QunaSys Tech Blog – Medium

QunaSys Tech Blog

QunaSys Tech Blog

Quantum-Selected Configuration Interaction: Classical Diagonalization of Hamiltonians in Subspaces…

Introduction

4 min readFeb 9, 2024

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Quantum-Selected Configuration Interaction: Classical Diagonalization of Hamiltonians in Subspaces…

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QunaSys Tech Blog

Analytical gradient of energies with a sophisticated calculation method by quantum computers…

Researchers at QunaSys Inc., Osaka University, and Mitsubishi Chemical Co. have developed an algorithm for calculating the gradient of…

5 min readFeb 18, 2022

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Analytical gradient of energies with a sophisticated calculation method by quantum computers…

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QunaSys Tech Blog

Accelerating variational quantum algorithms

A novel way to estimate expectation values on quantum computers

6 min readJan 13, 2022

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Accelerating variational quantum algorithms

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QunaSys Tech Blog

Computing the Green's function on near-term quantum computers

Methods to calculate an indispensable tool in quantum physics

6 min readMar 22, 2021

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Computing the Green's function on near-term quantum computers

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QunaSys Tech Blog

Quantum machine learning of quantum data with NISQ devices

Learning wavefunctions of molecules in quantum chemistry

8 min readFeb 15, 2021

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Quantum machine learning of quantum data with NISQ devices

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QunaSys Tech Blog

Calculating derivatives of molecular electronic energy on a quantum computer

While classical computers have bits representing either 0 or 1 values, quantum computers have qubits which provide arbitrary superposition…

5 min readNov 30, 2020

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Calculating derivatives of molecular electronic energy on a quantum computer

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QunaSys Tech Blog

Comprehensive approach for resolving energy spectrum with symmetry using a quantum computer

“Symmetry” appears everywhere in modern physics, and it plays a significant role in understanding various properties of a quantum system…

7 min readNov 16, 2020

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Comprehensive approach for resolving energy spectrum with symmetry using a quantum computer

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QunaSys Tech Blog

Testing important industrial problems with Honeywell’s Ion-Trap quantum computer

Calculating transition amplitudes of Azobenzene isomers using Honeywell System Model HØ

5 min readNov 2, 2020

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Testing important industrial problems with Honeywell’s Ion-Trap quantum computer

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QunaSys Tech Blog

Quantum algorithm for calculating electronically excited states of molecules

Subspace-Search Variational Quantum Eigensolver

6 min readOct 19, 2020

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Quantum algorithm for calculating electronically excited states of molecules

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QunaSys Tech Blog

Accelerate quantum computation from a classical approach

A simple, efficient, and robust optimizer for NISQ devices

5 min readOct 1, 2020

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Accelerate quantum computation from a classical approach

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QunaSys Tech Blog

QunaSys Tech Blog

Blogs about quantum algorithm developments written by a bunch of quantum native people. Follow to catch up with the most recent quantum news.

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