Nonclassical properties of a contradirectional nonlinear optical coupler

Raman process is used for generation of nonclassical states and subsequent applications due to its simplicity. In view of the experimental feasibility of the off-resonant Raman process at single photon level useful in long distance quantum communication and quantum memory, we perform here a detailed study of possibility of generation of nonclassical states under off-resonance conditions. Specifically, we have studied nonclassicality in the off-resonant Raman process with the help of a characteristic function written using more general solution than the conventional short-time solution under complete quantum treatment and established the significance of frequency detuning parameter in generation of nonclassical states. The obtained characteristic function remains Gaussian and reveals that larger values of frequency detuning parameters are favorable to induce nonclassicality in some cases. The single-and two-mode squeezing and antibunching as well as intermodal entanglement are reported in terms of experimentally accessible quantum noise fluctuations considering either phonon mode coherent or chaotic. Subsequently, the joint photon number and integrated intensity distributions are studied to analyze the performance of pair generation in Stokes-phonon and pump-phonon modes. The present study discusses the role of resonance conditions in generation of nonclassical states and establishes that experimentally controllable detuning parameter can be used to probe and enhance the generated nonclassicality. arXiv:1812.08264v1 [quant-ph]

show abstract

“…The solutions reported in Eqs. (4) and (16), which are obtained with the help of Eq. (2), contain different functions defined as follows…”

Section: Appendix A: Terms In the Solutionmentioning

confidence: 99%

Nonclassicality in off-resonant Raman process

Thapliyal

Peřina

2019

Physics Letters A

Self Cite

View full text Add to dashboard Cite

show abstract

“…Recently, antibunching has been reported theoretically in [146,147,148] and experimentally in [115,149,150,151,152]. Thus, this particular type of nonclassical light seems to be easily achievable in many physical systems and have interesting applications in various domains of physics.…”

Section: Antibunched State and Its Applicationsmentioning

confidence: 99%

Classical light vs. nonclassical light: characterizations and interesting applications

Pathak

Ghatak

2017

Journal of Electromagnetic Waves and Applications

Self Cite

View full text Add to dashboard Cite

We briefly review the ideas that have shaped modern optics and have led to various applications of light ranging from spectroscopy to astrophysics, and street lights to quantum communication. The review is primarily focused on the modern applications of classical light and nonclassical light. Specific attention has been given to the applications of squeezed, antibunched, and entangled states of radiation field. Applications of Fock states (especially single photon states) in the field of quantum communication are also discussed. *

show abstract

“…To investigate the existence of quantum Zeno and anti-Zeno effects in the optical coupler of our interest, we have obtained closed form analytic expressions for the spatial evolu-tion of the different field operators using the Sen-Mandal perturbative approach [8,9,32], which is known to produce better results compared to the usual short-length approximation method [33]. Actually, in sharp contrast to the short length approximated solutions, the solutions of Heisenberg's equations of motion obtained using the Sen-Mandal approach are not restricted by length.…”

Section: Introductionmentioning

confidence: 99%

Linear and nonlinear quantum Zeno and anti-Zeno effects in a nonlinear optical coupler

2016

Self Cite

View full text Add to dashboard Cite

Quantum Zeno and anti-Zeno effects are studied in a symmetric nonlinear optical coupler, which is composed of two nonlinear (χ (2) ) waveguides that are interacting with each other via the evanescent waves. Both the waveguides operate under second harmonic generation. However, to study quantum Zeno and anti-Zeno effects one of them is considered as the system and the other one is considered as the probe. Considering all the fields involved as weak, a completely quantum mechanical description is provided, and the analytic solutions of Heisenberg's equations of motion for all the field modes are obtained using a perturbative technique. Photon number statistics of the second harmonic mode of the system is shown to depend on the presence of the probe, and this dependence is considered as quantum Zeno and anti-Zeno effects. Further, it is established that as a special case of the momentum operator for χ (2) − χ (2) symmetric coupler we can obtain momentum operator of χ (2) − χ (1) asymmetric coupler with linear (χ (1) ) waveguide as the probe, and in such a particular case, the expressions obtained for Zeno and anti-Zeno effects with nonlinear probe (which we referred to as nonlinear quantum Zeno and anti-Zeno effects) may be reduced to the corresponding expressions with linear probe (which we referred to as the linear quantum Zeno and anti-Zeno effects). Linear and nonlinear quantum Zeno and anti-Zeno effects are rigorously investigated, and it is established that in the stimulated case, we may switch between quantum Zeno and anti-Zeno effects just by controlling the phase of the second harmonic mode of the system or probe.

show abstract

Nonclassical properties of a contradirectional nonlinear optical coupler

Cited by 33 publications

References 72 publications

Nonclassicality in off-resonant Raman process

Nonclassicality in off-resonant Raman process

Classical light vs. nonclassical light: characterizations and interesting applications

Linear and nonlinear quantum Zeno and anti-Zeno effects in a nonlinear optical coupler

Contact Info

Product

Resources

About