Transmitting quantum information by superposing causal order of mutually unbiased measurements
Manish Kumar Gupta, Ujjwal Sen · arXiv (Cornell University) · 2019
Two quantum measurements sequentially acting one after the other, if they are mutually unbiased, will lead to a complete removal of information encoded in the input quantum state. We find that if the order of the two sequential measurements can be superposed, with a quantum switch, then the information encoded in the input can still be retained in the output state.