**Quantum Information Processing MCQs** are very important test and often asked by various testing services and competitive exams around the world. Here you will find all the Important **Quantum Information Processing MCQs** for Preparation.

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**Quantum Information Processing Online MCQs with Answers**

What is the fundamental unit of quantum information?

a) Qubit

b) Bit

c) Quantum gate

d) Quantum circuit

In quantum computing, a qubit can exist in:

a) Only the state 0

b) Only the state 1

c) Both the states 0 and 1 simultaneously

d) Neither the state 0 nor 1

Which property of qubits allows for quantum superposition?

a) Entanglement

b) Coherence

c) Decoherence

d) Measurement

What is the term used for the entanglement of qubits across long distances?

a) Quantum teleportation

b) Quantum entanglement

c) Quantum superposition

d) Quantum gate

Which principle states that the act of measuring a qubit collapses its superposition into a definite state?

a) Pauli exclusion principle

b) Heisenberg uncertainty principle

c) Measurement principle

d) No-cloning theorem

What is the term used for the basic operations performed on qubits in quantum computing?

a) Quantum gates

b) Quantum circuits

c) Quantum algorithms

d) Quantum measurements

Which quantum gate is equivalent to the classical NOT gate?

a) Hadamard gate

b) Pauli-X gate

c) CNOT gate

d) Toffoli gate

What is the term used for the process of encoding information into a quantum state?

a) Quantum measurement

b) Quantum error correction

c) Quantum encoding

d) Quantum superposition

Which property of qubits allows for quantum teleportation?

a) Entanglement

b) Coherence

c) Decoherence

d) Measurement

Which quantum algorithm provides exponential speedup for factoring large numbers?

a) Grover’s algorithm

b) Shor’s algorithm

c) Quantum Fourier transform

d) Deutsch-Jozsa algorithm

Which principle states that it is impossible to clone an unknown quantum state perfectly?

a) Pauli exclusion principle

b) Heisenberg uncertainty principle

c) No-cloning theorem

d) Measurement principle

Which type of quantum error correction code is used to protect qubits from arbitrary errors?

a) Stabilizer codes

b) Topological codes

c) Concatenated codes

d) Surface codes

Which property of qubits allows for quantum teleportation?

a) Entanglement

b) Coherence

c) Decoherence

d) Measurement

Which quantum gate is used to create superposition?

a) Hadamard gate

b) Pauli-X gate

c) CNOT gate

d) Toffoli gate

Which property of qubits allows for quantum entanglement?

a) Entanglement

b) Coherence

c) Decoherence

d) Measurement

Which quantum algorithm is used for searching an unsorted database with a quadratic speedup?

a) Grover’s algorithm

b) Shor’s algorithm

c) Quantum Fourier transform

d) Deutsch-Jozsa algorithm

Which principle states that the more precisely the position of a particle is known, the less precisely its momentum can be known?

a) Pauli exclusion principle

b) Heisenberg uncertainty principle

c) Measurement principle

d) No-cloning theorem

Which property of qubits is susceptible to environmental disturbances and leads to loss of quantum coherence?

a) Entanglement

b) Coherence

c) Decoherence

d) Measurement

Which type of quantum gate is used to perform controlled-NOT operations?

a) Hadamard gate

b) Pauli-X gate

c) CNOT gate

d) Toffoli gate

Which principle states that the state of a quantum system remains constant during the unitary evolution?

a) Pauli exclusion principle

b) Heisenberg uncertainty principle

c) Measurement principle

d) Schrödinger’s equation

Which type of quantum error correction code is based on non-Abelian anyons?

a) Stabilizer codes

b) Topological codes

c) Concatenated codes

d) Surface codes

Which property of qubits allows for the possibility of quantum parallelism?

a) Entanglement

b) Coherence

c) Decoherence

d) Measurement

Which quantum gate is used to perform a controlled-phase shift?

a) Hadamard gate

b) Pauli-Z gate

c) CNOT gate

d) Toffoli gate

Which principle states that the act of measuring a qubit does not disturb its superposition?

a) Pauli exclusion principle

b) Heisenberg uncertainty principle

c) Measurement principle

d) No-cloning theorem

Which type of quantum error correction code is obtained by concatenating multiple smaller codes?

a) Stabilizer codes

b) Topological codes

c) Concatenated codes

d) Surface codes

Which property of qubits allows for quantum teleportation?

a) Entanglement

b) Coherence

c) Decoherence

d) Measurement

Which quantum algorithm is used for solving problems with a yes/no answer with a single query?

a) Grover’s algorithm

b) Shor’s algorithm

c) Quantum Fourier transform

d) Deutsch-Jozsa algorithm

Which principle states that it is impossible to simultaneously know the precise values of complementary variables of a quantum system?

a) Pauli exclusion principle

b) Heisenberg uncertainty principle

c) Measurement principle

d) No-cloning theorem

Which property of qubits allows for quantum entanglement?

a) Entanglement

b) Coherence

c) Decoherence

d) Measurement

Which quantum gate is used to perform a controlled-Hadamard operation?

a) Hadamard gate

b) Pauli-X gate

c) CNOT gate

d) Toffoli gate

Which principle states that the act of measuring a qubit collapses its superposition into a definite state?

a) Pauli exclusion principle

b) Heisenberg uncertainty principle

c) Measurement principle

d) No-cloning theorem

Which type of quantum error correction code is used to protect qubits from arbitrary errors?

a) Stabilizer codes

b) Topological codes

c) Concatenated codes

d) Surface codes

a) Entanglement

b) Coherence

c) Decoherence

d) Measurement

Which quantum gate is used to create superposition?

a) Hadamard gate

b) Pauli-X gate

c) CNOT gate

d) Toffoli gate

Which property of qubits allows for quantum entanglement?

a) Entanglement

b) Coherence

c) Decoherence

d) Measurement

Which quantum algorithm is used for searching an unsorted database with a quadratic speedup?

a) Grover’s algorithm

b) Shor’s algorithm

c) Quantum Fourier transform

d) Deutsch-Jozsa algorithm

Which principle states that the more precisely the position of a particle is known, the less precisely its momentum can be known?

a) Pauli exclusion principle

b) Heisenberg uncertainty principle

c) Measurement principle

d) No-cloning theorem

Which property of qubits is susceptible to environmental disturbances and leads to loss of quantum coherence?

a) Entanglement

b) Coherence

c) Decoherence

d) Measurement

Which type of quantum gate is used to perform controlled-NOT operations?

a) Hadamard gate

b) Pauli-X gate

c) CNOT gate

d) Toffoli gate

Which principle states that the state of a quantum system remains constant during the unitary evolution?

a) Pauli exclusion principle

b) Heisenberg uncertainty principle

c) Measurement principle

d) Schrödinger’s equation

Which type of quantum error correction code is based on non-Abelian anyons?

a) Stabilizer codes

b) Topological codes

c) Concatenated codes

d) Surface codes

Which property of qubits allows for the possibility of quantum parallelism?

a) Entanglement

b) Coherence

c) Decoherence

d) Measurement

Which quantum gate is used to perform a controlled-phase shift?

a) Hadamard gate

b) Pauli-Z gate

c) CNOT gate

d) Toffoli gate

Which principle states that the act of measuring a qubit does not disturb its superposition?

a) Pauli exclusion principle

b) Heisenberg uncertainty principle

c) Measurement principle

d) No-cloning theorem

Which type of quantum error correction code is obtained by concatenating multiple smaller codes?

a) Stabilizer codes

b) Topological codes

c) Concatenated codes

d) Surface codes

a) Entanglement

b) Coherence

c) Decoherence

d) Measurement

Which quantum algorithm is used for solving problems with a yes/no answer with a single query?

a) Grover’s algorithm

b) Shor’s algorithm

c) Quantum Fourier transform

d) Deutsch-Jozsa algorithm

Which principle states that it is impossible to simultaneously know the precise values of complementary variables of a quantum system?

a) Pauli exclusion principle

b) Heisenberg uncertainty principle

c) Measurement principle

d) No-cloning theorem

a) Entanglement

b) Coherence

c) Decoherence

d) Measurement

Which quantum gate is used to perform a controlled-Hadamard operation?

a) Hadamard gate

b) Pauli-X gate

c) CNOT gate

d) Toffoli gate

Which principle states that the act of measuring a qubit collapses its superposition into a definite state?

a) Pauli exclusion principle

b) Heisenberg uncertainty principle

c) Measurement principle

d) No-cloning theorem

Which type of quantum error correction code is used to protect qubits from arbitrary errors?

a) Stabilizer codes

b) Topological codes

c) Concatenated codes

d) Surface codes

a) Entanglement

b) Coherence

c) Decoherence

d) Measurement

Which quantum gate is used to create superposition?

a) Hadamard gate

b) Pauli-X gate

c) CNOT gate

d) Toffoli gate

a) Entanglement

b) Coherence

c) Decoherence

d) Measurement

Which quantum algorithm is used for searching an unsorted database with a quadratic speedup?

a) Grover’s algorithm

b) Shor’s algorithm

c) Quantum Fourier transform

d) Deutsch-Jozsa algorithm

Which principle states that the more precisely the position of a particle is known, the less precisely its momentum can be known?

a) Pauli exclusion principle

b) Heisenberg uncertainty principle

c) Measurement principle

d) No-cloning theorem

Which property of qubits is susceptible to environmental disturbances and leads to loss of quantum coherence?

a) Entanglement

b) Coherence

c) Decoherence

d) Measurement

Which type of quantum gate is used to perform controlled-NOT operations?

a) Hadamard gate

b) Pauli-X gate

c) CNOT gate

d) Toffoli gate

Which principle states that the state of a quantum system remains constant during the unitary evolution?

a) Pauli exclusion principle

b) Heisenberg uncertainty principle

c) Measurement principle

d) Schrödinger’s equation

Which type of quantum error correction code is based on non-Abelian anyons?

a) Stabilizer codes

b) Topological codes

c) Concatenated codes

d) Surface codes

Which property of qubits allows for the possibility of quantum parallelism?

a) Entanglement

b) Coherence

c) Decoherence

d) Measurement

Which quantum gate is used to perform a controlled-phase shift?

a) Hadamard gate

b) Pauli-Z gate

c) CNOT gate

d) Toffoli gate

Which principle states that the act of measuring a qubit does not disturb its superposition?

a) Pauli exclusion principle

b) Heisenberg uncertainty principle

c) Measurement principle

d) No-cloning theorem

Which type of quantum error correction code is obtained by concatenating multiple smaller codes?

a) Stabilizer codes

b) Topological codes

c) Concatenated codes

d) Surface codes

a) Entanglement

b) Coherence

c) Decoherence

d) Measurement

Which quantum algorithm is used for solving problems with a yes/no answer with a single query?

a) Grover’s algorithm

b) Shor’s algorithm

c) Quantum Fourier transform

d) Deutsch-Jozsa algorithm

Which principle states that it is impossible to simultaneously know the precise values of complementary variables of a quantum system?

a) Pauli exclusion principle

b) Heisenberg uncertainty principle

c) Measurement principle

d) No-cloning theorem

a) Entanglement

b) Coherence

c) Decoherence

d) Measurement

Which quantum gate is used to perform a controlled-Hadamard operation?

a) Hadamard gate

b) Pauli-X gate

c) CNOT gate

d) Toffoli gate