Scalable scheme for entangling multiple ququarts using linear optical elements

Baek, So Young; Kim, Yoon Ho

doi:10.1016/j.physleta.2007.05.033

Cited by 5 publications

(7 citation statements)

References 29 publications

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“…Especially, the ququart based on the biphoton polarization state of frequency-nondegenerate spontaneous parametric down-conversion (SPDC) exhibits a few properties which are important for applications in quantum information research: First, all the ququart basis states can be accessed using only linear optical elements (phase plates) [20,21]. Second, it is possible to prepare a multiququart entangled state starting from multiple individual biphoton ququarts, linear optical elements (beam splitters), and post-selection measurement [22,23]. So far, only pure state biphoton ququarts have been demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of arbitrary states of four-dimensional qudits based on biphotons

et al. 2008

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We report interferometric schemes to prepare arbitrary states of four-dimensional qudits ͑ququarts͒ based on biphoton states of ultrafast-pumped frequency-nondegenerate spontaneous parametric down conversion. Preparation and tomographic characterization of a few examples of general single-ququart states, a pure state, a mixed state ͑fully diagonal͒, and a mixed state ͑partially coherent͒, are experimentally demonstrated.

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Section: Introductionmentioning

confidence: 99%

Preparation and characterization of arbitrary states of four-dimensional qudits based on biphotons

et al. 2008

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“…The entanglement generation * oskwon98@gmail.com schemes utilizing the intrinsic correlation nature of photon pairs, however, cannot be considered as such processes. Note that there have been some theoretical studies to realize the scalable entanglement generation of qudits [24,25]. In Refs.…”

Section: Introductionmentioning

confidence: 99%

“…In Refs. [24,25], the authors explicitly analyzed the generation of entanglement of four-dimensional qudits or ququarts. Each ququart is prepared with the polarization and spectral modes of a biphoton.…”

Section: Introductionmentioning

confidence: 99%

Entangling two separate photonic ququarts using linear optical elements

Kwon

Lim

et al. 2014

Phys. Rev. A

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“…To answer this question, we have investigated three different choices of beam splitters (a 50-50 beam splitter, a polarizing beam splitter, and a dichroic beam splitter) for the ideal biphoton state as well as the SPDC biphoton state as the input to the beam splitter [4,5].…”

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confidence: 99%

“…In addition, it is also possible to scale up this scheme to entangle multiple biphoton ququarts [5].…”

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confidence: 99%

Biphoton ququarts and their entanglement

Kim

2007

2007 Conference on Lasers and Electro-Optics - Pacific Rim

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A four-dimensional quantum system (ququart) can be constructed by using the biphoton polarization states of frequency-nondegenerate spontaneous parametric down-conversion. We first discuss how to generate and characterize general single-ququart states with varying degrees of mixedness. We then discuss schemes to entangle multiple biphoton ququarts using linear optics and coincidence postselection.Two-dimensional quantum states and their entanglement (i.e., qubits and entangled qubits) have long been important in quantum information research. Recently, higher-dimensional quantum states and their entanglement (i.e., quDits and entangled quDits) have been found to be important for better understanding the nature of quantum entanglement and in several areas of quantum information research.In experiment, any two-dimensional degree of freedom of a photon can be utilized to implement a qubit although the polarization state is most often utilized due to the easy control and manipulation than any other two-dimensional photonic degrees of freedom. To implement photonic quDits, high-dimensionality provided by photonic orbital angular momentum, spatial paths, etc., are often utilized as the polarization state only provides a two-dimensional degree of freedom. But these multi-dimensional photonic degrees of freedoms are very difficulty to control and entangling schemes for individual quDits do not exist. (It is however possible to generate entangled pairs using the energy-time and position-momentum entanglement of the spontaneous parametric down-conversion photon pair.)Recently, a scheme to generate a pure four-dimensional quantum state (ququart), using the polarization state of an entangled photon pair of frequency-nondegenerate spontaneous parametric down-conversion, was reported [1,2]. This biphoton ququart scheme is quite promising for applications in quantum information since it is possible to access and switch among all four bases states linear optically [3].In this paper, we first discuss how to generate and characterize general biphoton ququart states with varying degrees of mixedness using ultrafast spontaneous parametric down-conversion. We then discuss entangling schemes for individually prepared multiple biphoton ququarts using linear optical elements and coincidence postselection.

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Scalable scheme for entangling multiple ququarts using linear optical elements

Cited by 5 publications

References 29 publications

Preparation and characterization of arbitrary states of four-dimensional qudits based on biphotons

Preparation and characterization of arbitrary states of four-dimensional qudits based on biphotons

Entangling two separate photonic ququarts using linear optical elements

Biphoton ququarts and their entanglement

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