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Concurrence Measurement for the Two-Qubit Optical and Atomic States
2015
Entropy
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In the paper, we mainly review some direct concurrence measurement protocols of the two-qubit optical or atomic system. We first introduce the concept of concurrence for a two-qubit system. ...
Second, we explain the approaches of the concurrence measurement in both a linear and a nonlinear optical system. ...
Measures for the Atomic State Besides the optical system, the concurrence measurement protocols for an atomic state have also been investigated. ...
doi:10.3390/e17064293
fatcat:3bzdp6qkknaipassw7zqnnpkk4
Dynamics of quantum correlations and linear entropy in a multi-qubit-cavity system
2004
Journal of Optics B-Quantum and Semiclassical Optics
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Specifically we investigate quantitative relations between the concurrence and linear entropy for a two-qubit mixed system, implemented as two two-level atoms interacting with a single-mode cavity field ...
We present a theoretical study of the relationship between entanglement and entropy in multi-qubit quantum optical systems. ...
Acknowledgments We acknowledge funding from the Clarendon Fund and ORS (AOC), DT-LINK (NFJ) and COLCIENCIAS project 1204-05-13614 (LQ). ...
doi:10.1088/1464-4266/6/8/016
fatcat:65odorb5dzgelnh2k7noiyjcei
Entanglement evolution for quantum trajectories
2011
Journal of Physics, Conference Series
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• For two qubits coupled to a common bath, the time behavior of the mean concurrence depends strongly on the initial state. One may have C(t) = C ρ(t) . ...
Quantum Optics V, Two perfect photon counters make a click when a photon is emitted by the atom i (i = A, B) • If D i detects a photon between t and t + dt, the qubits suffer a quantum jump [occurs with ...
doi:10.1088/1742-6596/306/1/012029
fatcat:q4a3yxtjobbi3iwhvo42ak5fy4
Direct measurement of concurrence for atomic two-qubit pure states
2007
Physical Review A. Atomic, Molecular, and Optical Physics
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We propose a general scheme to measure the concurrence of an arbitrary two-qubit pure state in atomic systems. ...
We show that it is possible to encode the concurrence in the probability of finding all atomic qubits in the ground state. ...
The authors are grateful to T. Schätz for useful discussions. ...
doi:10.1103/physreva.75.032303
fatcat:icbkrg6xjra4xbajcdb3u56jmy
Heralded entanglement of arbitrary degree in remote qubits
2009
Physical Review A. Atomic, Molecular, and Optical Physics
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2009 pre-print arXiv:0901.2592v1 fatcat:gquibd4brjh5llntqhkscflejqOther Versions
The degree of entanglement, as measured by the concurrence, is found to be tunable by two easily accessible experimental parameters. ...
Incoherent scattering of photons off two remote atoms with a Lambda-level structure is used as a basic Young-type interferometer to herald long-lived entanglement of an arbitrary degree. ...
the qubit formed by the two lower states of atom X (X = A, B). ...
doi:10.1103/physreva.80.022312
fatcat:xalc2sue4zed3eopqb7zqaoqz4
Probing quantum entanglement, quantum discord, classical correlation, and the quantum state without disturbing them
2011
Physical Review A. Atomic, Molecular, and Optical Physics
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2013 pre-print arXiv:1307.1761v1 fatcat:6h57xssownamvbu2kgeloy7dya
In this paper, we present schemes for a type of one-parameter bipartite quantum states to probe the quantum entanglement, the quantum discord, the classical correlation and the quantum state based on the ...
It is shown that our detection does not influence all these measured quantities. We also discuss how the spontaneous emission introduced by our probe atom influences our detection. ...
Another two-level atom as a probe qubit interacts with the two optical cavity modes simultaneously.
II. ...
doi:10.1103/physreva.83.012317
fatcat:qrmwjculcvap5k22atikh4wtoa
Proposal for direct measurement of concurrence via visibility in a cavity QED system
2008
Physical Review A. Atomic, Molecular, and Optical Physics
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The scheme works for any arbitrary pure initial state of the two-qubit cavity system. ...
It is based on the cavity-QED technology using atoms as flying qubits and relies on the identity of the two-particle visibility of the atomic probability with the concurrence of the cavity system. ...
The proposed scheme to measure the concurrence of a two-qubit cavity system. Atoms 1 and 2 are prepared in their ground state. ...
doi:10.1103/physreva.77.040301
fatcat:ngalmfxyvfgzrntugfwzsm4dwq
Entanglement generation in a system of two atomic quantum dots coupled to a pool of interacting bosons
2013
Physical Review A. Atomic, Molecular, and Optical Physics
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The tripartite system of two atomic quantum dots and a pool of bosons reduces to a qubit-qutrit-qubit realization. ...
The bipartite setup of only one atomic quantum dot coupled to a pool of bosons turns out to be equivalent to two qubits which easily get entangled being initially in a product state. ...
Although an entanglement measure is not unambiguously defined for a tripartite hybrid system (one qutrit and two qubits) one can calculate a concurrence [34] : C(| ) = 3 − 3 i=1 Trρ 2 i , (12) where ρ ...
doi:10.1103/physreva.88.042302
fatcat:w2mwnsek6nad5i2rpxaz2buodm
Position-dependent dynamics of two qubits in a leakage cavity
2008
Journal of Physics B: Atomic, Molecular and Optical Physics
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The position-dependent entanglement dynamics of two qubits embedded in a leakage cavity is investigated. The two qubits are initialled in Bell states and the cavity mode is taken as a standing wave. ...
It is found that (i) the dynamics of the Bell states can be divided into two groups according to one-photon entangled states and two-photon entangled states; (ii) the entanglement life of the one-photon ...
Acknowledgments We would like to acknowledge the support from the National Natural Science Foundation of China under grant nos. 10575068, 10474062 and 10547126, Shanghai Education Foundation for Young ...
doi:10.1088/0953-4075/41/13/135502
fatcat:drbnzrh2fraufeoxziysglvtri
Reversing entanglement change by a weak measurement
2010
Physical Review A. Atomic, Molecular, and Optical Physics
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The reversal procedure involves another weak measurement, preceded and followed by bit flips applied to both qubits. ...
For the amplitudedamping case, the entanglement partially recovers under most conditions. For the weak-measurement case, the recovery of the initial entangled state is exact. ...
State map for a single qubit The two main operations in our scheme are amplitude damping and weak measurement. Here we discuss their state maps in the single-qubit case for better understanding. ...
doi:10.1103/physreva.82.052323
fatcat:vciff6py55dnznw7fdxxmvveoi
Entanglement and Bell violation with phase decoherence or dissipation
2005
European Physical Journal D : Atomic, Molecular and Optical Physics
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2003 accepted arXiv:quant-ph/0303026v3 fatcat:g7amz5b64bdkzfwk2xb57ihc4mOther Versions
We adopt the concurrence to characterize the entanglement between atom and cavities or between two optical cavities in the presence of the phase decoherence. ...
Finally, we show that even if the atom is initially prepared in a maximally mixed state, it can also entangle the two mode cavity fields. ...
THE ENTANGLEMENT BETWEEN ATOM AND CAVITIES OR TWO OPTICAL CAVITIES In order to quantify the degree of entanglement, several measures [13] of entanglement have been introduced for both pure and mixed ...
doi:10.1140/epjd/e2005-00083-y
fatcat:xyu4klm4lrfirgsurodgv5efea
Controlling Entanglement Dynamics by Choosing Appropriate Ratio between Cavity-Fiber Coupling and Atom-Cavity Coupling
2010
Communications in Theoretical Physics
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2010 pre-print arXiv:1004.4395v1 fatcat:lrw32hma65hlla54r7biw4irp4Other Versions
The entanglement characteristics including the so-called sudden death effect between two identical two-level atoms trapped in two separate cavities connected by an optical fiber are studied. ...
The results show that the time evolution of entanglement is sensitive not only to the degree of entanglement of the initial state but also to the ratio between cavity-fiber coupling () and atom-cavity ...
The concurrence ( ) C ρ for the reduced density matrix ρ of a two-qubit system is defined as arranged in decreasing order. ...
doi:10.1088/0253-6102/54/4/17
fatcat:66xhx23lpvbzjcc7crn363w5iy
Scheme for on-resonance generation of entanglement in time-dependent asymmetric two-qubit-cavity systems
2004
Physical Review A. Atomic, Molecular, and Optical Physics
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2003 pre-print arXiv:quant-ph/0311111v1 fatcat:dbjp3ilvfbfetju6shbe4zzg24
We present an efficient scheme for the controlled generation of pure two-qubit states possessing any desired degree of entanglement and a prescribed symmetry in two cavity QED based systems, namely, cold ...
trapped ions and flying atoms. ...
We investigate the dynamical evolution of the concurrence C(ρ a,a ) which measures the degree of two-qubit entanglement [10] , and the two-qubit correlation function σ + 2 σ − 1 which measures the degree ...
doi:10.1103/physreva.70.020301
fatcat:3dtpm2d4yzbnfme6ipi7t3w3mq
Protecting quantum entanglement from amplitude damping
2013
Journal of Physics B: Atomic, Molecular and Optical Physics
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2012 pre-print arXiv:1208.4187v1 fatcat:a7iqqgbwozhtvanty5nhx2audmOther Versions
Quantum entanglement is a critical resource for quantum information and quantum computation. ...
As opposed to some recently studied methods, the scheme presented here does not require weak measurement in the reversal process, leading to a faster recovery of entanglement. ...
ACKNOWLEDGMENT This work is supported by grants from the King Abdulaziz City for Science and Technology (KACST) and from the Qatar National Research Fund (QNRF) under the NPRP project 4-520-1-083. ...
doi:10.1088/0953-4075/46/14/145501
fatcat:vvy7prvm5zdphp6lizjazbkf7u
Quantum entanglement for two qubits in a nonstationary cavity
2016
Physical Review A
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2016 pre-print arXiv:1610.04665v1 fatcat:dh3kwrghhnbwhkgnp5e45rjk5e
The quantum entanglement and the probability of the dynamical Lamb effect for two qubits caused by non-adiabatic fast change of the boundary conditions are studied. ...
The conditional concurrence of the qubits for each fixed number of created photons in a nonstationary cavity is obtained as a measure of the dynamical quantum entanglement due to the dynamical Lamb effect ...
It is well-known that the possible measure of quantum entanglement of two qubits is the concurrence C [21] [22] [23] , defined for the two-qubit state |Φ |Φ = a |00 + b |01 + c |10 + d |11 (19) as C(Φ ...
doi:10.1103/physreva.94.052308
fatcat:wx43nfa7q5htzjofkumgtnskzy
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