Quantum state Archives - IEEE Transactions on Quantum Engineering

Noise Robustness of Quantum Relaxation for Combinatorial Optimization

August 6, 2024Kentaro Tamura, Yohichi Suzuki, Rudy Raymond, Hiroshi C. Watanabe, Yuki Sato, Ruho Kondo, Michihiko Sugawara, Naoki YamamotoQuantum Computer ArchitectureApproximation algorithms, Decoding, Encoding, Noise, Optimization, Quantum state, Qubit

Relaxation is a common way for dealing with combinatorial optimization problems.

Approximate Solutions of Combinatorial Problems via Quantum Relaxations

July 4, 2024Bryce Fuller, Charles Hadfield, Jennifer R. Glick, Takashi Imamichi, Toshinari Itoko, Richard J. Thompson, Yang Jiao, Marna M. Kagele, Adriana W. Blom-Schieber, Rudy Raymond, Antonio MezzacapoRegularApproximate Ratio, Approximate Solution, Binary Optimization, Classification Algorithms, Combinatorial Problem, Cost function, Cut Value, Eigenstates, Energy Relaxation, Estimation Algorithm, Hamiltonian Operator, Numerical Simulations, Optimal Cut, Optimal Objective Value, Pauli Matrices, Quantum computing, Quantum Information, Quantum state, Random Code, Relaxation Spectrum, Relaxed State

This article delves into the role of the quantum Fisher information matrix (FIM) in enhancing the performance of parameterized quantum circuit (PQC)-based reinforcement learning agents. While previous studies have highlighted the effectiveness of PQC-based policies preconditioned with the quantum FIM in contextual bandits, its impact in broader reinforcement learning contexts, such as Markov decision processes, […]

On Quantum Natural Policy Gradients

June 24, 2024André Sequeira, Luis Paulo Santos, Luis Soares Barbosa,Regular, UncategorizedBasic Conditions, Deep Reinforcement Learning, Estimation Error, Expected Value, Fisher Information, Fisher Information Matrix, Gradient Ascent, Gradient Update, Infidelity, Less Than Or Equal, Markov Decision Process, Matrix Inequalities, Natural Gradient, Normal Vector, Optimal Policy, Policy Gradient, Policy Gradient Method, Policy Parameters, Policy Space, Positive Semidefinite Matrix, Preconditioning, Projector, Proximal Policy Optimization, Quantum circuit, Quantum Measurement, Quantum state, Reward Function, Square Root, Standard Gradient, State Space

A Quantum-Classical Collaborative Training Architecture Based on Quantum State Fidelity

February 20, 2024Ryan L'AbbateQuantum ComputingLogic gates, Principal component analysis, Quantum circuit, Quantum computing, Quantum state, Qubit, Tensors

Recent advancements have highlighted the limitations of current quantum systems, particularly the restricted number of qubits available on near-term quantum devices. This constraint greatly inhibits the range of applications that can leverage quantum computers. Moreover, as the available qubits increase, the computational complexity grows exponentially, posing additional challenges. Consequently, there is an urgent need to […]

Parallelizing Quantum Simulation With Decision Diagrams

February 9, 2024Shaowen Li; Yusuke Kimura; Hiroyuki Sato; Masahiro FujitaQuantum SoftwareMemory management, Quantum computing, Quantum simulation, Quantum state, Qubit, Task analysis, Tensors

Since people became aware of the power of quantum phenomena in the domain of traditional computation, a great number of complex problems that were once considered intractable in the classical world have been tackled. The downsides of quantum supremacy are its high cost and unpredictability. Numerous researchers are relying on quantum simulators running on classical […]

Continuous-Variable Quantum Secret Sharing in Fast-Fluctuating Channels

October 9, 2023Fangli YangQuantum Networking & CommunicationsChannel estimation, Detectors, Particle measurements, Probability distribution, Protocols, Quantum state, Security

Recently, several continuous-variable quantum secret sharing (CV-QSS) protocols were proposed, while most of them are limited to the fiber channel systems with a relatively stable transmissivity. However, by means of complex channels, the transmissivity fluctuates dramatically in time with a probability distribution, which will lead to a fast-fluctuating attack. Therefore, the security analysis of CV-QSS […]

Private Product Computation Using Quantum Entanglement

September 27, 2023René Bødker ChristensenQuantum ComputingCryptography, Encoding, Galois fields, Indexes, Protocols, Quantum state, Qubit

In this article, we show that a pair of entangled qubits can be used to compute a product privately. More precisely, two participants with a private input from a finite field can perform local operations on a shared, Bell-like quantum state, and when these qubits are later sent to a third participant, the third participant […]

Corrections to “Linear Quantum State Observers”

June 14, 2023Maison ClouâtréElectromagneticsObservers, Quantum state

Presents corrections to the paper, Corrections to “Linear Quantum State Observers”. For more about this article see link below. https://ieeexplore.ieee.org/document/10148092 For the open access PDF link of this article please click.

A Low-Complexity Quantum Simulation Framework for Toeplitz-Structured Matrix and Its Application in Signal Processing

June 14, 2023Mostafizur Rahaman LaskarEnabling TechnologiesComputational modeling, Covariance matrices, Eigenvalues and eigenfunctions, Estimation, Quantum computing, Quantum state, Sparse matrices

Toeplitz matrix reconstruction algorithms (TMRAs) are one of the central subroutines in array processing for wireless communication applications. The classical TMRAs have shown excellent accuracy in the spectral estimation for both uncorrelated and coherence sources in the recent era. However, TMRAs incorporate the classical eigenvalue decomposition technique for estimating the eigenvalues of the Toeplitz-structured covariance […]

Perfect and Quasi-Perfect Codes for the Bosonic Classical-Quantum Channel

March 30, 2023Andreu Blasco CollQuantum InformationCodes, Eigenvalues and eigenfunctions, Error probability, Indexes, Quantum channels, Quantum state, Testing

In this article, we explore perfect and quasi-perfect codes for the Bosonic channel, where information is generated by a laser and conveyed in the form of coherent states. In particular, we consider the phase-modulation codebook for coherent states in a Bosonic channel. We show that these phase-modulation codes are quasi-perfect as long as the cardinality […]