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10 papers · 2 filters
Quantum error correction beyond qubits
Takao Aoki, Go Takahashi, Tadashi Kajiya +4
Quantum computation and communication rely on the ability to manipulate quantum states robustly and with high fidelity. Thus, some form of error correction is needed to protect fra…
Direct and Reverse Secret-Key Capacities of a Quantum Channel
Stefano Pirandola, Raul Garcia-Patron, Samuel L. Braunstein +1
We define the direct and reverse secret-key capacities of a memoryless quantum channel as the optimal rates that entanglement-based quantum key distribution protocols can reach by…
Decoherence-free quantum information in Markovian systems
Manas K. Patra, Peter G. Brooke
Decoherence in Markovian systems can result indirectly from the action of a system Hamiltonian which is usually fixed and unavoidable. Here, we show that in general in Markovian sy…
Maximal Sets of Mutually Unbiased Quantum States in Dimension Six
Stephen Brierley, Stefan Weigert
We study sets of pure states in a Hilbert space of dimension d which are mutually unbiased (MU), that is, the squares of the moduli of their scalar products are equal to zero, one,…
Decoherence-free quantum information in the presence of dynamical evolution
Peter G. Brooke, James D. Cresser, Manas K. Patra
We analyze decoherence-free (DF) quantum information in the presence of an arbitrary non-nearest-neighbor bath-induced system Hamiltonian using a Markovian master equation. We show…
Characterization of Collective Gaussian Attacks and Security of Coherent-State Quantum Cryptography
Stefano Pirandola, Samuel L. Braunstein, Seth Lloyd
We provide a simple description of the most general collective Gaussian attack in continuous-variable quantum cryptography. In the scenario of such general attacks, we analyze the…