QubitHub

Circuit Repository

Browse reproducible quantum circuits with rich metadata.
52 TOTAL CIRCUITS

Circuits (52)

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/expressibility
00

Expressibility Analysis

Expressibility Analysis Overview Expressibility measures how uniformly a variational ansatz can cover the Hilbert space....

AdvancedAnsatz+4
cirq40
/knapsack
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QAOA for Knapsack

QAOA for 0/1 Knapsack Problem Overview The knapsack problem is a classic optimization problem: given a set of items with...

IntermediateOptimization+3
qiskit30
/multistate-vqe
00

Multistate VQE

Multistate Contracted VQE (MC-VQE) Overview MC-VQE is a multi-reference approach for strongly correlated systems. Instea...

AdvancedChemistry+3
qiskit40
/quantum-kernel
00

Quantum Kernel Estimation

Quantum Kernel Estimation Overview Quantum kernels measure similarity between data points in a high-dimensional quantum ...

IntermediateMachine_Learning+4
qiskit20
/h2-ground-state
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VQE for H2 Molecule

VQE for H2 Molecule Ground State Overview The Variational Quantum Eigensolver (VQE) is a hybrid quantum-classical algori...

IntermediateChemistry+3
qiskit20
/uccsd-ansatz
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UCCSD Ansatz

UCCSD Ansatz Overview The Unitary Coupled Cluster Singles and Doubles (UCCSD) ansatz is the gold standard for quantum ch...

AdvancedAnsatz+3
cirq40
/ssvqe
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SSVQE Algorithm

Subspace-Search VQE (SSVQE) Overview SSVQE finds multiple eigenstates simultaneously in a single optimization, unlike VQ...

AdvancedChemistry+3
qiskit40
/shor-code
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Shor's 9-Qubit Code

Shor's 9-Qubit Code Overview Shor's code is the first quantum error correcting code capable of correcting any single-qub...

IntermediateError_Correction+4
qiskit90
/quantum-fourier-transform
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Quantum Fourier Transform

Quantum Fourier Transform (QFT) Overview The Quantum Fourier Transform maps quantum states to the frequency domain. It's...

BeginnerTransform+3
qiskit40
/steane-code
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Steane's 7-Qubit Code

Steane's 7-Qubit Code Overview Steane's code is a [[7,1,3]] quantum error correcting code, meaning it encodes 1 logical ...

IntermediateError_Correction+4
qiskit70
/angle-encoding
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Angle Encoding

Angle Encoding (Rotation Encoding) Overview Angle encoding is the simplest quantum data encoding method: each classical ...

IntermediateMachine_Learning+4
qiskit40
/vqe-h2-peruzzo
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VQE H2 (Peruzzo 2014)

VQE H2 Ground State - Peruzzo et al. 2014 Overview Reproduction of the original VQE paper - the first experimental demon...

AdvancedResearch+4
qiskit20
/qaoa-mixer
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QAOA Mixer Ansatz

QAOA Mixer Ansatz Overview The Quantum Approximate Optimization Algorithm (QAOA) uses alternating cost and mixer layers....

AdvancedAnsatz+4
cirq40
/bit-flip-code
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3-Qubit Bit Flip Code

3-Qubit Bit-Flip Code Overview The 3-qubit bit-flip code is the simplest quantum error correcting code. It protects agai...

IntermediateError_Correction+3
qiskit30
/kernel-alignment
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Kernel-Target Alignment

Kernel Target Alignment Optimization Overview Optimizes quantum kernel parameters to maximize centered kernel-target ali...

AdvancedMachine_Learning+5
pennylane40
/hardware-efficient-ansatz
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Hardware-Efficient Ansatz

Hardware-Efficient Ansatz Overview Hardware-efficient ansatze (HEA) are variational circuits designed for NISQ devices, ...

AdvancedAnsatz+3
cirq40
/quantum-advantage-kernel
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Quantum Kernel Advantage (Huang 2021)

Quantum Advantage in Learning - Huang et al. 2021 Overview Reproduction of the quantum kernel advantage paper - proving ...

AdvancedResearch+4
qiskit40
/portfolio-optimization
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QAOA for Portfolio

QAOA for Portfolio Optimization Overview Portfolio optimization is a fundamental problem in finance: select assets to ma...

IntermediateOptimization+3
qiskit40
/graph-coloring
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QAOA for Graph Coloring

QAOA for Graph Coloring Overview Graph coloring assigns colors to vertices such that no two adjacent vertices share the ...

IntermediateOptimization+3
qiskit40
/h2o-ground-state
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VQE for H2O Molecule

VQE for H2O Molecule (Active Space) Overview Water (H₂O) is a 10-electron system that would require ~14 qubits for full ...

IntermediateChemistry+4
qiskit40