Journal
PHYSICAL REVIEW A
Volume 106, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.106.043721
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Funding
- National Natural Science Founda-tion of China
- Scientific Research Fund of Hunan Provincial Education Department
- [11935012]
- [11947069]
- [20C0495]
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The article proposes an all-optical scheme for deterministically preparing squeezed Schrödinger-cat states with high speed and applicability to other physical platforms. It shows that control of driving fields can accelerate the generation of squeezed Schrödinger-cat states and allows for accurate phase estimation in optical interferometers.
Quantum states are important resources and their preparations are essential prerequisites to all quantum tech-nologies. However, they are extremely fragile due to the inevitable dissipations. Here the all-optical generation of a deterministic squeezed Schrodinger-cat state based on dissipation is proposed. Our system is based on the Fredkin-type interaction between three optical modes, one of which is subject to coherent two-photon driving and the others are coherent driving. We show that an effective degenerate three-wave-mixing process can be engineered in our system, which can cause the simultaneous loss of two photons, resulting in the generation of a deterministic squeezed Schrodinger-cat state. More importantly, by controlling the driving fields in our system, the two-photon loss can be adjustable, which can accelerate the generation of squeezed Schrodinger-cat states. In addition, we exploit the squeezed Schrodinger-cat states to estimate the phase in the optical interferometer and show that the quantum Fisher information about the phase can reach the Heisenberg limit in the limit of a large photon number. Meanwhile, it can have an order of magnitude factor improvement over the Heisenberg limit in the low-photon-number regime, which is very valuable for fragile systems that cannot withstand large photon fluxes. This work proposes an all-optical scheme to deterministically prepare the squeezed Schrodinger-cat state with high speed and can also be generalized to other physical platforms.
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