In order to mitigate the effect of noise on quantum protocols, quantum error correcting codes have already been proposed in the seminal work of Shor and Steane 7, 8. Noise unveils itself as a major impediment in meeting with these demands 6. However, their implementations inevitably demand generation and transfer of quantum states, applications of various quantum gates and measurements, all within their coherence times. The interest largely owes to a promise of outperforming their classical counterparts, or proposals of altogether novel applications not possible with purely classical resources. The last three decades have witnessed a burgeoning interest in study of quantum communication, quantum computation and, quantum search, to name a few 1, 2, 3, 4, 5. As applications, for illustration, we propose a quantum key distribution protocol and an error-immune information transfer protocol. In fact, we have shown how standard quantum error-correcting codes emerge if suitable restrictions are imposed on the choices of logical basis states. Pertinently, this approach is not in conflict with other existing error correction schemes. This information passes through the noisy channel unchanged. These invariants are functions of expectation values of operators. Armed with this fact, we encode information in these invariants. The encoding scheme is based on the fact that most noisy channels leave some quantities invariant. For this, we have proposed a new information encoding scheme for communication purposes. Motivated particularly by the difficulty in generation of multiparty entangled states, in this paper, we have investigated error-free information transfer with minimal requirements. This calls for exploring realistic solutions which are implementable with current devices. Generation of multiparty higher dimensional entanglement is not easy. Near-term quantum communication protocols suffer inevitably from channel noises, whose alleviation has been mostly attempted with resources such as multiparty entanglement or sophisticated experimental techniques.
0 Comments
Leave a Reply. |