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- Joonwoo Bae, Antonio Acín
- Physical review letters
- 2006

The impossibility of perfect cloning and state estimation are two fundamental results in quantum mechanics. It has been conjectured that quantum cloning becomes equivalent to state estimation in the asymptotic regime where the number of clones tends to infinity. We prove this conjecture using two known results of quantum information theory: the monogamy of… (More)

- M Navascués, J Bae, J I Cirac, M Lewestein, A Sanpera, A Acín
- Physical review letters
- 2005

We study the secrecy properties of Gaussian states under Gaussian operations. Although such operations are useless for quantum distillation, we prove that it is possible to distill a secret key secure against any attack from sufficiently entangled Gaussian states with nonpositive partial transposition. Moreover, all such states allow for key distillation,… (More)

Quantum state discrimination underlies various applications in quantum information processing tasks. It essentially describes the distinguishability of quantum systems in different states, and the general process of extracting classical information from quantum systems. It is also useful in quantum information applications, such as the characterisation of… (More)

- Hyang-Tag Lim, Yong-Su Kim, Young-Sik Ra, Joonwoo Bae, Yoon-Ho Kim
- Physical review letters
- 2011

We report the first experimental realization of an approximate partial transpose for photonic two-qubit systems. The proposed scheme is based on the local operation on single copies of quantum states and classical communication, and therefore can be easily applied for other quantum information tasks within current technologies. Direct detection of… (More)

- Joonwoo Bae, Won-Young Hwang, Yeong-Deok Han
- Physical review letters
- 2011

We provide a general framework of utilizing the no-signaling principle in derivation of the guessing probability in the minimum-error quantum state discrimination. We show that, remarkably, the guessing probability can be determined by the no-signaling principle. This is shown by proving that, in the semidefinite programing for the discrimination, the… (More)

- Joonwoo Bae
- Scientific reports
- 2015

Distinguishability is a fundamental and operational measure generally connected to information applications. In quantum information theory, from the postulates of quantum mechanics it often has an intrinsic limitation, which then dictates and also characterises capabilities of related information tasks. In this work, we consider discrimination between… (More)

- Joonwoo Bae, Younghun Kwon
- 2008

There are hamiltonians that solve a search problem of finding one of N items in O(√ N) steps. They are hamiltonians to describe an oscillation between two states. In this paper we propose a generalized search hamil-tonian, Hg. Then the known search hamiltonians become special cases of Hg. From the generalized search hamiltonian, we present remarkable… (More)

- Joonwoo Bae
- Reports on progress in physics. Physical Society
- 2017

In quantum information processing it may be possible to have efficient computation and secure communication beyond the limitations of classical systems. In a fundamental point of view, however, evolution of quantum systems by the laws of quantum mechanics is more restrictive than classical systems, identified to a specific form of dynamics, that is, unitary… (More)

- Joonwoo Bae, Dariusz Chruściński
- Physical review letters
- 2016

In this work, we show the operational characterization to the divisibility of dynamical maps in terms of the distinguishability of quantum channels. It is proven that the distinguishability of any pair of quantum channels does not increase under divisible maps, in which the full hierarchy of divisibility is isomorphic to the structure of entanglement… (More)

- Joonwoo Bae, Younghun Kwon
- 2008

Farhi et al. suggested the analogue quantum search Hamiltonian and Fenner also proposed the intuitive quantum search Hamiltonian. Recently the generalized quantum search Hamiltonian containning hamiltonians of Farhi et al. and Fenner was presented in quant-ph/0110020. In this letter, we analyze the running time of the generalized quantum search Hamiltonian.… (More)