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By V. M. Akulin, G. Kurizki, S. Pellegrin (auth.), V.M. Akulin, A. Sarfati, G. Kurizki, S. Pellegrin (eds.)

This ebook is a suite of articles at the modern prestige of quantum mechanics, devoted to the basic problems with entanglement, decoherence, irreversibility, details processing, and keep watch over of quantum evolution, with a view of attainable purposes. It has multidisciplinary personality and is addressed at a large readership in physics, laptop technological know-how, chemistry, and electric engineering. it really is written by way of the world-leading specialists in pertinent fields comparable to quantum computing, atomic, molecular and optical physics, condensed topic physics, and statistical physics.

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The expected result in the mode b2 H (V) for the case when the photon in b4 is horizontally polarized. We can see in a similar way that the gate works also for the cases when the control photon is vertically polarized, or is polarized at 45◦ . Our experimental setup is shown in Fig. 3. An ultraviolet pulsed laser, centered at wavelength 398 nm, with pulse duration 200 fs and a repetition rate 76 MHz, impinges on a BBO crystal [Kwiat 1995] producing probabilistically the first pair in the spatial modes a1 and a2 : these two photons are fed into the gate as the input qubits.

When one and only one photon is detected at the polarization sensitive detectors in the spatial modes b3 and b4 and in the polarization H, the scheme works as a CNOT gate. b1 D1 Control Bit a3 EPR a4 a2 b2 D2 Target Bit b4 H/V D4 The scheme works in those cases where one and only one photon is found in each of the modes b3 , b4 ; when both photons are H-polarized no further transformation is necessary on the output state (usually this is referred to as passive operation). The scheme combines two simple gates, namely, the destructive CNOT and the quantum encoder.

Our experimental setup is shown in Fig. 3. An ultraviolet pulsed laser, centered at wavelength 398 nm, with pulse duration 200 fs and a repetition rate 76 MHz, impinges on a BBO crystal [Kwiat 1995] producing probabilistically the first pair in the spatial modes a1 and a2 : these two photons are fed into the gate as the input qubits. The UV laser is then reflected back by the mirror M1 and, passing through the crystal for the second time, produces the entangled ancilla pair in spatial modes a3 and a4 .

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