Efficient entanglement concentration for quantum dot and optical microcavities systems

Sheng, Yu‐Bo; Zhou, Lan; Wang, Lei; Zhao, Shengmei

doi:10.1007/s11128-012-0502-8

Cited by 57 publications

(22 citation statements)

References 40 publications

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“…Thus our four Toffoli gates are deterministic and faithful. However, the side leakage from the cavity is unavoidable in the experiment [32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47]. In this case, the reflectance coefficients r 0 and r h are shown in figure 7.…”

Section: Discussionmentioning

confidence: 92%

Universal remote quantum computation assisted by the cavity input–output process

Luo

Wang

2015

Proc. R. Soc. A.

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Quantum computing may provide potential superiority to solve some difficult problems. We propose a scheme for scalable remote quantum computation based on an interface between the photon and the spin of an electron confined in a quantum dot embedded in a microcavity. By successively interacting auxiliary photon pulses with spins charged in optical cavities, a prototypical quantum controlled-controlled flip gate (Toffoli gate) is achieved on a remote three-spin system using only one Einstein-Podolsky-Rosen entanglement, and local operations and classical communication. Our proposed model is shown to be robust to practical noise and experimental imperfections in current cavity-quantum electrodynamics techniques.

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Section: Discussionmentioning

confidence: 92%

Universal remote quantum computation assisted by the cavity input–output process

Luo

Wang

2015

Proc. R. Soc. A.

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“…Therefore, there are no technical difficulties with the photon detectors. It have been proved by many previous schemes [76][77][78][79][80][81][82][83][84] that the QDs and double-sided optical microcavities coupled system can worked efficiently in weak coupling regime. In our scheme, the fidelities of spin Bell states and GHZ states are mostly influenced by the efficiency of QDs inside double-sided optical microcavities.…”

Section: Discussion Of Feasibilitymentioning

confidence: 99%

Efficient spin Bell states and Greenberger–Horne–Zeilinger states analysis in the quantum dot–microcavity coupled system

Kang

Yan

2015

Appl. Phys. B

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motivated an intensive research in the generation and the manipulation of entangled states.Typical two particles bipartite entangled states are Bell states [19], and they can be used in a large quantity of quantum communication schemes. So, the complete and determinate analysis of the Bell states is a crucial step in QIP. On the other hand, multiparticle systems also attract more and more attentions of researchers, referred to as Greenberger-Horne-Zeilinger (GHZ) states [20], W states [21], and cluster states [22], etc. Especially, the GHZ states [20], which can provide possibilities to test quantum mechanics against local hidden theory without inequality [19], is one of the most important resource in QIP. Till now, due to the large information capacity, great interest has arisen regarding the significant role of GHZ states in the foundations of quantum mechanics measurement theory and quantum communication [23][24][25][26][27][28][29]. Contrary to bipartite entangled states, GHZ states exhibit a special kind of entanglement between N ≥ 3 parties, providing a possibility to test quantum nonlocality in a one-shot manner. So, of common interest is the problem of how to realize the GHZ states analysis using current technologies.We all know that an analyzer that can completely and determinately distinguish all of the Bell states and the GHZ states without destroying quantum qubits is a very powerful tool. Thus, lots of Bell states and GreenbergerHorne-Zeilinger states analysis schemes [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] have been proposed for different systems with several methods. For example, Walborn et al. [36] have proposed a simple scheme for complete Bell states measurement of photons using hyperentangled states. Houwelingen et al. [41] have proposed a scheme, which can distinguish two of the eight maximally entangled polarized photon GHZ states. Sheng et al. have proposed a Bell state analysis scheme [45] with quantum nondemolition detectorsAbstract We propose a scheme for spin Bell states and GHZ states analysis with quantum dots inside double-sided optical microcavities. The proposed setup involves simple linear optical elements, single polarized photon, and the conventional photon detectors that only distinguish the vacuum and nonvacuum Fock number states. This makes the protocol more realizable in experiments. Numerical simulation shows that the high fidelities can be realized when the side leakage and cavity loss are low, which is feasible in the weak-coupling regime. With all the advantages above, our scheme could be useful in quantum communication processing.

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“…However, the second ECP of Wang et al is still not an optimal one. In this section, we will describe the efficient ECP for such entangled electrons with the help of only one single photon [102]. Compared with the ECPs of Wang et al, the most significant advantage is that during the whole ECP, the single photon only needs to pass through one microcavity, which will increase the total success probability if the cavity is imperfect.…”

Section: Efficient Entanglement Concentration For Quantum Dot and Optmentioning

confidence: 99%

“…Figure 23. Success probability, P , for obtaining a maximally entangled state after performing this ECP is altered with the initial coefficient, α ∈ (0, 1) [102]. Curve A is the ideal case with no leakage.…”

Section: Efficient Entanglement Concentration For Quantum Dot and Optmentioning

confidence: 99%

Quantum Entanglement Concentration Based on Nonlinear Optics for Quantum Communications

Sheng

Zhou

2013

Entropy

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Entanglement concentration is of most importance in long distance quantum communication and quantum computation. It is to distill maximally entangled states from pure partially entangled states based on the local operation and classical communication.In this review, we will mainly describe two kinds of entanglement concentration protocols. One is to concentrate the partially entangled Bell-state, and the other is to concentrate the partially entangled W state. Some protocols are feasible in current experimental conditions and suitable for the optical, electric and quantum-dot and optical microcavity systems.

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Efficient entanglement concentration for quantum dot and optical microcavities systems

Cited by 57 publications

References 40 publications

Universal remote quantum computation assisted by the cavity input–output process

Universal remote quantum computation assisted by the cavity input–output process

Efficient spin Bell states and Greenberger–Horne–Zeilinger states analysis in the quantum dot–microcavity coupled system

Quantum Entanglement Concentration Based on Nonlinear Optics for Quantum Communications

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