CONTINUOUS VARIABLE TELEPORTATION OF QUANTUM FIELDS

2005 ◽  
Vol 03 (supp01) ◽  
pp. 11-25 ◽  
Author(s):  
H. J. CARMICHAEL
Keyword(s):  
Single Mode ◽  
Continuous Variable ◽  
Quantum States ◽  
Single Atom ◽  
Quantum Trajectory ◽  
Resonance Fluorescence ◽  
Quantum Fields ◽  
Continuous Measurements ◽  
Continuous Displacement ◽  
Inputs And Outputs

A quantum trajectory formulation of broadband continuous variable teleportation is developed. Inputs and outputs are quasi-monochromatic quantum fields rather than single-mode quantum states. The formalism accounts for the continuous measurements of Alice and Victor and continuous displacement of the teleported field by Bob. It is applied to the teleportation of the Mollow spectrum and photon antibunching in single-atom resonance fluorescence.

TELEPORTATION OF ANY FORM OF SINGLE-MODE QUANTUM STATES

2006 ◽  
Vol 20 (02n03) ◽  
pp. 97-103
Author(s):  
TONG-QIANG SONG
Keyword(s):  
Quantum Channel ◽  
Quantum Teleportation ◽  
Single Mode ◽  
Continuous Variable ◽  
Quantum States ◽  
Squeezed Vacuum ◽  
Einstein Podolsky Rosen ◽  
Epr Pair

By using the two-mode Einstein–Podolsky–Rosen (EPR) pair eigenstates or the two-mode squeezed vacuum as quantum channel we study the quantum teleportation of any form of single-mode quantum states (which include discrete and continuous variable quantum states). The elegant properties of the EPR pair eigenstates bring much convenience to our discussion.

scholarly journals Joint measurement of complementary observables in moment tomography

2017 ◽  
Vol 15 (08) ◽  
pp. 1740002
Author(s):  
Yong Siah Teo ◽  
Christian R. Müller ◽  
Hyunseok Jeong ◽  
Zdeněk Hradil ◽  
Jaroslav Řeháček ◽  
...  
Keyword(s):  
Quantum Information ◽  
General Theory ◽  
Single Mode ◽  
Continuous Variable ◽  
Quantum States ◽  
The Other ◽  
Joint Measurement ◽  
Other Hand ◽  
Sampling Procedures ◽  
Parameter Reconstruction

Wigner and Husimi quasi-distributions, owing to their functional regularity, give the two archetypal and equivalent representations of all observable-parameters in continuous-variable quantum information. Balanced homodyning (HOM) and heterodyning (HET) that correspond to their associated sampling procedures, on the other hand, fare very differently concerning their state or parameter reconstruction accuracies. We present a general theory of a now-known fact that HET can be tomographically more powerful than balanced homodyning to many interesting classes of single-mode quantum states, and discuss the treatment for two-mode sources.

Quantum dialogue protocol with four-mode continuous variable GHZ state

2019 ◽  
Vol 33 (05) ◽  
pp. 1950033 ◽  
Author(s):  
Ming-Hui Zhang ◽  
Jin-Ye Peng ◽  
Zheng-Wen Cao
Keyword(s):  
Channel Capacity ◽  
Quantum Channel ◽  
Beam Splitter ◽  
Information Leakage ◽  
Continuous Variable ◽  
Ghz State ◽  
Quantum States ◽  
Quantum Dialogue ◽  
Discrete Variable ◽  
Secret Information

Quantum dialogue can realize the mutual transmission of secret information between two legal users. In most of the existing quantum dialogue protocols, the information carriers applied in quantum dialogue are discrete variable (DV) quantum states. However, there are certain limitations on the preparation and detection of DV quantum states with current techniques. Continuous variable (CV) quantum states can overcome these problems effectively while improving the quantum channel capacity. In this paper, we propose a quantum dialogue protocol with four-mode continuous variable GHZ state. Compared with the existing CV-based quantum dialogue protocols, the protocol allows two users to transmit two groups of secret information with different lengths to each other simultaneously. The channel capacity of the protocol has been improved as each traveling mode carries two- or four-bits of information. In addition, the protocol has been proved to be secure against information leakage problem and some common attacks, such as beam splitter attack and intercept-and-resend attack.

A method for efficiently estimating non-Gaussianity of continuous-variable quantum states

2020 ◽  
Vol 74 (1) ◽  
Author(s):  
Shao-Hua Xiang ◽  
Yu-Jing Zhao ◽  
Cheng Xiang ◽  
Wei Wen ◽  
Xue-Wen Long
Keyword(s):  
Continuous Variable ◽  
Quantum States

scholarly journals Photon Enhanced Interaction and Entanglement in Semiconductor Position-Based Qubits

2019 ◽  
Vol 9 (21) ◽  
pp. 4534 ◽  
Author(s):  
Panagiotis Giounanlis ◽  
Elena Blokhina ◽  
Dirk Leipold ◽  
Robert Staszewski
Keyword(s):  
Potential Energy ◽  
Entanglement Entropy ◽  
Electrostatic Actuation ◽  
Quantum States ◽  
Quantum Trajectory ◽  
Energy Profiles ◽  
Si Quantum Dot ◽  
And Control ◽  
Potential Energy Profiles ◽  
External Driving

CMOS technologies facilitate the possibility of implementing quantum logic in silicon. In this work, we discuss a minimalistic modelling of entangled photon communication in semiconductor qubits. We demonstrate that electrostatic actuation is sufficient to construct and control desired potential energy profiles along a Si quantum dot (QD) structure allowing the formation of position-based qubits. We further discuss a basic mathematical formalism to define the position-based qubits and their evolution under the presence of external driving fields. Then, based on Jaynes–Cummings–Hubbard formalism, we expand the model to include the description of the position-based qubits involving four energy states coupled with a cavity. We proceed with showing an anti-correlation between the various quantum states. Moreover, we simulate an example of a quantum trajectory as a result of transitions between the quantum states and we plot the emitted/absorbed photos in the system with time. Lastly, we examine the system of two coupled position-based qubits via a waveguide. We demonstrate a mechanism to achieve a dynamic interchange of information between these qubits over larger distances, exploiting both an electrostatic actuation/control of qubits and their photon communication. We define the entanglement entropy between two qubits and we find that their quantum states are in principle entangled.

scholarly journals Intensity-Field Correlation of Single-Atom Resonance Fluorescence

2009 ◽  
Vol 102 (18) ◽  
Author(s):  
S. Gerber ◽  
D. Rotter ◽  
L. Slodička ◽  
J. Eschner ◽  
H. J. Carmichael ◽  
...  
Keyword(s):  
Single Atom ◽  
Resonance Fluorescence ◽  
Intensity Field ◽  
Field Correlation
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