(The Gist of PIB) Quantum State Interferography

(THE GIST OF PIB) Quantum State Interferography

Scientists from Raman Research Institute (RRI), an autonomous institute under the Department of Science and Technology, have found a new way of inferring the state of a system (both two-dimensional qubits as well as higher-dimensional “qubits”) from an interference pattern, which they term ‘Quantum State Interferography’.

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A qubit is a 2-dimensional quantum system and requires usually 2 complex numbers to be determined towards state estimation.
Scientists are experimenting with new ways to manipulate quantum states so that they can be harnessed for computing, communication, and metrology.
This method of characterisation called Quantum State Interferography, can help make such manipulations simpler so that several crucial operations in quantum technologies become less cumbersome.
The setup requires only two interferometers from which many interferograms can be obtained to reconstruct the state.
This provides a ‘black box’ approach to quantum state estimation -- between the incidence of the photon and extraction of state information, conditions within the set-up are not changed, thus providing a true single-shot estimation of the quantum state.