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Quantum Feedback Channels | | Garry Bowen
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11 Sep 2002 | | Journal: | IEEE Trans. Inform. Theory 50, 2429-2433 (2004) | | Subject: | quant-ph | | Abstract: | In Shannon information theory the capacity of a memoryless communication channel cannot be increased by the use of feedback. In quantum information theory the no-cloning theorem means that noiseless copying and feedback of quantum information cannot be achieved. In this paper, quantum feedback is defined as the unlimited use of a noiseless quantum channel from receiver to sender. Given such quantum feedback, it is shown to provide no increase in the entanglement--assisted capacities of a memoryless quantum channel, in direct analogy to the classical case. It is also shown that in various cases of non-assisted capacities, feedback may increase the capacity of memoryless quantum channels. | | Source: | arXiv, quant-ph/0209076 | | Services: | Forum | Review | PDF | Favorites | |
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