Generating photon-added states without adding a photon

Shringarpure, S. U.; Franson, J. D.

doi:10.1103/physreva.100.043802

Cited by 14 publications

(13 citation statements)

References 31 publications

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“…These states show rich nonclassical properties and exhibit quadrature squeezing for a wide range of α values [29]. Experimental generation of the single photon-added coherent state has been achieved [38,39], and there exist schemes for the generation of higher-order photon-added coherent states [40,41]. Recently the PACS using the continuous mode formalism was developed, and due to its squeezed nature, these states offer an advantage in quantum sensing applications [42].…”

Section: Superposition Of Squeezed States and Its Squeezingmentioning

confidence: 99%

Disappearance of squeezing in superposition states and its manifestation in the energy density

Kannan¹,

Sudheesh²

2022

J. Phys. B: At. Mol. Opt. Phys.

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We have classified the superposition of squeezed wavepackets into two kinds and studied their quadrature squeezing. We have shown that the squeezing and higher-order squeezing in the quadrature disappear for the states of the first kind. However, for the second kind, it is possible to achieve the maximum amount of squeezing by adjusting the parameters in the superposition. The absence of squeezing for the superposition states is explained based on the expectation value of the energy density. We find that the expectation value of energy density in quantum wavepackets that shows no squeezing is positive. The energy density in the decoherence dynamics of single and two-mode squeezed states is also carried out. Our further analysis shows that different types of squeezed states, including states which are not wavepackets, exhibit negative energy density.

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Section: Superposition Of Squeezed States and Its Squeezingmentioning

confidence: 99%

Disappearance of squeezing in superposition states and its manifestation in the energy density

Kannan¹,

Sudheesh²

2022

J. Phys. B: At. Mol. Opt. Phys.

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“…These states show rich nonclassical properties and exhibit quadrature squeezing for a wide range of α values [26]. Experimental generation of the single photon-added coherent state has been achieved [35], and there also exists schemes for the generation of higher-order photonadded coherent states [36,37]. Consider the l superposition of the first kind of m-PACS:…”

Section: Squeezed Vacuum Statementioning

confidence: 99%

Positive energy density leads to no squeezing

Kannan¹,

Sudheesh²

2021

Preprint

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We consider two kinds of superpositions of squeezed states of light. In the case of superpositions of first kind, the squeezing and all higher order squeezing vanishes. However, in the case of the second kind, it is possible to achieve a maximum amount of squeezing by adjusting the parameters in the superposition. The emergence and vanishing of squeezing for the superposition states are explained on the basis of expectation values of the energy density. We show that expectation values of energy density of quantum states which show no squeezing will be always positive and that of squeezed states will be negative for some values of spacetime-dependent phase.

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“…Recently, Ye et al proposed an alternative scheme of multiphoton catalysis, in which the beam splitter is replaced with an OPA [45,46]. A similar scheme was proposed in [47]. As shown in figure 2, when the same Fock state |m⟩ is detected by the PNRD at the lower-right port of the OPA, an m-photon catalyzed state |ψ⟩ out is then generated conditionally at the upper-right port.…”

Section: Multiphoton Catalysis Using An Opamentioning

confidence: 99%

Enhancing quantum entanglement of the two-mode squeezed vacuum state via multiphoton catalysis

Yang

2020

Laser Phys. Lett.

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Multiphoton catalysis is a non-Gaussian operation which has aroused interest recently in quantum information processing. There are two schemes of multiphoton catalysis in the current literature: one uses a beam splitter, while the other uses an optical parametric amplifier. We derive the catalysis operator in the Fock basis for each scheme and find a close relationship between them. We propose to enhance quantum entanglement of the two-mode squeezed vacuum state by performing two-mode multiphoton catalysis independently using two beam splitters. We calculate the optimal entanglement, which is maximized over two independent transmissivities, for the catalyzed states with various pairs of catalysis photon numbers, and find that in each case entanglement is enhanced only when the squeezing parameter is below a certain threshold. We also find that the optimal entanglement is nonzero in the limit of low squeezing, and deduce the analytical forms of the limiting catalyzed state and its entanglement in each case from numerical coefficients.

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Generating photon-added states without adding a photon

Cited by 14 publications

References 31 publications

Disappearance of squeezing in superposition states and its manifestation in the energy density

Disappearance of squeezing in superposition states and its manifestation in the energy density

Positive energy density leads to no squeezing

Enhancing quantum entanglement of the two-mode squeezed vacuum state via multiphoton catalysis

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