Quantum Cryptography

Does a polynomial-length random walk generated by ordinary two-qubit gates form a pseudorandom-unitary ensemble?

• Quantum Cryptography
• Quantum Algorithm
• Quantum circuit complexity
• Computational complexity and computability

Do private-architecture Hamiltonian phase states yield a one-way state generator for explicit polynomial parameters?

• Quantum Cryptography
• Computational complexity and computability
• Quantum state preparation

Can pseudorandom-unitary security scale independently of Hilbert-space dimension while construction uses only polynomially many oracle queries?

• Quantum Cryptography
• Computational complexity and computability
• Quantum circuit complexity

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

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

What is the secret-key capacity of a thermal attenuator for every transmissivity and thermal noise level?

• Quantum Cryptography
• Secret-key distillation
• Bosonic channels

What is the optimal exponential rate of decay of relative-entropy insecurity achievable by two-universal hashing against quantum side information at every positive extraction rate below the conditional entropy?

• Quantum Cryptography
• Secret-key distillation
• Quantum relative entropy

What is the exact secret-key capacity \(K(\mathcal A_p)\) of the qubit amplitude-damping channel for every damping probability \(p\in[0,1]\)?

• Quantum Cryptography
• Quantum Communication
• Secret-key distillation
• Local operations and classical communication

What is the private classical capacity \(P(\Lambda_p)\) of the qubit depolarizing channel, defined for a mixing parameter \(p\in[0,1]\) by

• Quantum Communication
• Quantum Cryptography
• Private capacity
• Additivity and regularization

Does every finite-alphabet Bell-nonlocal behavior have a strictly positive asymptotic secret-key rate against arbitrary individual nonsignalling attacks?

• Quantum Cryptography
• Quantum Resource Theory
• Secret-key distillation
• Device-independent cryptography
• Bell nonlocality

Does an explicit total Boolean family require polynomial shared-state cost for bounded-error one-round \(f\)-routing?

• Quantum Communication
• Quantum Cryptography
• Quantum communication complexity
• Position-based quantum cryptography

Does every finite-dimensional entangled bipartite state have positive asymptotic distillable secret key?

• Quantum Cryptography
• Quantum Resource Theory
• Secret-key distillation
• Bound entanglement
• Local operations and classical communication

Can loss of one qubit held by an honest party reduce the two-way distillable secret key by an arbitrarily large amount?

• Quantum Cryptography
• Quantum Resource Theory
• Secret-key distillation
• Local operations and classical communication