Superactivation

Does every entangled bipartite state become Bell nonlocal under collective local measurements on some finite number of copies?

• Quantum Resource Theory
• Superactivation
• Bell nonlocality
• Quantum separability

Can two classical sources, each with zero secret-key rate between two honest parties, yield a positive secret-key rate when used jointly?

• Quantum Cryptography
• Superactivation
• Secret-key distillation

Can two bipartite quantum states with zero distillable secret key yield positive distillable secret key when used jointly?

• Quantum Cryptography
• Quantum Resource Theory
• Superactivation
• Secret-key distillation

Can two quantum channels with zero two-way-assisted secret-key capacity have positive secret-key capacity when used jointly?

• Quantum Cryptography
• Quantum Communication
• Superactivation
• Secret-key distillation

Is there a single-mode phase-insensitive Gaussian amplifier or additive-noise channel of zero finite-energy quantum capacity that acquires positive finite-energy quantum capacity when used in parallel with a two-mode positive-partial-transpose Gaussian channel…

• Quantum Communication
• Superactivation
• Quantum capacity
• Bosonic channels

What necessary and sufficient structural conditions characterize the finite-dimensional channels of zero quantum capacity, and separately those of zero private capacity, that acquire a positive capacity of the same kind when used in parallel with some antidegradable…

• Quantum Communication
• Quantum Cryptography
• Superactivation
• Quantum capacity
• Private capacity
• Channel degradability