Abstract-We propose here a new construction of spatially coupled quantum LDPC codes using a small amount of entangled qubit pairs shared between the encoder and the decoder which improves quite significantly all other constructions of quantum LDPC codes or turbo-codes with the same rate.

We propose here a new construction of quantum codes combining an improved version of a family of spatially coupled quantum LDPC codes, suggested in [1], with a family of error reducing turbo-codes of [2]. This new construction displays outstanding performances under iterative decoding for noise levels very close to the hashing bound, without needing qubits, protected from noise as in [1].

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