EPJ Quantum Technology
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Efficient excitation-transfer across fully connected networks via local-energy optimizationAbstract We study the excitation transfer across a fully connected quantum network whose sites energies can be artificially designed. Starting from a simplified model of a broadly-studied physical system, we systematically optimize its local energies to achieve high excitation transfer for various environmental conditions, using an adaptive Gradient Descent techniqu... ... hiện toàn bộ
EPJ Quantum Technology - Tập 11 Số 1 - 2024
Reinforcement learning assisted recursive QAOA
EPJ Quantum Technology - Tập 11 - Trang 1-23 - 2024
In recent years, variational quantum algorithms such as the Quantum Approximation Optimization Algorithm (QAOA) have gained popularity as they provide the hope of using NISQ devices to tackle hard combinatorial optimization problems. It is, however, known that at low depth, certain locality constraints of QAOA limit its performance. To go beyond these limitations, a non-local variant of QAOA, name...... hiện toàn bộ
Ancilla-driven blind quantum computation for clients with different quantum capabilitiesAbstract Blind quantum computation (BQC) allows a client with limited quantum power to delegate his quantum computational task to a powerful server and still keep his input, output, and algorithm private. There are mainly two kinds of models about BQC, namely circuit-based and measurement-based models. In addition, a hybrid model called ancilla-driven universal blin... ... hiện toàn bộ
EPJ Quantum Technology - Tập 10 Số 1 - 2023
On the optimality of quantum circuit initial mapping using reinforcement learning
EPJ Quantum Technology - - 2024
Quantum circuit optimization is an inevitable task with the current noisy quantum backends. This task is considered non-trivial due to the varying circuits’ complexities in addition to hardware-specific noise, topology, and limited connectivity. The currently available methods either rely on heuristics for circuit optimization tasks or reinforcement learning with complex unscalable neural networks...... hiện toàn bộ
Experimenting quantum phenomena on NISQ computers using high level quantum programming
EPJ Quantum Technology - Tập 9 - Trang 1-13 - 2022
We execute the quantum eraser, the Elitzur–Vaidman bomb, and the Hardy’s paradox experiment using high-level programming language on a generic, gate-based superconducting quantum processor made publicly available by IBM. The quantum circuits for these experiments use a mixture of one-qubit and multi-qubit gates and require high entanglement gate accuracy. The results aligned with theoretical predi...... hiện toàn bộ
Fock state-enhanced expressivity of quantum machine learning models
EPJ Quantum Technology - Tập 9 - Trang 1-23 - 2022
The data-embedding process is one of the bottlenecks of quantum machine learning, potentially negating any quantum speedups. In light of this, more effective data-encoding strategies are necessary. We propose a photonic-based bosonic data-encoding scheme that embeds classical data points using fewer encoding layers and circumventing the need for nonlinear optical components by mapping the data poi...... hiện toàn bộ
Repeated radiation damage and thermal annealing of avalanche photodiodes
EPJ Quantum Technology - Tập 8 - Trang 1-12 - 2021
Avalanche photodiodes (APDs) are well-suited for single-photon detection on quantum communication satellites as they are a mature technology with high detection efficiency without requiring cryogenic cooling. They are, however, prone to significantly increased thermal noise caused by in-orbit radiation damage. Previous work demonstrated that a one-time application of thermal annealing reduces radi...... hiện toàn bộ
Gain, noise and intermodulation in a nonlinear superconducting resonator
EPJ Quantum Technology - Tập 1 - Trang 1-10 - 2014
A superconducting microwave resonator is modified with several weak links to make it nonlinear and operated as a phase-insensitive microwave amplifier. Signal gain is demonstrated by intermodulation with a strong pump. The gain is sharply frequency dependent, and we demonstrate phase dependence by examining correlations between the signal and one idler which is a 3rd order intermodulation product ...... hiện toàn bộ
Quantum pricing with a smile: implementation of local volatility model on quantum computer
EPJ Quantum Technology - Tập 9 - Trang 1-32 - 2022
Quantum algorithms for the pricing of financial derivatives have been discussed in recent papers. However, the pricing model discussed in those papers is too simple for practical purposes. It motivates us to consider how to implement more complex models used in financial institutions. In this paper, we consider the local volatility (LV) model, in which the volatility of the underlying asset price ...... hiện toàn bộ
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