2008/10/31 by M. Razavi, M. Piani, N. Lutkenhaus · 1 citation
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physreva.80.032301
published as Phys. Rev. A 80, 032301 (2009) · Extended version with 5 figures
arxiv created 2009/09/12 · arxiv updated 2009/12/01
Memory dephasing and its impact on the rate of entanglement generation in quantum repeaters is addressed. For systems that rely on probabilistic schemes for entanglement distribution and connection, we estimate the maximum achievable rate per employed memory for our optimized partial nesting protocol. We show that, for any given distance L, the polynomial scaling of rate with distance can only be achieved if quantum memories with coherence times on the order of L/c or longer, with c being the speed of light in the channel, are available. The above rate degrades as a power of exp[-√((L/c)/ τc)] with distance when the coherence time τc ≪ L/c.