Innovations in Sciences, IT, Computers, Robotics and Nanotechnology

[pib] Quantum coin or ‘qubit’ and Entanglement Theory


From UPSC perspective, the following things are important :

Prelims level : Qubit, Quantum Entanglement

Mains level : Quantum Computing and its applications

Researchers from Raman Research Institute (RRI), an autonomous institution under the Dept. of Science & Technology, have devised a new test for fairness of quantum coin or ‘qubit’ using entanglement theory. The Qubit is the basic unit of information in a quantum computer.

Entanglement Theory

  • It is a special type of correlation that exists in the quantum world with no classical counterpart.
  • The researchers from RRI made use of this quantum resource to arrive at a test for fairness of a quantum coin (a qubit).
  • Their strategy, which makes use of entanglement, enables better discrimination between quantum states. Such advantage is valuable in quantum sensors.
  • This work is a significant contribution to the domain of quantum state discrimination, which is an essential aspect of quantum information science.
  • It brings out the crucial role of entanglement in improving our ability to discriminate quantum states.
  • In this work the researchers concretely implemented the theoretical idea on the simulation facility of the IBM quantum computer.

Quantum coins

  • By repeated trials, one can determine the fairness of a classical coin with a confidence which grows with the number of trials.
  • A quantum coin can be in a superposition of heads and tails.
  • Given a string of qubits representing a series of trials, one can measure them individually and determine the state with a certain confidence.
  • The team has shown that there is an improved strategy which measures the qubits after entangling them, which leads to a greater confidence.


  • This is a significant contribution to quantum state discrimination, an essential aspect of quantum information science which is expected to influence quantum sensing.
  • The domain of Quantum Information and Quantum Computing Technology is a growing area of research which is expected to influence Data Processing, which in turn, plays a central role in our lives in this Information Age.
  • For instance, bank transactions, online shopping and so on crucially depend on the efficiency of information transfer.
  • Thus the recent work on quantum state discrimination is expected to be valuable in people’s lives in the current era.

Inline Feedbacks
View all comments


Join us across Social Media platforms.