Preliminary progress of the state preparation with a new optical pumping method in a cesium atomic fountain clock

2021 ◽  
Author(s):  
Lei Han ◽  
Fang Fang ◽  
Yani Zuo ◽  
Fasong Zheng ◽  
Weiliang Chen ◽  
...  
Keyword(s):  
Optical Pumping ◽  
The State ◽  
State Preparation ◽  
Atomic Fountain

scholarly journals Self-consistent tomography and measurement-device independent cryptography

2020 ◽  
pp. 2040003
Author(s):  
I. D. Moore ◽  
S. J. van Enk
Keyword(s):  
Quantum Mechanics ◽  
Quantum System ◽  
The State ◽  
Correlated Errors ◽  
Measurement Device ◽  
State Preparation ◽  
Self Consistent ◽  
Average State ◽  
Measurement Device Independent ◽  
Joint State

A recurring problem in quantum mechanics is to estimate either the state of a quantum system or the measurement operator applied to it. If we wish to estimate both, then the difficulty is that the state and the measurement always appear together: to estimate the state, we must use a measurement; to estimate the measurement operator, we must use a state. The data of such quantum estimation experiments come in the form of measurement frequencies. Ideally, the measured average frequencies can be attributed to an average state and an average measurement operator. If this is not the case, we have correlated state-preparation-and-measurement (SPAM) errors. We extend some tests developed to detect such correlated errors to apply to a cryptographic scenario in which two parties trust their individual states but not the measurement performed on the joint state.

COLLECTIVE REMOTE STATE PREPARATION

2008 ◽  
Vol 06 (05) ◽  
pp. 1051-1066 ◽  
Author(s):  
NGUYEN BA AN ◽  
JAEWAN KIM
Keyword(s):  
Success Probability ◽  
The State ◽  
Remote State Preparation ◽  
The Other ◽  
Quantum Circuits ◽  
State Preparation ◽  
Remote Location ◽  
Simple Quantum ◽  
Classical Knowledge ◽  
Analytical Expressions

We show that any M ≥ 2 distant parties who independently share the complete classical knowledge of a secret qubit state can collectively prepare the state at another remote location. Two distinct schemes for such a task are proposed: one via a single (M + 1)-partite GHZ-type state and the other via M EPR-type pairs. Analytical expressions of the total success probability are derived explicitly for both the schemes. Of interest is the M-dependence of both the success probability and the receiver's action. We also construct simple quantum circuits for the two-qubit operators whose execution is necessary to accomplish the schemes.

State Preparation in a Cold Atom Clock by Optical Pumping

2017 ◽  
Vol 34 (7) ◽  
pp. 073201 ◽  
Author(s):  
Yu-Xiong Duan ◽  
Bin Wang ◽  
Jing-Feng Xiang ◽  
Qian Liu ◽  
Qiu-Zhi Qu ◽  
...  
Keyword(s):  
Optical Pumping ◽  
Cold Atom ◽  
State Preparation

scholarly journals Nonmaximal Entanglement Can Make Joint Remote State Preparation Absolutely Secure

2013 ◽  
Vol 23 (2) ◽  
pp. 97
Author(s):  
Cao Thi Bich ◽  
Nguyen Ba An
Keyword(s):  
Quantum State ◽  
Quantum Channel ◽  
The State ◽  
Remote State Preparation ◽  
Entangled States ◽  
Joint Remote State Preparation ◽  
State Preparation ◽  
Quantum Task

Joint remote state preparation is a multiparty global quantum task in which several parties are assigned to jointly prepare a quantum state for a remote party. Although various protocols have been proposed so far, none of them are absolutely secure in the sense that the legitimate parties (the preparers plus the receiver) can by no means identify the state to be prepared even if they all collude with each other. Here we resolve this drawback by employing the quantum channel in terms of nonmaximally entangled states whose parameters are kept secret to all the participants but used to split the information in a judicious way so that not only absolute security in the above-mentioned sense is achieved but also the performance is the simplest possible.

scholarly journals State preparation by optical pumping in erbium-doped solids using stimulated emission and spin mixing

2008 ◽  
Vol 78 (4) ◽  
Author(s):  
B. Lauritzen ◽  
S. R. Hastings-Simon ◽  
H. de Riedmatten ◽  
M. Afzelius ◽  
N. Gisin
Keyword(s):  
Optical Pumping ◽  
Stimulated Emission ◽  
State Preparation ◽  
Erbium Doped

Investigations of the optical state selection process with optical pumping in a cesium atomic fountain clock

2021 ◽  
Author(s):  
Lei Han ◽  
Fang Fang ◽  
Wei-Liang Chen ◽  
Kun Liu ◽  
Ya-Ni Zuo ◽  
...  
Keyword(s):  
Optical Pumping ◽  
Selection Process ◽  
Atomic Fountain ◽  
State Selection
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