A squeezed coherent state is a quantum state of light that exhibits properties of both coherent states and squeezed states. To understand these concepts, let's break them down: 1. **Coherent States**: Coherent states \( |\alpha\rangle \) are specific quantum states of the electromagnetic field that closely resemble classical light. They are characterized by a well-defined phase and amplitude, represented by the complex parameter \(\alpha\).
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A squeezed coherent state is obtained from the vacuum by a squeeze operator and a displacement operator. Its quadrature variances can differ while saturating the uncertainty product. With zero displacement it is a squeezed vacuum state.
