Experimental Realization and Characterization of Stabilized Pair-Coherent States

Gertler, Jeffrey; Geldern, Sean van; Shirol, Shruti; Jiang, Liang; Wang, Chen

doi:10.1103/prxquantum.4.020319

Cited by 8 publications

(1 citation statement)

References 53 publications

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“…It is important to highlight that these PCSs constitute non-Gaussian entangled states. These states have been experimentally generated (in local space) in laboratories to facilitate the implementation of various quantum tasks [42]. Implementing the conditional measurement operation on both a and b modes of the PCSs, the reduced setup to generate the PCSCMs is depicted in figure 2.…”

Section: Conditional Measurement Via Bss and The Pcscmsmentioning

confidence: 99%

Enhancing quantum features and teleportation fidelity of two-mode non-Gaussian states using conditional measurements

Truong,

Tran

2024

Laser Phys. Lett.

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The family of two-mode non-Gaussian entangled states, including the pair coherent states (PCSs) and their genealogies, has been extensively investigated regarding their quantum properties and their practical applications in quantum information. Specifically, certain states, such as the multiphoton catalytic pair coherent states (MCPCSs), have been newly introduced under specific experimental conditions. For a more feasible approach, in this paper, we introduce novel nonclassical states obtained by subtracting photons through conditional measurements using beam splitters applied to the two modes of the PCSs. These states are called pair coherent states with conditional measurements (PCSCMs). Our purpose is to demonstrate that the quantum features, such as entanglement, Einstein–Podolsky–Rosen (EPR) correlation, EPR steering, and the average fidelity in teleportation can be enhanced in comparison with both the original PCSs and the MCPCSs. In specific cases, several characteristics are observed in PCSCMs but not inspected in both PCSs and MCPCSs. In our findings, we prove that the quantum characteristics within the PCSCMs are influenced not just by the number of detected photons, denoted by variables k and l, but also by the discrepancy in photon numbers, especially by the difference of k − l.

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Section: Conditional Measurement Via Bss and The Pcscmsmentioning

confidence: 99%

Enhancing quantum features and teleportation fidelity of two-mode non-Gaussian states using conditional measurements

Truong,

Tran

2024

Laser Phys. Lett.

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Shaping photons: Quantum information processing with bosonic cQED

Copetudo,

Fontaine,

Valadares

et al. 2024

Applied Physics Letters

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With its rich dynamics, the quantum harmonic oscillator is an innate platform for understanding real-world quantum systems and could even excel as the heart of a quantum computer. A particularly promising and rapidly advancing platform that harnesses quantum harmonic oscillators for information processing is the bosonic circuit quantum electrodynamics (cQED) system. In this article, we provide perspectives on the progress, challenges, and future directions in building a bosonic cQED quantum computer. We describe the main hardware building blocks and how they facilitate quantum error correction, metrology, and simulation. We conclude with our views of the key challenges that lie on the horizon, as well as scientific and cultural strategies for overcoming them and building a practical quantum computer with bosonic cQED hardware.

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Improved experimental scheme for the generation of pair coherent state in traveling-wave optical fields

Truong,

Tran,

2024

Laser Phys. Lett.

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Pair coherent state (PCS) is a two-mode non-Gaussian state recently generated within spatially confined superconducting cavities. Under typical conditions, it is unsuitable for performing global quantum missions in open space. Several methods have been proposed to generate this state with the capability to propagate unrestrictedly. However, these methods employed an excessive amount of unnecessary physical resources or relied on coherent displacement within the low regime. This paper presents a novel experimental approach to generate this state, specifically designed for facilitating long-distance quantum information processing and communication tasks. The method involves the utilization of two weak cross-Kerr nonlinear media, two balanced beam splitters, and an on/off photodetector. Furthermore, the input comprises three CSs with high amplitudes. These physical resources are potentially accessible within existing technology. The analysis of success probability and fidelity demonstrates that the PCS can be successfully generated with a high coherent parameter amplitude, even in scenarios where the photodetector efficiency is low, provided that the coherent amplitudes are sufficiently high.

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Experimental Realization and Characterization of Stabilized Pair-Coherent States

Cited by 8 publications

References 53 publications

Enhancing quantum features and teleportation fidelity of two-mode non-Gaussian states using conditional measurements

Enhancing quantum features and teleportation fidelity of two-mode non-Gaussian states using conditional measurements

Shaping photons: Quantum information processing with bosonic cQED

Improved experimental scheme for the generation of pair coherent state in traveling-wave optical fields

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