QubitHub

Circuit Repository

Browse reproducible quantum circuits with rich metadata.
50 TOTAL CIRCUITS

Circuits (50)

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/ssvqe
00

SSVQE Algorithm

Subspace-Search VQE (SSVQE) What You'll Learn: How to find multiple eigenstates in a single optimization, not sequential...

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
/quantum-teleportation
10

Quantum Teleportation

Quantum Teleportation What You'll Learn: How to transfer a quantum state from one qubit to another using a shared entang...

BeginnerCommunication+2
qiskit31
/portfolio-optimization
00

QAOA for Portfolio

QAOA for Portfolio Optimization What You'll Learn: How to encode financial portfolio selection as a QUBO problem on a qu...

IntermediateOptimization+3
qiskit40
/superdense-coding
00

Superdense Coding

Superdense Coding What You'll Learn: How to send 2 classical bits of information by transmitting only 1 qubit — using a ...

BeginnerCommunication+2
qiskit22
/vqe-h2-peruzzo
00

VQE H2 (Peruzzo 2014)

VQE H2 Ground State — Peruzzo et al. 2014 First-ever experimental VQE on a photonic quantum processor Finds the ground-s...

AdvancedResearch+4
qiskit20
/trainable-kernel
00

Trainable Quantum Kernel

Trainable Quantum Kernel — KTA Optimization What You'll Learn: How adding learnable parameters to a quantum feature map ...

AdvancedMachine_Learning+4
pennylane40
/bernstein-vazirani
00

Bernstein-Vazirani Algorithm

Bernstein-Vazirani Algorithm What You'll Learn: How to extract a hidden bit string from a black-box function using a sin...

BeginnerAlgorithm+4
qiskit42
/hadamard-test
00

Hadamard Test

Hadamard Test > Prerequisites: Bell State (entanglement, controlled gates, measurement) The Idea Imagine you are given a...

IntermediateUtility+3
qiskit22
/deutsch-jozsa
00

Deutsch-Jozsa Algorithm

Deutsch-Jozsa Algorithm What You'll Learn: How quantum parallelism and interference combine to solve a problem with one ...

BeginnerAlgorithm+4
qiskit33
/hardware-efficient-ansatz
00

Hardware-Efficient Ansatz

Hardware-Efficient Ansatz (HEA) A parameterized quantum circuit designed for NISQ devices that uses native gate sets and...

AdvancedAnsatz+3
cirq45
/ghz-state
10

GHZ State

GHZ State What You'll Learn: How to extend quantum entanglement beyond two qubits, creating an "all-or-nothing" correlat...

BeginnerEntanglement+2
qiskit33
/steane-code
00

Steane's 7-Qubit Code

Steane's 7-Qubit Code Overview Steane's code is a [[7,1,3]] CSS code — it encodes 1 logical qubit into 7 physical qubits...

IntermediateError_Correction+4
qiskit72
/qaoa-maxcut-farhi
00

QAOA MaxCut (Farhi 2014)

QAOA MaxCut - Farhi, Goldstone, Gutmann (2014) Overview Faithful reproduction of the paper that introduced QAOA — the Qu...

AdvancedResearch+4
cirq40
/barren-plateaus
00

Barren Plateau Detection

Barren Plateau Detection and Analysis What You'll Learn: Why gradient variance vanishes exponentially with qubit count i...

AdvancedAnsatz+4
cirq60
/expressibility
00

Expressibility Analysis

Expressibility Analysis of Variational Quantum Ansatze Overview Expressibility quantifies how uniformly a parameterized ...

AdvancedAnsatz+4
cirq40
/multistate-vqe
00

Multistate VQE

Multistate Contracted VQE (MC-VQE) What You'll Learn: How to find multiple eigenstates simultaneously using a contracted...

AdvancedChemistry+3
qiskit40
/kernel-alignment
00

Kernel-Target Alignment

Kernel-Target Alignment Optimization What You'll Learn: How centered kernel-target alignment (CKA) measures how well a k...

AdvancedMachine_Learning+5
pennylane40
/h2o-ground-state
00

VQE for H2O Molecule

VQE for H2O Molecule Ground State What You'll Learn: How active space reduction brings a 10-electron molecule down to 4 ...

IntermediateChemistry+4
qiskit40
/lih-ground-state
00

VQE for LiH Molecule

VQE for LiH Molecule Ground State What You'll Learn: How to scale VQE from 2 qubits (H2) to 4 qubits (LiH) How hardware-...

IntermediateChemistry+3
qiskit40