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Publikováno v:
Theory of Cryptography: Second Theory of Cryptography Conference, TCC 2005, J.Kilian (ed.) Springer Verlag 2005, vol. 3378 of Lecture Notes in Computer Science, pp. 386-406
The existing unconditional security definitions of quantum key distribution (QKD) do not apply to joint attacks over QKD and the subsequent use of the resulting key. In this paper, we close this potential security gap by using a universal composabili
Externí odkaz:
http://arxiv.org/abs/quant-ph/0409078
Publikováno v:
Quantum Information and Computation 3, 97 (2003)
We compute the asymptotic entanglement capacity of the Ising interaction ZZ, the anisotropic Heisenberg interaction XX + YY, and more generally, any two-qubit Hamiltonian with canonical form K = a XX + b YY. We also describe an entanglement assisted
Externí odkaz:
http://arxiv.org/abs/quant-ph/0207052
Publikováno v:
IEEE Trans. Inf. Theory, Vol. 49, No. 8, (2003) p.1895-1911
We consider interactions as bidirectional channels. We investigate the capacities for interaction Hamiltonians and nonlocal unitary gates to generate entanglement and transmit classical information. We give analytic expressions for the entanglement g
Externí odkaz:
http://arxiv.org/abs/quant-ph/0205057
Autor:
Leung, D. W.
Publikováno v:
J. Math. Phys., Vol. 44, No. 2 (2003) p. 528-33
Quantum process tomography is a procedure by which an unknown quantum operation can be fully experimentally characterized. We reinterpret Choi's proof of the fact that any completely positive linear map has a Kraus representation [Lin. Alg. and App.,
Externí odkaz:
http://arxiv.org/abs/quant-ph/0201119
Autor:
Leung, D. W., Shor, P. W.
Publikováno v:
Phys. Rev. Lett., Vol. 90 (2003) 127905
We consider remote state preparation protocols for a set of pure states whose projectors form a basis for operators acting on the input Hilbert space. If a protocol (1) uses only forward communication and entanglement, (2) deterministically prepares
Externí odkaz:
http://arxiv.org/abs/quant-ph/0201008
Autor:
Leung, D. W.
Nielsen [quant-ph/0108020] showed that universal quantum computation is possible given quantum memory and the ability to perform projective measurements on up to 4-qubits. We describe an improved method that requires only 2-qubit measurements, which
Externí odkaz:
http://arxiv.org/abs/quant-ph/0111122
Autor:
Leung, D. W.
Publikováno v:
J. Mod. Opt., Vol. 49, No. 8 (2002) p. 1199-1217
The ability to simulate one Hamiltonian with another is an important primitive in quantum information processing. In this paper, a simulation method for arbitrary $\sigma_z \otimes \sigma_z$ interaction based on Hadamard matrices (quant-ph/9904100) i
Externí odkaz:
http://arxiv.org/abs/quant-ph/0107041
Autor:
Bennett, C. H., Cirac, J. I., Leifer, M. S., Leung, D. W., Linden, N., Popescu, S., Vidal, G.
Publikováno v:
Phys. Rev. A, 66 (2002) 012305
We consider the simulation of the dynamics of one nonlocal Hamiltonian by another, allowing arbitrary local resources but no entanglement nor classical communication. We characterize notions of simulation, and proceed to focus on deterministic simula
Externí odkaz:
http://arxiv.org/abs/quant-ph/0107035
Autor:
Leung, D. W.
Publikováno v:
Quantum Information and Computation Vol.2. No.1 p.14-34 (2002)
We discuss aspects of secure quantum communication by proposing and analyzing a quantum analog of the Vernam cipher (one-time-pad). The quantum Vernam cipher uses entanglement as the key to encrypt quantum information sent through an insecure quantum
Externí odkaz:
http://arxiv.org/abs/quant-ph/0012077