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This research establishes an exponential gap in communication complexity for total Boolean functions, proving that pre-shared entanglement drastically reduces the quantum resources required compared to unentangled protocols. The findings resolve a longstanding theoretical debate by demonstrating that specific computations can be performed with logarithmic bits of classical information when entanglement is available, rather than the polynomial qubit count needed otherwise. This advancement clarifies the fundamental efficiency limits and potential savings of utilizing shared quantum states in one-way communication models.
Entanglement Assists Computation Using Few Bits yet Needs More Quantum Data

An exponential divide has emerged between how little information entangled systems need versus unentangled ones to perform certain computations. A specific task now requires just O(log n) bits using pre-shared entanglement, yet demands Ω(n^(1/3)) qubits when performed without it. This resolves an open question concerning total Boolean functions and highlights the power of utilising shared quantum states for efficiency gains.
Shared entanglement sharply reduces the amount of quantum information needed to compute certain tasks; total Boolean functions require fewer qubits with prior entanglement than without it. These functions can be computed using only logarithmic bits of classical communication when entanglement is available beforehand. Sharing entanglement, a uniquely quantum connection between particles, sharply reduces the resources needed for specific computations. The team demonstrated this advantage using functions requiring more standard quantum messaging without pre-shared entanglement; these same tasks…
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