Papers
Live trends in quantum computing research, updated daily from arXiv.
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13,302 papers in 12 months (+5% vs prior quarter)
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
High-fidelity two-qubit gates of hybrid superconducting-semiconducting singlet-triplet qubits
Maria Spethmann, S. Bosco, A. Hofmann +2 more·Apr 11, 2023
Hybrid systems comprising superconducting and semiconducting materials are promising architectures for quantum computing. Superconductors induce long-range interactions between the spin degrees of freedom of semiconducting quantum dots. These interac...
Majorization-based benchmark of the complexity of quantum processors
Alexandre B. Tacla, Nina Machado O'Neill, G. Carlo +2 more·Apr 10, 2023
Here, we propose the use of the majorization-based indicator for quantum computation complexity introduced in Vallejos et al. (Phys. Rev. A 104:012602, 2021) as a tool to benchmark the complexity within reach of quantum processors, when taking into a...
Neural-network-assisted quantum state and process tomography using limited data sets
Akshay Gaikwad, Omkar Bihani, Arvind +1 more·Apr 9, 2023
In this study we employ a feed-forward artificial neural network (FFNN) architecture to perform tomography of quantum states and processes obtained from noisy experimental data. To evaluate the performance of the FFNN, we use a heavily reduced data s...
Fourier expansion in variational quantum algorithms
Nikita A. Nemkov, E. Kiktenko, A. Fedorov·Apr 7, 2023
The Fourier expansion of the loss function in variational quantum algorithms (VQA) contains a wealth of information, yet is generally hard to access. We focus on the class of variational circuits, where constant gates are Clifford gates and parameter...
Intermediate-qudit assisted Improved quantum algorithm for string matching with an Advanced Decomposition of Fredkin gate
A. Saha, Om Khanna·Apr 6, 2023
The circuit-level implementation of a quantum string-matching algorithm, which matches a search string (pattern) of length $M$ inside a longer text of length $N$, has already been demonstrated in the literature to outperform its classical counterpart...
Quantum Algorithms for Charged Particle Track Reconstruction in the LUXE Experiment
Arianna Crippa, L. Funcke, T. Hartung +8 more·Apr 4, 2023
The LUXE experiment is a new experiment in planning in Hamburg, which will study quantum electrodynamics at the strong-field frontier. LUXE intends to measure the positron production rate in this unprecedented regime using, among others, a silicon tr...
Comparing planar quantum computing platforms at the quantum speed limit
Daniel Basilewitsch, Clemens Dlaska, W. Lechner·Apr 4, 2023
An important aspect that strongly impacts the experimental feasibility of quantum circuits is the ratio of gate times and typical error time scales. Algorithms with circuit depths that significantly exceed the error time scales will result in faulty ...
Dissipative Protection of a GKP Qubit in a High-Impedance Superconducting Circuit Driven by a Microwave Frequency Comb
Lev-Arcady Sellem·Apr 4, 2023
We propose a novel approach to generate, protect, and control Gottesman-Kitaev-Preskill (GKP) qubits. It employs a microwave frequency comb parametrically modulating a Josephson circuit to enforce a dissipative dynamics of a high-impedance circuit mo...
Break-even point of the phase-flip error correcting code
Áron Rozgonyi, Gábor Széchenyi·Mar 31, 2023
In this theoretical study, we explore the use of quantum code-based memories to enhance the lifetime of qubits and exceed the break-even point, which is critical for the implementation of fault-tolerant quantum computing. Specifically, we investigate...
Fault Tolerant Non-Clifford State Preparation for Arbitrary Rotations
Hyeongrak Choi, F. Chong, D. Englund +1 more·Mar 30, 2023
Quantum error correction is an essential component for practical quantum computing on noisy quantum hardware. However, logical operations on error-corrected qubits require a significant resource overhead, especially for high-precision and high-fideli...
Homomorphic encryption of the k=2 Bernstein–Vazirani algorithm
Pablo Fernández, M. Martin-Delgado·Mar 30, 2023
We introduce a class of circuits that solve a particular case of the Bernstein–Vazirani recursive problem for second-level recursion. This class of circuits allows for the implementation of the oracle using a number of T-gates that grows linearly wit...
Context-aware fidelity estimation
D. Debroy, É. Genois, J. Gross +6 more·Mar 30, 2023
We present Context Aware Fidelity Estimation (CAFE), a framework for benchmarking quantum operations that offers several practical advantages over existing methods such as Randomized Benchmarking (RB) and Cross-Entropy Benchmarking (XEB). In CAFE, a ...
Scalable Heteronuclear Architecture of Neutral Atoms Based on EIT
A. Farouk, I. Beterov, Peng Xu +1 more·Mar 29, 2023
Based on our recent paper [arXiv:2206.12176 (2022)], we propose a scalable heteronuclear architecture of parallel implementation of CNOT gates in arrays of alkali-metal neutral atoms for quantum information processing. We considered a scheme where we...
Proposal for practical Rydberg quantum gates using a native two-photon excitation
Rui Li, J. Qian, Weiping Zhang·Mar 29, 2023
Rydberg quantum gate serving as an indispensable computing unit for neutral-atom quantum computation, has attracted intense research efforts for the last decade. However, the state-of-the-art experiments have not reached the high gate fidelity as pre...
Control of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:mi>Z</mml:mi><mml:mi>Z</mml:mi></mml:math> coupling between Kerr cat qubits via transmon couplers
Takaaki Aoki, T. Kanao, Hayato Goto +2 more·Mar 29, 2023
Kerr-cat qubits are a promising candidate for fault-tolerant quantum computers owing to the biased nature of their errors. The $ZZ$ coupling between the qubits can be utilized for a two-qubit entangling gate, but the residual coupling called $ZZ$ cro...
Multipartite entanglement and quantum error identification in D -dimensional cluster states
Sowrabh Sudevan, Daniel Azses, Emanuele G. Dalla Torre +2 more·Mar 27, 2023
An entangled state is said to be $m$-uniform if the reduced density matrix of any $m$ qubits is maximally mixed. This is intimately linked to pure quantum error correction codes (QECCs), which allow not only to correct errors, but also to identify th...
Transversal diagonal logical operators for stabiliser codes
M. Webster, A. O. Quintavalle, S. Bartlett·Mar 27, 2023
Storing quantum information in a quantum error correction code can protect it from errors, but the ability to transform the stored quantum information in a fault tolerant way is equally important. Logical Pauli group operators can be implemented on C...
All-photonic Gottesman-Kitaev-Preskill–qubit repeater using analog-information-assisted multiplexed entanglement ranking
F. Rozpędek, K. Seshadreesan, P. Polakos +2 more·Mar 27, 2023
Long distance quantum communication will require the use of quantum repeaters to overcome the exponential attenuation of signal with distance. One class of such repeaters utilizes quantum error correction to overcome losses in the communication chann...
Characterizing Crosstalk of Superconducting Transmon Processors
A. Ketterer, T. Wellens·Mar 24, 2023
Currently available quantum computing hardware based on superconducting transmon architectures realizes networks of hundreds of qubits with the possibility of controlled nearest-neighbor interactions. However, the inherent noise and decoherence effec...
One-step implementation of a multi-target-qubit controlled-phase gate with photonic qubits encoded via eigenstates of the photon-number parity operator
Qi-Ping Su, Liang Bin, Yu Zhang +1 more·Mar 23, 2023
In recent years, quantum state engineering and quantum information processing using microwave fields and photons have received increasing attention. In addition, multiqubit gates play an important role in quantum information processing. In this work,...