The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
M. C. Payne - One of the best experts on this subject based on the ideXlab platform.
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All possible bipartite positive-operator-value measurements of two-Photon Polarization states
Physical Review A, 2006Co-Authors: Sebastian E. Ahnert, M. C. PayneAbstract:Here we propose an implementation of all possible positive-operator-value measures (POVMs) of two-Photon Polarization states. POVMs are the most general class of quantum measurements. Our setup requires linear optics, Bell state measurements, and an entangled three-Photon ancilla state, which can be prepared separately and in advance (or 'off-line'). As an example we give the detailed settings for a simultaneous measurement of all four Bell states for an arbitrary two-Photon Polarization state, which is impossible with linear optics alone.
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Nonorthogonal projective positive-operator-value measurement of Photon Polarization states with unit probability of success
Physical Review A, 2004Co-Authors: Sebastian E. Ahnert, M. C. PayneAbstract:In this paper we describe a scheme for performing a nonorthogonal projective positive-operator-value measurement of any arbitrary single-Photon Polarization input state with unit probability of success. While this probability is reached in the limit of infinite cycles of states through the apparatus, only one actual physical setup is required for a feasible implementation. Specifically, our setup implements a set of three nonorthogonal measurement operators at angles of 120 deg. to each other.
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nonorthogonal projective positive operator value measurement of Photon Polarization states with unit probability of success
Physical Review A, 2004Co-Authors: Sebastian E. Ahnert, M. C. PayneAbstract:In this paper we describe a scheme for performing a nonorthogonal projective positive-operator-value measurement of any arbitrary single-Photon Polarization input state with unit probability of success. While this probability is reached in the limit of infinite cycles of states through the apparatus, only one actual physical setup is required for a feasible implementation. Specifically, our setup implements a set of three nonorthogonal measurement operators at angles of 120\ifmmode^\circ\else\textdegree\fi{} to each other.
Sebastian E. Ahnert - One of the best experts on this subject based on the ideXlab platform.
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All possible bipartite positive-operator-value measurements of two-Photon Polarization states
Physical Review A, 2006Co-Authors: Sebastian E. Ahnert, M. C. PayneAbstract:Here we propose an implementation of all possible positive-operator-value measures (POVMs) of two-Photon Polarization states. POVMs are the most general class of quantum measurements. Our setup requires linear optics, Bell state measurements, and an entangled three-Photon ancilla state, which can be prepared separately and in advance (or 'off-line'). As an example we give the detailed settings for a simultaneous measurement of all four Bell states for an arbitrary two-Photon Polarization state, which is impossible with linear optics alone.
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Nonorthogonal projective positive-operator-value measurement of Photon Polarization states with unit probability of success
Physical Review A, 2004Co-Authors: Sebastian E. Ahnert, M. C. PayneAbstract:In this paper we describe a scheme for performing a nonorthogonal projective positive-operator-value measurement of any arbitrary single-Photon Polarization input state with unit probability of success. While this probability is reached in the limit of infinite cycles of states through the apparatus, only one actual physical setup is required for a feasible implementation. Specifically, our setup implements a set of three nonorthogonal measurement operators at angles of 120 deg. to each other.
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nonorthogonal projective positive operator value measurement of Photon Polarization states with unit probability of success
Physical Review A, 2004Co-Authors: Sebastian E. Ahnert, M. C. PayneAbstract:In this paper we describe a scheme for performing a nonorthogonal projective positive-operator-value measurement of any arbitrary single-Photon Polarization input state with unit probability of success. While this probability is reached in the limit of infinite cycles of states through the apparatus, only one actual physical setup is required for a feasible implementation. Specifically, our setup implements a set of three nonorthogonal measurement operators at angles of 120\ifmmode^\circ\else\textdegree\fi{} to each other.
Ya-jun Gao - One of the best experts on this subject based on the ideXlab platform.
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Single-Photon controlled multi-Photon Polarization unitary gate based on weak cross-Kerr nonlinearities
Quantum Information Processing, 2018Co-Authors: Li Dong, Yan-fang Lin, Hai-kuan Dong, Xiao-ming Xiu, Cen Cui, Ya-jun GaoAbstract:With the help of weak cross-Kerr nonlinearities, we propose a single-Photon controlled multi-Photon Polarization unitary gate, which can fulfill the task of n single-Photon controlled one-Photon Polarization unitary gates, but only by adopting a nondestructive measurement and an auxiliary coherent state. Moreover, simple linear optical elements and mature existing techniques containing Homodyne measurement and classical feed-forward are applied. So this scheme provides an efficient and feasible approach for optimally fulfilling single-Photon controlled multi-Photon unitary gate.
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Generation of three-Photon Polarization-entangled decoherence-free states
Annals of Physics, 2016Co-Authors: Li Dong, Yan-fang Lin, Hai-kuan Dong, Xiao-ming Xiu, Ya-jun GaoAbstract:Abstract We present a generation proposal of three-Photon Polarization-entangled decoherence-free states, which are immune to the collective decoherence. Based on weak cross-Kerr nonlinearities, the Polarization and spacial entanglement gates are realized, and thus three-Photon Polarization-entangled decoherence-free states can be produced. According to the outcomes of Homodyne measurement performed in the spacial entanglement gate, one Swap gate is inserted into two paths of the Photon 1 to swap its spacial modes, by means of classical feed forward. In addition, in the process for realizing two entanglement gates, unitary transformation operations are performed on the appropriate Photons conditioned on the different phase shifts occurred on the coherent states, aiming to obtain the same state under two scenarios of the different path compositions of Photons. At the output ports of the circuit, three-Photon Polarization-entangled decoherence-free states which can be utilized to represent two logical qubits, | 0 〉 L and | 1 〉 L are achieved. Apart from Kerr media, only simple linear optical elements and the classical feed forward techniques are necessary in this proposal, facilitating its practical implementation.
Carlos Saavedra - One of the best experts on this subject based on the ideXlab platform.
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Unambiguous modification of nonorthogonal single- and two-Photon Polarization states
Physical Review A, 2009Co-Authors: F. A. Torres-ruiz, J. Aguirre, Aldo Delgado, Gustavo Lima, Leonardo Neves, S. Pádua, Luis Roa, Carlos SaavedraAbstract:In this paper we propose a probabilistic method which allows an unambiguous modification of two nonorthogonal quantum states. We experimentally implement this protocol by using two-Photon Polarization states generated in the process of spontaneous parametric down conversion. In the experiment, for codifying initial quantum states, we consider single-Photon states and heralded detection. We show that the application of this protocol to entangled states allows a fine control of the amount of entanglement of the initial state.
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Unambiguous modification of nonorthogonal single and two Photon Polarization states
arXiv: Quantum Physics, 2008Co-Authors: F. A. Torres-ruiz, J. Aguirre, Gustavo Lima, Leonardo Neves, S. Pádua, Luis Roa, Alain Delgado, Carlos SaavedraAbstract:In this work we propose a probabilistic method which allows an unambiguous modification of two non-orthogonal quantum states. We experimentally implement this protocol by using two-Photon Polarization states generated in the process of spontaneous parametric down conversion. In the experiment, for codifying initial quantum states, we consider single Photon states and heralded detection. We show that the application of this protocol to entangled states, it allows a fine control of the amount of entanglement of the initial state.
Holger F. Hofmann - One of the best experts on this subject based on the ideXlab platform.
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Interferometric weak measurement of Photon Polarization
2011Co-Authors: Masataka Iinuma, Yutaro Suzuki, Taguchi, Yutaka Kadoya, Holger F. HofmannAbstract:We realize a minimum back‐action quantum non‐demolition measurement of variable strength on Photon Polarization in the diagonal(PM) basis by two‐mode path interference. This method uses the phase difference between the positive (P) and negative (M) superpositions in the interference between the horizontal (H) and vertical (V) polarized paths in the input beam. Although the interference can not occur when the H and V Polarizations are distinguishable, a well‐controlled amount of interference is induced by erasing the H and V information using a coherent rotation of Polarization toward a common diagonal Polarization. This method is particularly suitable for the realization of weak measurements, where the control of the back‐action is essential.
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Optimal cloning of single Photon Polarization by coherent feedback of beam splitter losses
New Journal of Physics, 2006Co-Authors: Holger F. Hofmann, Toshiki IdeAbstract:Light fields can be amplified by measuring the field amplitude reflected at a beam splitter of reflectivity R and adding a coherent amplitude proportional to the measurement result to the transmitted field. By applying the quantum optical realization of this amplification scheme to single Photon inputs, it is possible to clone the Polarization states of Photons. We show that optimal cloning of single Photon Polarization is possible when the gain factor of the amplification is equal to the inverse squareroot of 1-R.
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Transfer of single Photon Polarization states by two-channel continuous variable teleportation
arXiv: Quantum Physics, 2005Co-Authors: Toshiki Ide, Holger F. HofmannAbstract:Superpositions of two orthogonal single-Photon Polarization states are commonly used as optical qubits. If such qubits are sent by continuous variable quantum teleportation, the modifications of the qubit states due to imperfect entanglement cause an increase in the average Photon number of the output state. This effect can be interpreted as an accidental quantum cloning of the single Photon input. We analyze the output statistics of the single Photon teleportation and derive the transfer and cloning fidelities from the equations of the Polarization qubit.