mirror of https://github.com/Qiskit/qiskit.git
20 lines
796 B
YAML
20 lines
796 B
YAML
---
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features:
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- |
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A new class :class:`~qiskit.circuit.library.PhaseEstimation` has been
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added to :mod:`qiskit.circuit.library`. This circuit library class is
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the circuit used in the original formulation of the phase estimation
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algorithm in
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`arXiv:quant-ph/9511026 <https://arxiv.org/pdf/quant-ph/9511026.pdf>`__.
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Phase estimation is the task to to estimate the phase :math:`\phi` of an
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eigenvalue :math:`e^{2\pi i\phi}` of a unitary operator :math:`U`, provided
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with the corresponding eigenstate :math:`|psi\rangle`. That is
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.. math::
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U|\psi\rangle = e^{2\pi i\phi} |\psi\rangle
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This estimation (and thereby this circuit) is a central routine to several
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well-known algorithms, such as Shor's algorithm or Quantum Amplitude
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Estimation.
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