Experimental Generation of Multiple Quantum Correlated Beams from Hot Rubidium Vapor

Qin, Zhongzhong; Cao, Leiming; Wang, Hailong; Marino, Alberto M.; Zhang, Weiping; Jing, Jietai

doi:10.1103/physrevlett.113.023602

Cited by 168 publications

(106 citation statements)

References 33 publications

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“…For instance, Refs. [19,20] detail the production of squeezed states from four-wave mixing in a hot rubidium vapour. The squeezed states produced in this vapor display a non-uniform squeezing distribution, which is ideally suited for application of our method.…”

Section: Discussionmentioning

confidence: 99%

Optimization of networks for measurement-based quantum computation

et al. 2015

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In this work we provide a recipe for mitigating the effects of finite squeezing, which affect the production of cluster states and the result of a measurement based quantum computation in the continuous variable regime. To this aim, we derive a compact expression for the unitary matrix which describes the linear optics network that generates a certain cluster state from independently squeezed inputs. We show that this possesses tunable degrees of freedom, which can be exploited to minimize the noise effects. These strategies are readily implementable by several experimental groups.

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Section: Discussionmentioning

confidence: 99%

Optimization of networks for measurement-based quantum computation

et al. 2015

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“…This can be accomplished by either splitting pump and probe fields and using multiple spaces in the same vapor cell, or by cascading multiple vapor cells. The latter option has an added advantage in that it will allow for cascaded gain regions which can lead to increased squeezing [29]. Its similarity with Fig.…”

Section: Experimental Implementationmentioning

confidence: 89%

Continuous-variable cluster-state generation over the optical spatial mode comb

Pooser

Jing

2014

Phys. Rev. A

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One way quantum computing uses single qubit projective measurements performed on a cluster state (a highly entangled state of multiple qubits) in order to enact quantum gates. The model is promising due to its potential scalability; the cluster state may be produced at the beginning of the computation and operated on over time. Continuous variables (CV) offer another potential benefit in the form of deterministic entanglement generation. This determinism can lead to robust cluster states and scalable quantum computation. Recent demonstrations of CV cluster states have made great strides on the path to scalability utilizing either time or frequency multiplexing in optical parametric oscillators (OPO) both above and below threshold. The techniques relied on a combination of entangling operators and beam splitter transformations. Here we show that an analogous transformation exists for amplifiers with Gaussian inputs states operating on multiple spatial modes. By judicious selection of local oscillators (LOs), the spatial mode distribution is analogous to the optical frequency comb consisting of axial modes in an OPO cavity. We outline an experimental system that generates cluster states across the spatial frequency comb which can also scale the amount of quantum noise reduction to potentially larger than in other systems.

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“…However, it is impossible to generate lights with quantum correlation at different frequencies. Other proposals, such as cascaded nonlinearities, also have this shortcoming [14,15], Recently, it was also demonstrated that a standard triply "zhang® ee.uec.ac.jp PACS number(s): 42.50.Dv, 42.25.-p , 03.67.Ddresonant above-threshold OPO was able to directly produce pump-signal-idler tripartite quantum entanglement in both theory and experiment [16,17]. Its significant advantage is that is able to generate quantum correlations at different frequencies.…”

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confidence: 99%

Generation of tripartite quantum correlation among amplitude-squeezed beams by frequency doubling in a singly resonant cavity

Mitazaki

Kasai

et al. 2015

Phys. Rev. A

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We present a technique for generation of tripartite quantum-correlated amplitude-squeezed light beams, using frequency doubling in a singly resonant cavity with two output ports. The two-output second-harmonic (SH) beams are both nonlinearly coupled to the common fundamental beam even though they have no direct interaction. The nonlinear couphng produces noise reduction of amplitude for each beam and quantum correlations among three beams. In our first experiment, we measured amplitude squeezing of 0.5, 0.8, and 0.6 dB for the fundamental beam and two output SH beams, respectively. Meanwhile, quantum correlation of 0.6 dB between the two amplitude-squeezed SH beams and quantum anticorrelation of 0.6 and 0.8 dB between the squeezed fundamental beam and each of the SH beams were observed around the range of optimum conversion efficiency. This opens an alternate way to produce tripartite-quantum-correlated systems.Continuous wave light beams that exhibit nonclassical statistics and quantum correlation are of interest in studies of quantum mechanics and for a number of applications that include precision measurements beyond the shot-noise limit and quantum information such as quantum communications, quantum key distribution, and quantum teleportation [1-3]. As a matter of fact, the optical Einstein-Podolsky-Rosen entangled state, which is the essential quantum source for implementing continuous variable quantum information, is a two-mode entangled state consisting of two submodes with quantum correlations between both the quadrature amplitude and the quadrature phase [4], Generation and application of bipartite quantum entanglement have been extensively inves tigated both theoretically and experimentally [5][6][7][8][9]. With the development of quantum communication techniques, quantum correlation among more than two parties is going to be the key ingredient for advanced quantum network systems. Especially, the generation of lights with quantum correlation at different frequencies is more important since they are able to link quantum information between communication and storage in the nodes, in which atoms, trapped ions, or fiber windows are employed [10,11].A number of different techniques for the generation of quan tum correlations among multiple beams have been proposed and experimentally implemented. Each of the schemes has its advantages and disadvantages. For example, one of the approaches is to combine independent squeezed states, which are generated from optical parametric oscillators (OPOs), on beam splitters [12,13]. Owing to the availability of high-quality nonlinear material, it is easy to get high-level quantum correla tions. However, it is impossible to generate lights with quantum correlation at different frequencies. Other proposals, such as cascaded nonlinearities, also have this shortcoming [14,15], Recently, it was also demonstrated that a standard triply "zhang® ee.uec.ac.jp PACS number(s): 42.50.Dv, 42.25.-p , 03.67.Ddresonant above-threshold OPO was able to directly produce pump-signal-idler tr...

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Experimental Generation of Multiple Quantum Correlated Beams from Hot Rubidium Vapor

Cited by 168 publications

References 33 publications

Optimization of networks for measurement-based quantum computation

Optimization of networks for measurement-based quantum computation

Continuous-variable cluster-state generation over the optical spatial mode comb

Generation of tripartite quantum correlation among amplitude-squeezed beams by frequency doubling in a singly resonant cavity

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