scholarly journals Creation of Greenberger-Horne-Zeilinger states with thousands of atoms by entanglement amplification

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Yajuan Zhao ◽  
Rui Zhang ◽  
Wenlan Chen ◽  
Xiang-Bin Wang ◽  
Jiazhong Hu
Keyword(s):  
Hilbert Space ◽  
Spin State ◽  
Optical Cavity ◽  
Single Frequency ◽  
Entangled States ◽  
Quantum Metrology ◽  
Atom Number ◽  
Ghz States ◽  
High Finesse ◽  
Coherent Spin

AbstractWe propose an entanglement-creation scheme in a multi-atom ensemble trapped in an optical cavity, named entanglement amplification, converting unentangled states into entangled states and amplifying less-entangled ones to maximally entangled Greenberger-Horne-Zeilinger (GHZ) states whose fidelity is logarithmically dependent on the atom number and robust against common experimental noises. The scheme starts with a multi-atom ensemble initialized in a coherent spin state. By shifting the energy of a particular Dicke state, we break the Hilbert space of the ensemble into two isolated subspaces to tear the coherent spin state into two components so that entanglement is introduced. After that, we utilize the isolated subspaces to further enhance the entanglement by coherently separating the two components. By single-particle Rabi drivings on atoms in a high-finesse optical cavity illuminated by a single-frequency light, 2000-atom GHZ states can be created with a fidelity above 80% in an experimentally achievable system, making resources of ensembles at Heisenberg limit practically available for quantum metrology.

Coherent spin state transfer from light to electrons in a semiconductor

2009 ◽  
Author(s):  
H. Kosaka ◽  
H. Shigyou ◽  
Y. Mitsumori ◽  
Y. Rikitake ◽  
H. Imamura ◽  
...  
Keyword(s):  
Spin State ◽  
State Transfer ◽  
Coherent Spin

High finesse pulsed optical cavity locking by tilt-locking technique

2014 ◽  
Vol 85 (3) ◽  
pp. 033102 ◽  
Author(s):  
Y. You ◽  
R. Chiche ◽  
L. X. Yan ◽  
W. H. Huang ◽  
C. X. Tang ◽  
...  
Keyword(s):  
Optical Cavity ◽  
High Finesse

scholarly journals Preparation of Entangled States through Hilbert Space Engineering

2016 ◽  
Vol 117 (14) ◽  
Author(s):  
Y. Lin ◽  
J. P. Gaebler ◽  
F. Reiter ◽  
T. R. Tan ◽  
R. Bowler ◽  
...  
Keyword(s):  
Hilbert Space ◽  
Entangled States

Radiation-pressure effects upon a micromirror in a high-finesse optical cavity

2008 ◽  
Author(s):  
A. Heidmann ◽  
O. Arcizet ◽  
C. Molinelli ◽  
T. Briant ◽  
P.-F. Cohadon
Keyword(s):  
Radiation Pressure ◽  
Optical Cavity ◽  
Pressure Effects ◽  
High Finesse

Teleportation and dense coding via a multiparticle quantum channel of the GHZ-class

2002 ◽  
Vol 2 (5) ◽  
pp. 367-378
Author(s):  
V.N. Gorbachev ◽  
A.I. Zhiliba ◽  
A.I. Trubilko ◽  
A.A. Rodichkina
Keyword(s):  
Quantum Channel ◽  
Entangled States ◽  
Dense Coding ◽  
Ghz States ◽  
Classical Capacity ◽  
Coding Schemes ◽  
One To One

A set of protocols for teleportation and dense coding schemes based on a multiparticle quantum channel, represented by the $N$-particle entangled states of the GHZ class, is introduced. Using a found representation for the GHZ states, it was shown that for dense coding schemes enhancement of the classical capacity of the channel due from entanglement is $N/N-1$. Within the context of our schemes it becomes clear that there is no one-to one correspondence between teleportation and dense coding schemes in comparison when the EPR channel is exploited. A set of schemes, for which two additional operations as entanglement and disentanglement are permitted, is considered.

Quantum Interference

2019 ◽  
pp. 66-88
Author(s):  
Jeffrey A. Barrett
Keyword(s):  
Hilbert Space ◽  
Wave Function ◽  
Quantum Mechanics ◽  
Quantum Interference ◽  
Standard Theory ◽  
Quantum Decoherence ◽  
Entangled States ◽  
Quantum Mechanical ◽  
Standard Formulation ◽  
Complex Valued

Moving to more subtle experiments, we consider how the standard formulation of quantum mechanics predicts and explains interference phenomena. Tracking the conditions under which one observes interference phenomena leads to the notion of quantum decoherence. We see why one must sharply distinguish between collapse phenomena and decoherence phenomena on the standard formulation of quantum mechanics. While collapses explain determinate measurement records, environmental decoherence just produces more complex, entangled states where the physical systems involved lack ordinary physical properties. We characterize the quantum-mechanical wave function as both an element of a Hilbert space and a complex-valued function over a configuration space. We also discuss how the wave function is interpreted in the standard theory.

Controlled quantum key agreement based on maximally three-qubit entangled states

2020 ◽  
Vol 34 (18) ◽  
pp. 2050201
Author(s):  
Jie Tang ◽  
Lei Shi ◽  
Jiahua Wei
Keyword(s):  
Performance Analysis ◽  
Key Agreement ◽  
Entangled States ◽  
Quantum Key Agreement ◽  
Ghz States ◽  
Participant Attack ◽  
Significant Change

In this paper, we propose a two-party and a three-party controlled quantum key agreement (QKA) protocols with three-qubit GHZ states and Bell measurements. Compared with previous protocols, the significant change of our schemes is that a supervisor is introduced for controlling the agreement process to improve the controllability. Moreover, our protocols ensure each communication participant contribute equally to the agreement keys, and all participants can negotiate the shared keys without exchanging classical bits between them. The performance analysis shows that our protocols can be immune to outsider and participant attack.

scholarly journals Cavity nano-optomechanics: a nanomechanical system in a high finesse optical cavity

2010 ◽  
Author(s):  
Sebastian Stapfner ◽  
Ivan Favero ◽  
David Hunger ◽  
Philipp Paulitschke ◽  
Jakob Reichel ◽  
...  
Keyword(s):  
Optical Cavity ◽  
High Finesse

Quantum secret sharing protocol based on four-dimensional three-particle entangled states

2016 ◽  
Vol 30 (02) ◽  
pp. 1550267 ◽  
Author(s):  
Yi Xiang ◽  
Zhi Wen Mo
Keyword(s):  
Hilbert Space ◽  
Secret Sharing ◽  
Single Particle ◽  
High Efficiency ◽  
Quantum Secret Sharing ◽  
Entangled States ◽  
Secret Key ◽  
Particle Measurements ◽  
Eavesdropping Attack ◽  
Dimensional Hilbert Space

In this paper, we proposed a three-party quantum secret sharing (QSS) scheme using four-dimensional three-particle entangled states. In this QSS scheme, each agent can obtain a shadow of the secret key by performing single-particle measurements. Compared with the existing QSS protocol, this scheme has high efficiency and can resist the eavesdropping attack and entangle-measuring attack, which using three-particle entangled states are based on four-dimensional Hilbert space.

Generation of four-photon polarization entangled states with cross-Kerr nonlinearity

2015 ◽  
Vol 13 (05) ◽  
pp. 1550024 ◽  
Author(s):  
Meiyu Wang ◽  
Fengli Yan
Keyword(s):  
Kerr Nonlinearity ◽  
Entangled States ◽  
Entangled State ◽  
Kerr Medium ◽  
Coherent Light ◽  
Photon Polarization ◽  
Beam Splitters ◽  
Ghz States ◽  
Different Types ◽  
Quantum Optical

We show how to prepare three different types of four-photon polarization entangled states among four modes. The scheme only use cross-Kerr medium, polarization beam splitters and X homodyne measurements on coherent light fields, which can be efficiently implemented in quantum optical laboratories. GHZ states and symmetric Dick states can be generated in deterministic way based on the scheme. With the possible availability of suitable strong Kerr nonlinearity, another type of entangled state called genuine four-photon entangled state can be realized as well.

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