# Questions tagged [squeezed-states]

Light with reduced quantum uncertainty: its electric field strength Ԑ for some phases ϑ has a quantum uncertainty smaller than that of a coherent state. Do not use for plain coherent states.

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### Can entanglement cause interaction in a non-interacting system? [closed]

For example, spins of atomic vapor are non-interacting, but they can be entangled by light. If we first use light to prepare these spins into an entangled state, and then let these spins evolve, can ...
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### Arbitrary first and second moment for squeezed spin coherent state

Consider a spin coherent state of $N$ spin-$1/2$ atoms polarized in the $+x$-direction, denoted $\lvert \frac{\pi}{2},0 \rangle$. Now, squeeze this state in the $+z$-direction with a one-axis twisting ...
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### Spin-squeezing parameter for the coherent spin state

Let us consider the following definition of the spin-squeezing parameter $$\xi^2 = 2 \frac{\left( \Delta S_{\vec{n}_1} \right)_{\min}^2}{\left| \langle \vec{S} \rangle \right|},$$ where the value in ...
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### Does squeezed light gravitate repulsively? [closed]

Since there are alternate regions of positive and negative energy densities in squeezed light, does that mean that the negative energy density parts gravitate repulsively? Since the stress energy ...
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### How does squeezed multimode light, where the modes are entangled, behave in a beamsplitter?

I understand how to work with and describe squeezed single modes going through a beamsplitter, and can conceptually talk about what's happening. If I now take a source of squeezed light that has ...
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### What is the state vector of a displaced (single-mode) squeezed vacuum state in the quadrature basis?

I've been hunting through the quantum optics literature for the displaced squeezed state written in the $q$-quadrature basis ($p$-quad would be fine too, since it's just a Fourier transform), but it ...
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### Mapping between quadrature squeezing and photon-number squeezing

It is possible to get quadrature squeezed light where on one quadrature the uncertainty is less than the of a coherent state while in the other one, orthogonal to it, it is larger. Is it possible, by ...
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### Is Fock state a squeezed state?

Is Fock state a squeezed state? I assume that 'yes', that is how it beats shot-noise limit the next question is that what is its complementary variable? Basically is delta N -> delta p what is its ...
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### Calculating the second-order correlation function for a 2-mode squeezed vacuum state

I am trying to calculate the second order correlation function $g^2(τ)$ at τ (delay) equal to zero, for a 2 modes squeezed vacuum state that is given by: According to the following paper https://www....
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### How to creat a squeezed-state light in integrated-photonic devices

I am interested in studying (squeezed-state light in integrated-photonic devices by means of four-wave mixing). I would like to be completely familiar with the working method and all the devices that ...
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### Phase modulation of beat notes between two large phase different source

I am working on the following experiment: I send a CW laser (whose path has a fiber stretcher can be modulated by a function generator to change fiber length periodically) and a Menlo source (...
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### Theoretical description of a two-mode squeezed state with continuous modes

Given two distinguishable modes $a$ and $b$ with $[a,a^\dagger]=1$ and $[b,b^\dagger]=1$ and $[a,b^\dagger]=0$, the two-mode squeezed vacuum state is given by \exp (\zeta^* a b - \...
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### two mode squeezed state in coherent state basis

It is known that, in the Fock basis, the two-mode squeezed state takes the form $$\vert TMSS \rangle = \sum_n \dfrac{(-e^{i\phi} \tanh(r))^n}{\cosh(r)} \vert n,n \rangle \;.$$ An other possibility ...
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### Interpreting Hamiltonian of single-mode squeezing

Hamiltonian represents energy. I can understand this when considering about harmonic oscillator, whose Hamiltonian is expressed as: $$\hat{H} = \frac{1}{2m}\hat{p}^2 + \frac{m\omega^2}{2}\hat{q}^2$$ ...
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