Experimental generation and characterization of single-photon hybrid ququarts based on polarization and orbital angular momentum encoding

Nagali, Eleonora; Sansoni, Linda; Marrucci, Lorenzo; Santamato, Enrico; Sciarrino, Fabio

doi:10.1103/physreva.81.052317

Cited by 78 publications

(67 citation statements)

References 51 publications

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“…HOM interference is a useful proof of principle because it is the basis of many other quantum operations, such as higher-dimensional entanglement, teleportation, quantum logic gates and boson-sampling1234151634. In the original HOM experiment, a path beamsplitter is used to combine two originally orthogonal paths of two single photons, making them indistinguishable.…”

Section: Resultsmentioning

confidence: 99%

Quantum interference between transverse spatial waveguide modes

et al. 2017

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Integrated quantum optics has the potential to markedly reduce the footprint and resource requirements of quantum information processing systems, but its practical implementation demands broader utilization of the available degrees of freedom within the optical field. To date, integrated photonic quantum systems have primarily relied on path encoding. However, in the classical regime, the transverse spatial modes of a multi-mode waveguide have been easily manipulated using the waveguide geometry to densely encode information. Here, we demonstrate quantum interference between the transverse spatial modes within a single multi-mode waveguide using quantum circuit-building blocks. This work shows that spatial modes can be controlled to an unprecedented level and have the potential to enable practical and robust quantum information processing.

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Section: Resultsmentioning

confidence: 99%

Quantum interference between transverse spatial waveguide modes

et al. 2017

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“…Light quantum states can be utilized for implementing qudits by exploiting various degrees of freedom of photons, such as polarization [37][38][39], orbital angular momentum (OAM) [40,41], path mode [42][43][44], time bin [45], or a combination of different degrees of freedom (see, e.g., [46,47]), and so on. Indeed, many optical realizations, manipulations, and applications of qudits and entangled qudits with the aforementioned degrees of freedom have been experimentally demonstrated [40,43,45,[47][48][49][50][51][52]. As to the experimental implementation of RIC for qudits, one mainly needs to consider three points as follows: (i) preparation of the entangled channel, i.e., preparing d-level Bell states (bipartite maximally entangled states) or GHZ states, or the unlockable bound entangled states of Eq.…”

Section: Discussionmentioning

confidence: 99%

Remote information concentration and multipartite entanglement in multilevel systems

et al. 2011

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Remote information concentration (RIC) in d-level systems (qudits) is studied. It is shown that the quantum information initially distributed in three spatially separated qudits can be remotely and deterministically concentrated to a single qudit via an entangled channel without performing any global operations. The entangled channel can be different types of genuine multipartite pure entangled states which are inequivalent under local operations and classical communication. The entangled channel can also be a mixed entangled state, even a bound entangled state which has a similar form to the Smolin state, but has different features from the Smolin state. A common feature of all these pure and mixed entangled states is found; i.e., they have d 2 common commuting stabilizers. The differences of qudit-RIC and qubit-RIC (d = 2) are also analyzed.

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“…Specifically, each photon suffers a variation in its OAM by an amount ∆ = 2 s q z p determined by the charge q and the SAM s z p of the input polarization. q-plates with q = 1 have been recently used to demonstrate interesting spin-OAM quantum information manipulations [29][30][31][32][33] .…”

Section: Resultsmentioning

confidence: 99%

Complete experimental toolbox for alignment-free quantum communication

et al. 2012

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Quantum communication employs the counter-intuitive features of quantum physics for tasks that are impossible in the classical world. It is crucial for testing the foundations of quantum theory and promises to revolutionize information and communication technologies. However, to execute even the simplest quantum transmission, one must establish, and maintain, a shared reference frame. This introduces a considerable overhead in resources, particularly if the parties are in motion or rotating relative to each other. Here we experimentally show how to circumvent this problem with the transmission of quantum information encoded in rotationally invariant states of single photons. By developing a complete toolbox for the efficient encoding and decoding of quantum information in such photonic qubits, we demonstrate the feasibility of alignment-free quantum key-distribution, and perform proofof-principle demonstrations of alignment-free entanglement distribution and Bell-inequality violation. The scheme should find applications in fundamental tests of quantum mechanics and satellite-based quantum communication.

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Experimental generation and characterization of single-photon hybrid ququarts based on polarization and orbital angular momentum encoding

Cited by 78 publications

References 51 publications

Quantum interference between transverse spatial waveguide modes

Quantum interference between transverse spatial waveguide modes

Remote information concentration and multipartite entanglement in multilevel systems

Complete experimental toolbox for alignment-free quantum communication

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