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A note on Majorana representation of quantum states

  • Chi-Kwong Li,
  • Mikio Nakahara

摘要

By the Majorana representation, for any \(d > 1\) d > 1 there is a one-one correspondence between a quantum state of dimension d and \(d-1\) d - 1 qubits represented as \(d-1\) d - 1 points in the Bloch sphere. Using the theory of symmetry class of tensors, we present a simple scheme for constructing \(d-1\) d - 1 points on the Bloch sphere and the corresponding \(d-1\) d - 1 qubits representing a d-dimensional quantum state. Additionally, we demonstrate how the inner product of two d-dimensional quantum states can be expressed as a permanent of a matrix related to their \((d-1)\) ( d - 1 ) -qubit state representations. Extension of the result to mixed states is also considered.