IBM A1000-128 Practice Exam: Test Your Knowledge 2025

What is the fundamental unit of quantum information in quantum computing?

Which quantum phenomenon allows a qubit to exist in multiple states simultaneously until measured?

A quantum developer needs to create a correlation between two qubits such that measuring one immediately affects the state of the other. Which quantum property should they utilize?

What is the primary challenge caused by decoherence in quantum computing systems?

In quantum computing, what does the Bloch sphere represent?

Which gate is used to create a superposition state from a basis state in a quantum circuit?

What is the primary purpose of the CNOT (Controlled-NOT) gate in quantum circuits?

A quantum algorithm needs to search an unsorted database of N items. Which algorithm provides a quadratic speedup over classical approaches?

What is the time complexity advantage of Shor's algorithm for integer factorization compared to the best known classical algorithms?

In a quantum circuit, what happens when a qubit in superposition is measured?

Which IBM Qiskit component is primarily used to construct and manipulate quantum circuits?

What is the purpose of the transpiler in IBM Qiskit?

Which IBM Quantum service provides access to real quantum hardware for executing quantum circuits?

A developer wants to test their quantum algorithm before running it on real quantum hardware. Which Qiskit simulator should they use for a noise-free simulation?

What information does the quantum volume metric provide about a quantum computer?

Which industry application is quantum computing particularly suited for due to its ability to simulate molecular interactions?

A financial institution wants to optimize a large portfolio with many constraints. Which type of problem does this represent that quantum computing could potentially address?

What is the current limitation that prevents quantum computers from completely replacing classical computers for all computational tasks?

In the context of quantum cryptography, what fundamental quantum principle makes quantum key distribution (QKD) theoretically secure?

A research team is implementing a variational quantum eigensolver (VQE) algorithm. What is the hybrid characteristic of this algorithm?