Enhanced quantum teleportation in the background of Schwarzschild spacetime by weak measurements

Abstract

It is commonly believed that the fidelity of quantum teleportation in the gravitational field would be degraded due to the heat up by the Hawking radiation. In this paper, we point out that the Hawking effect could be eliminated by the combined action of pre-and post-weak measurements, and thus the teleportation fidelity is almost completely protected. It is intriguing to notice that the enhancement of fidelity could not be attributed to the improvement of entanglement, but rather to the probabilistic nature of weak measurements. Our work extends the ability of weak measurements as a quantum technique to battle against gravitational decoherence in relativistic quantum information.

Improving the Precision of Multiparameter Estimation in the Teleportation of Qutrit under Amplitude Damping Noise

“…[10][11][12][13][14] Various approaches for protecting parameter precision against noise have been proposed, such as quantum error correction, [15][16][17] dynamical decoupling, [18] optimal feedback control, [19] correlated effects of the noisy channels, [20,21] and non-Markovianity of the environments. [22][23][24] In addition to the strategies mentioned above, weak measurement (WM) [25][26][27][28][29][30][31][32][33][34][35][36] and environment-assisted measurement (EAM) [37][38][39][40][41] are receiving increasing attentions as new techniques to combat the dissipative noise. A WM operation is an extension of the traditional von Neumann projective measurement.…”

“…In addition to the strategies mentioned above, weak measurement (WM) [ 25–36 ] and environment‐assisted measurement (EAM) [ 37–41 ] are receiving increasing attentions as new techniques to combat the dissipative noise. A WM operation is an extension of the traditional von Neumann projective measurement.…”

Eliminating the Unruh effect of relativistic Dirac fields by partial measurements

“…Moreover, in a relativistic scenario, the QFI teleportation under amplitude damping noise has been enhanced by the technique of partial measurements [17]. In addition, the teleportation fidelity has been enhanced by eliminating the Hawking effect using the partial measurements technique in the background of Schwarzschild space-time [22].…”