Experimental Realization of Linear-Optical Partial swap Gates

Cernoch, A; Soubusta, Jan; Bartůšková, Lucie; Dušek, Miloslav; Fiurášek, Jaromı́r

doi:10.1103/physrevlett.100.180501

Cited by 50 publications

(43 citation statements)

References 23 publications

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“…When θ = 0, the unitary reduces to the two-qubit identity operator, whereas when θ = π, it reduces to the swap operator. When θ = π/2, this gate reduces to the square root of swap or partial swap operator [14,25]. When this partial swap gate is combined with the initial state on CE described above, it was shown in Ref.…”

Section: Realizing Families Of Causal Mapsmentioning

confidence: 99%

Quantum to classical transitions in causal relations

et al. 2017

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The landscape of causal relations that can hold among a set of systems in quantum theory is richer than in classical physics. In particular, a pair of time-ordered systems can be related as cause and effect or as the effects of a common cause, and each of these causal mechanisms can be coherent or not. Furthermore, one can combine these mechanisms in different ways: by probabilistically realizing either one or the other or by having both act simultaneously (termed a physical mixture). In the latter case, it is possible for the two mechanisms to be combined quantum-coherently. Previous work has shown how to experimentally realize one example of each class of possible causal relations. Here, we make a theoretical and experimental study of the transitions between these classes. In particular, for each of the two distinct types of coherence that can exist in mixtures of common-cause and cause-effect relations--coherence in the individual causal pathways and coherence in the way the causal relations are combined--we determine how it degrades under noise and we confirm these expectations in a quantum-optical experiment.Comment: 9 pages, 6 figure

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Section: Realizing Families Of Causal Mapsmentioning

confidence: 99%

Quantum to classical transitions in causal relations

et al. 2017

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“…Its major advantage is high experimental accessibility and relatively low cost [2]. Hence many of the most important quantum information protocols, like teleportation [3], cloning [4][5][6][7], and various quantum gates [2,[8][9][10][11], have been demonstrated using individual photons and linear-optical components. On the other hand, linearoptical quantum computing is burdened by two significant drawbacks related to its probabilistic nature [12][13][14]: first, the success probability decreases exponentially with the number of quantum gates, and second, in a large number of cases there is a need for postselection in order to distinguish the successful and unsuccessful operations of these probabilistic gates.…”

Section: Introductionmentioning

confidence: 99%

Entanglement-assisted scheme for nondemolition detection of the presence of a single photon

Bula¹,

Bartkiewicz²,

Cernoch³

et al. 2013

Phys. Rev. A

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In this paper, we propose a resources-optimal linear-optical scheme for quantum nondemolition detection of single-photon presence. By measuring the state of ancillary photons, the presence of a photon in signal mode is revealed with a success probability of 1/2 without any disturbance to its state. We also show how to tune the setup to perform quantum nondemolition measurement of the signal photon state, and we provide tradeoff between the extracted information and the signal state disturbance. Moreover, the optimality of resources and methods by which to increase the success probability are discussed.

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“…We use the standard encoding of qubits into polarization states of single photons and horizontal and vertical polarization states |H and |V represent the computational basis states |0 and |1 , respectively. Our design is based on the combination of the recently demonstrated linear optical partial SWAP gates [26] and CZ gates [1] less optical elements than previous proposals [28,31] and require stabilization of only a single Mach-Zehnder interferometer. As we shall argue below, proof-of-principle experimental demonstration of the postselected Fredkin gate is fully within the reach of present technology.…”

Section: Introductionmentioning

confidence: 99%

Linear optical Fredkin gate based on partial-SWAP gate

Fiurášek

2008

Phys. Rev. A

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We propose a scheme for linear optical quantum Fredkin gate based on the combination of recently experimentally demonstrated linear optical partial SWAP gate and controlled-Z gates. Both heralded gate and simplified postselected gate operating in the coincidence basis are designed. The suggested setups have a simple structure and require stabilization of only a single Mach-Zehnder interferometer. A proof-of-principle experimental demonstration of the postselected Fredkin gate appears to be feasible and within the reach of current technology.

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Experimental Realization of Linear-Optical Partial swap Gates

Cited by 50 publications

References 23 publications

Quantum to classical transitions in causal relations

Quantum to classical transitions in causal relations

Entanglement-assisted scheme for nondemolition detection of the presence of a single photon

Linear optical Fredkin gate based on partial-SWAP gate

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