Experimental generation of genuine four-partite entangled states with total three-party correlation for continuous variables

Abstract

We experimentally prepare a new type of continuous variable genuine four-partite entangled states, the quantum correlation property of which is different from that of the four-mode GHZ and cluster states, and which has not any qubit counterpart to be proposed at present. In the criterion inequalities for the full inseparability of the genuine four-partite entangled states, the amplitude and phase quadrature correlation variances totally consisting of three-party combination from the four entangled modes are involved. The measured correlation variances among the quadratures of the prepared entangled states satisfy the sufficient requirements for the full inseparability.The type of entangled states has especially potential application in quantum information with continuous quantum variables.

The influence of pump depletion on multipartite continuous-variable entanglement in a frequency non-degenerate parametric amplifier

“…Loock and Furusawa [15] derived inequalities that are easily applicable to tripartite CV entangled states [16][17][18][19]. Genuine four-partite CV entanglement has been generated experimentally [10]. Besides these, a class of N-qubit known as cluster states, introduced by Briegel and Raussendorf [20], allow for universal quantum computation by performing single-qubit measurement [21,22].…”

“…In the field of quantum information, entanglement, which is a very useful information resource, plays a key role in quantum teleportation [1][2][3], quantum dense coding [4,5], quantum key distribution [6], quantum cryptography [7,8] and quantum computation [9][10][11]. Multipartite entangled states have more general construction and properties than bipartite entangled states, which make them indispensable for the application of quantum information science.…”

“…In the positive P representation, the corresponding dynamic equation can be obtained by the Langevin equation, neglecting quantum fluctuation. We derive the semi-classical equations describing the interaction between the pump wave, 0 , and degenerate parametric modes, 1 and 2 , with the initial values 10 …”

The Electronic Spin-Subbands States Entanglement in a Rashba 2D Isotropic Quantum Dot

“…7 Among the many proposals for experimental realizations of quantum information processing, heterostructural systems have the advantage of offering the perspective to integrate a large number of quantum gates into a quantum computer, once the single gate and qubits are established. [8][9][10][11][12] One approach to building a solid-state quantum computer is by exploiting quantum states of artificial atoms (quantum dots) or other nanostructures. 13 14 A common realization of heterostructures is composed of two layers of GaAs and InGaAs, with a planar interface.…”

Gate sequence for continuous variable one-way quantum computation

“…Besides photonic systems [2][3][4][5][6], other QC systems with discrete quantum variables, such as ionic [7-10], superconducting [11][12][13][14][15], and solid state [16-18] systems, have been investigated.In parallel, the theoretical and experimental explorations on one-way CVQC have also been developed [19][20][21][22][23][24][25][26][27][28][29][30]. In contrast to the probabilistic generation of photonic qubits in most cases, CV cluster states are produced in an unconditional fashion and thus the one-way QC with CV cluster states can be implemented deterministically [27][28][29][30][31][32][33][34]. Although individual single-mode and two-mode logical gates towards implementing multimode Gaussian transformation in a one-way CVQC fashion have been experimentally demonstrated by using fourmode cluster entangled states of light [27][28][29][30], CV gate sequences consisting of different single logical elements, which are necessary for realizing practical QC, have not been reported up to now.…”