Experimental demonstration of robustness of Gaussian quantum coherence

Kang, Haijun; Dong-mei, Han; Wang, Na; Yang, Liu; Hao, Shuhong; Su, Xiaolong

doi:10.1364/prj.424198

Cited by 15 publications

(13 citation statements)

References 59 publications

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“…√ 2 of signal mode â1 and idler mode â2 from the output of the NOPA are correlated with each other, where the variance of amplitude sum V[ X1 + X2 ] = e −2r and phase difference V[ P1 − P2 ] = e −2r are lower than vacuum noise if the squeezing parameter r is larger than zero. [39][40][41][42] By coupling those two modes on a beam splitter, the coupled modes are expressed by…”

Section: The Principlementioning

confidence: 99%

Simultaneous Preparation of Two Optical Cat States Based on a Nondegenerate Optical Parametric Amplifier

Dong-mei

Wang

et al. 2023

Annalen der Physik

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The cat state, known as the superposition of coherent states, has broad applications in quantum computation and quantum metrology. Increasing the number of optical cat states is crucial to implement complex quantum information tasks based on them. Here, two optical cat states are prepared simultaneously based on a nondegenerate optical parametric amplifier. By subtracting one photon from each of two squeezed vacuum states, two odd cat states with orthogonal superposition direction in phase space are prepared simultaneously, which have similar fidelity of 60% and amplitude of 1.2. Compared with the traditional method to generate two odd optical cat states based on two degenerate optical parametric amplifiers, only one nondegenerate optical parametric amplifier is applied in this experiment, which saves half of the quantum resources of nonlinear cavities. The presented results make a step toward preparing the four‐component cat state, which has potential applications in fault‐tolerant quantum computation.

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Section: The Principlementioning

confidence: 99%

Simultaneous Preparation of Two Optical Cat States Based on a Nondegenerate Optical Parametric Amplifier

Dong-mei

Wang

et al. 2023

Annalen der Physik

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“…As a result, the system may lose its quantum properties partially or completely (known as sudden death), rendering it unusable for quantum information tasks. Up to now, the effects of decoherence channels on entanglement [39][40][41] , Bell nonlocality 42,43 , coherence 44,45 and discord 46,47 have…”

Section: Dynamics Of Multipartite Quantum Steering For Different Type...mentioning

confidence: 99%

Dynamics of multipartite quantum steering for different types of decoherence channels

Xiao

Han

et al. 2023

Sci Rep

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Multipartite quantum steering, a unique resource for asymmetric quantum network information tasks, is very fragile to the inevitable decoherence, which makes it useless for practical purposes. It is thus of importance to understand how it decays in the presence of noise channels. We study the dynamic behaviors of genuine tripartite steering, reduced bipartite steering, and collective steering of a generalized three-qubit W state when only one qubit interacts independently with the amplitude damping channel (ADC), phase damping channel (PDC) or depolarizing channel (DC). Our results provide the region of decoherence strength and state parameters that each type of steering can survive. The results show that these steering correlations decay the slowest in PDC and some non-maximally entangled states more robust than the maximally entangled ones. Unlike entanglement and Bell nonlocality, the thresholds of decoherence strength that reduced bipartite steering and collective steering can survive depend on the steering direction. In addition, we find that not only one party can be steered by a group system, but also two parties can be steered by a single system. There is a trade-off between the monogamy relation involving one steered party and two steered parties. Our work provides comprehensive information about the effect of decoherence on multipartite quantum steering, which will help to realize quantum information processing tasks in the presence of noise environments.

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“…It is obvious that the Gaussian quantum correlation measure 𝑀 is obtained once we know the elements of the CM, which is much easier to calculate compared with the Gaussian quantum discord [6] . be reconstructed based on the measured data [17] . Then, we calculate the quantum correlation measure 𝑀.…”

Section: The Gaussian Quantum Correlation Measure 21 Theorymentioning

confidence: 99%

Experimental verification of the Gaussian quantum correlation measure in continuous variable systems

Zeng

Wang

Ding

et al. 2023

14th International Photonics and Optoelectronics Meetings (POEM 2022)

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The presence of quantum correlations in composite quantum systems is one of the main features of quantum mechanics. However, by now, all known quantifications of this correlation for continuous-variable systems are very difficult to compute. Therefore, it makes sense to find simpler and computable quantifications of Gaussian quantum correlations. Recently, a computable Gaussian quantum correlation M is proposed, which can be obtained based on the covariance matrix. Here, we experimentally demonstrate the Gaussian quantum correlation 𝑀 based on the two-mode entangled state carrying orbital angular momentum (OAM) generated from a four-wave mixing process in a hot Cesium atom vapor cell and investigate the evolution of such correlation in the lossy channel. Our results show that quantum correlation 𝑀 is robust in the lossy channel.

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Experimental demonstration of robustness of Gaussian quantum coherence

Cited by 15 publications

References 59 publications

Simultaneous Preparation of Two Optical Cat States Based on a Nondegenerate Optical Parametric Amplifier

Simultaneous Preparation of Two Optical Cat States Based on a Nondegenerate Optical Parametric Amplifier

Dynamics of multipartite quantum steering for different types of decoherence channels

Experimental verification of the Gaussian quantum correlation measure in continuous variable systems

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