6 papers · 1 filter
The spatiotemporal Born rule is quasiprobabilistic
James Fullwood, Zhihao Ma, Zhen Wu
Contrary to general relativity, quantum theory treats space and time in fundamentally different ways. In particular, while joint probabilities associated with spacelike separated m…
On small perturbations of coherent information
Zhen Wu, Zhihao Ma, James Fullwood
Quantum capacity quantifies the amount of quantum information that can be transmitted by a quantum channel with an arbitrary small probability of error. Mathematically, the quantum…
Extreme Capacities in Generalized Direct Sum Channels
Zhen Wu, Si-Qi Zhou
Quantum channel capacities play a central role in quantum Shannon theory, a formalism built upon rigorous coding theorems for noisy channels. Evaluating exact capacity values for g…
Super-additivity of quantum capacity in simple channels
Zhen Wu, Qi Zhao, Zhihao Ma
The super-additivity of quantum channel capacity is an important feature of quantum information theory different from classical theory, which has been attracting attention. Recentl…
Quantum Mutual Information in Time
James Fullwood, Zhen Wu, Arthur J. Parzygnat +1
While the quantum mutual information is a fundamental measure of quantum information, it is only defined for spacelike-separated quantum systems. Such a limitation is not present i…
General Communication Enhancement via the Quantum Switch
Zhen Wu, James Fullwood, Zhihao Ma +3
Recent studies have shown that quantum information may be effectively transmitted by a finite collection of completely depolarizing channels in a coherent superposition of differen…