Quantum Computing Interview Questions and Answers – Set 1

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This is the first in series of practice tests / interview questions and answers in relation to Quantum computing. It touches upon the basic concepts in relation to some of the following:

  • Qubit
  • Difference between a bit and Qubit
  • Superposition of Qubit states
  • Quantum entanglement

This practice test will prove to be useful for Quantum Computing beginners / interns / freshers. 


Revision Notes – Quantum Computing Fundamentals

  • Quantum computing is different than classical computing. Problems which are suited for quantum computing should be considered for Quantum computing.
  • A Qubit is a two-state quantum mechanical system;
  • A Qubit can be in superposition of both the states at the same time.
  • A Qubit is similar to bit in the way that the measurement of Qubit has two possible outcomes, usually 0 and 1
  • A Qubit is different than bit in the way that a Qubit can be in a state which is a superposition of both 0 and 1
  • The two states in which a qubit may be measured are known as basis states (basis vectors)
  • In quantum mechanics, the Bloch sphere is a geometrical representation of the pure state space of a 2-level quantum system. The Bloch sphere is actually, geometrically, spherical in shape.
  • A Quantum logic gate can operate on a Qubit.
  • 8 Qubits = 1 Qubyte (Quantum Byte)
  • A Qubit can be measured with quantum register
  • A Qubit is different than bit due to following reasons:
    • It can have superposition of states, e.g., can be in both states (usually 0 and 1) at the same time.
    • Can be entangled with other Qubit
  • In case of 2-qubit system, it is not possible to determine state of individual qubit in the system as the states of the two qubits are entangled



Practice Test – Quantum Computing Fundamentals

Quantum computing is _________ than classical computing

A Qubit is a _________ quantum mechanical system.

A Qubit can be in __________ of both the states at the same time

Unlike a bit, the measurement of Qubit can have more than two possible outcomes

Unlike a bit, the Qubit can be in both 0 and 1 state (superposition of both 0 and 1 states)

The two states in which a qubit may be measured are known as ________

Which of the following shape can be used to the pure state space of a 2-level quantum system?

Which of the following can operate on a Qubit?

8 _______ is to 1 ______ as 8 _______ is to 1 ________

The amount of information stored in N Qubits is ________ to the power of N classical bits

A Qubit can be used to represent any ________ system

A Qubit can be measured with __________ register.

Which of the following makes Qubit different than a classical bit?

In case of 2-qubit system, it is possible to determine state of individual qubit in the system.



References

Ajitesh Kumar

Ajitesh Kumar

Ajitesh is passionate about various different technologies including programming languages such as Java/JEE, Javascript, PHP, C/C++, mobile programming languages etc, and, computing fundamentals related with cloud-native technologies, application security, cloud computing platforms, mobile apps, big data etc.

He has also authored the book, Building Web Apps with Spring 5 and Angular.
Ajitesh Kumar

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