Alexander V Sergienko; Saverio Pascazio; Paolo Villoresi's Quantum communication and quantum networking : First PDF

By Alexander V Sergienko; Saverio Pascazio; Paolo Villoresi

ISBN-10: 3642117317

ISBN-13: 9783642117312

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Read or Download Quantum communication and quantum networking : First International Conference, QuantumComm 2009, Naples, Italy, October 26-30, 2009, Revised selected papers PDF

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Extra info for Quantum communication and quantum networking : First International Conference, QuantumComm 2009, Naples, Italy, October 26-30, 2009, Revised selected papers

Example text

From Eq. (10) it follows that the probability of obtaining the vector c := (a1 , . . an , b1 , . . e. it is the noise introduced by the heterodyne measurement). Analogously from Eq. (9) the conditional probability of measuring c, given that the codeword C was sent, is the Gaussian P (c|C) exp − (c − C)(Vin + V + I/2)−1 (c − C)T . 2 (12) The Shannon entropy of the decoded codeword c, measured in bits, is hence given by the expression 1 H(c) = log2 [det (Vin + V + Vc + I/2)]. (13) 2 Analogously, the conditional entropy is H(c|C) = 1 log2 [det (Vin + V + I/2)], 2 independently on the value of the encoded codeword C.

It is noted that for these optimal choices of µ and ν, the states in Eqs. (5) and (6) are already W states and the local filtering is not necessary. 2 Experimental Method In our √ experiment, we used a sub-optimal choice of the PDBS parameters, µ = (7 + 17)/16 and ν = 1/2. One of the reasons for this choice is that the twophoton interference for the V polarization is observed with a high visibility, which makes the alignment easier and gives us a clue about how well the two photons from different pairs are overlapped at the PDBS.

The dark count probability and afterpulsing probability is considerably lower than the other reported APD-based SPDs, while our APD-based SPD achieved the highest repetition frequency. Figure 3(a) shows the time histogram of detection events when a gate repetition frequency ωg was 2 GHz. 15 Quantum efficiency η Fig. 2. 1 (a) (b) Gate period (500 ps) Jitter error Photon counts (a. 2 Quantum efficiency η Fig. 3. Jitter characteristics. (a)Time histogram of detection events. (b) Probability for the jitter error as a function of the quantum efficiency η.

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Quantum communication and quantum networking : First International Conference, QuantumComm 2009, Naples, Italy, October 26-30, 2009, Revised selected papers by Alexander V Sergienko; Saverio Pascazio; Paolo Villoresi


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