on classical machine learning algorithms can be used to enhance the precision of quantum phase estimation when noisy non-ent...
Quasiparticle tunneling and 1/f charge noise in ultrastrongly coupled superconducting qubit and resonator
A. Tomonaga, H. Mukai, F. Yoshihara +1 more·Jun 3, 2021
A. Tomonaga, 2, ∗ H. Mukai, 2 F. Yoshihara, and J. S. Tsai 2, † Department of Physics, Tokyo University of Science, 1–3 Kagurazaka, Shinjuku, Tokyo 162–0825, Japan RIKEN Center for Quantum Computing (RQC), 2–1 Hirosawa, Wako, Saitama 351–0198, Japan ...
Experimental error mitigation using linear rescaling for variational quantum eigensolving with up to 20 qubits
Eliot Rosenberg, P. Ginsparg, P. McMahon·Jun 2, 2021
Quantum computers have the potential to help solve a range of physics and chemistry problems, but noise in quantum hardware currently limits our ability to obtain accurate results from the execution of quantum-simulation algorithms. Various methods h...
Designing Calibration and Expressivity-Efficient Instruction Sets for Quantum Computing
Prakash Murali, L. Lao, M. Martonosi +1 more·Jun 1, 2021
Near-term quantum computing (QC) systems have limited qubit counts, high gate (instruction) error rates, and typically support a minimal instruction set having one type of two-qubit gate (2Q). To reduce program instruction counts and improve applicat...
A comparison of various classical optimizers for a variational quantum linear solver
Aidan Pellow-Jarman, I. Sinayskiy, A. Pillay +1 more·Jun 1, 2021
Variational hybrid quantum classical algorithms are a class of quantum algorithms intended to run on noisy intermediate-scale quantum (NISQ) devices. These algorithms employ a parameterized quantum circuit (ansatz) and a quantum-classical feedback lo...
Towards Solving the Bcs Hamiltonian Gap in Near-Term Quantum Computers
Nahum S'a, I. S. Oliveira, I. Roditi·May 31, 2021
In this work, using a NISQ framework, we obtain the gap of a BCS Hamiltonian. This could lead to interesting implications for superconductivity research. For such task, we choose to use the Variational Quantum Deflation and analyze the hardware restr...
Environmental radiation impact on lifetimes and quasiparticle tunneling rates of fixed-frequency transmon qubits
R. Gordon, C. Murray, C. Kurter +12 more·May 28, 2021
Quantum computing relies on the operation of qubits in an environment as free of noise as possible. This work reports on measuring the impact of environmental radiation on lifetimes of fixed frequency transmon qubits with various capacitor pad geomet...
Engineering fast bias-preserving gates on stabilized cat qubits
Qiang-Da Xu, Joseph K. Iverson, F. Brandão +1 more·May 28, 2021
Stabilized cat codes can provide a biased noise channel with a set of bias-preserving (BP) gates, which can significantly reduce the resource overhead for fault-tolerant quantum computing. All existing schemes of BP gates, however, require adiabatic ...
Improving readout in quantum simulations with repetition codes
Jakob Günther, F. Tacchino, James R. Wootton +2 more·May 27, 2021
Near term quantum computers suffer from the presence of different noise sources. In order to mitigate for this effect and acquire results with significantly better accuracy, there is the urge of designing efficient error correction or error mitigatio...
Testing symmetry on quantum computers
Margarite L. LaBorde, M. Wilde·May 26, 2021
Symmetry is a unifying concept in physics. In quantum information and beyond, it is known that quantum states possessing symmetry are not useful for certain information-processing tasks. For example, states that commute with a Hamiltonian realizing a...
Perspective - On the thermodynamics of perfect unconditional security
Christiana Chamon, L. Kish·May 26, 2021
A secure key distribution (exchange) scheme is unconditionally secure if it is unbreakable against arbitrary technological improvements of computing power and/or any development of new algorithms. There are only two families of experimentally realize...