scholarly journals Teleportation of atomic states via cavity QED for a cavity prepared in a superposition of zero and one Fock states

2006 ◽  
Vol 53 (7) ◽  
pp. 883-906 ◽  
Author(s):  
E. S. Guerra
Keyword(s):  
Cavity Qed ◽  
Fock States ◽  
Atomic States

A SCHEME FOR IMPLEMENTATION OF DENSE CODING WITH W-CLASS STATES IN CAVITY QED

2009 ◽  
Vol 07 (01) ◽  
pp. 307-312 ◽  
Author(s):  
LIU YE ◽  
JUAN HE
Keyword(s):  
Cavity Qed ◽  
Cavity Mode ◽  
Dense Coding ◽  
Cavity Field ◽  
Quantum Dense Coding ◽  
Atomic States

An experimentally feasible scheme for implementing quantum dense coding in cavity QED is proposed. In the scheme a W-class state can first be prepared by letting the atoms interact simultaneously with a highly detuned cavity mode. Then the states coded on this W-class state can be exactly distinguished by detecting atomic states. The scheme is insensitive to the cavity field, and the quantum dense coding can be realized in a simple way.

EFFICIENT SCHEME FOR TELEPORTATION OF UNKNOWN ATOMIC STATES USING NON-MAXIMALLY ENTANGLED STATES

2007 ◽  
Vol 21 (15) ◽  
pp. 923-927
Author(s):  
KUANG-WEI XIONG
Keyword(s):  
Cavity Qed ◽  
Bell State ◽  
Atomic State ◽  
Entangled States ◽  
Distinct Advantage ◽  
State Measurement ◽  
Cavity Decay ◽  
Efficient Scheme ◽  
Maximally Entangled States ◽  
Atomic States

We propose a feasible scheme for teleporting an unknown atomic state by using non-maximally entangled states in cavity QED. The distinct advantage of the scheme is that, not only can the teleportation and distillation procedure be realized simultaneously, but the scheme is also insensitive to the cavity decay and thermal field with the assistance of a strong classical driving field. In addition, the joint Bell-state measurement can be distinguished via detecting the atomic state.

Sequential phonon measurements of atomic motion

2021 ◽  
Author(s):  
Atirach Ritboon ◽  
Lukáš Slodička ◽  
Radim Filip
Keyword(s):  
Cavity Qed ◽  
Quantum Fisher Information ◽  
Atomic Motion ◽  
Circuit Qed ◽  
Fock States ◽  
Fock State ◽  
Atomic Vibrations ◽  
State Generation ◽  
Available Information ◽  
Mechanical Sensing

Abstract The motion of trapped atoms plays an essential role in quantum mechanical sensing, simulations and computing. Small disturbances of atomic vibrations are still challenging to be sensitively detected. It requires a reliable coupling between individual phonons and internal electronic levels that light can readout. As available information in a few electronic levels about the phonons is limited, the coupling needs to be sequentially repeated to further harvest the remaining information. We analyze such phonon measurements on the simplest example of the force and heating sensing using motional Fock states. We prove that two sequential measurements are sufficient to reach sensitivity to force and heating for realistic Fock states and saturate the quantum Fisher information for a small amount of force or heating. It is achieved by the conventionally available Jaynes-Cummings coupling. The achieved sensitivities are found to be better than those obtained from classical states. Further enhancements are expectable when the higher Fock state generation is improved. The result opens additional applications of sequential phonon measurements of atomic motion. This measurement scheme can also be directly applied to other bosonic systems including cavity QED and circuit QED.

Generation of squeezed atomic states in cavity QED

Pramana ◽  
1998 ◽  
Vol 50 (3) ◽  
pp. 253-261
Author(s):  
Aditi Ray ◽  
R R Puri
Keyword(s):  
Cavity Qed ◽  
Atomic States

REMOTE FIELD AND ATOMIC STATE PREPARATION

2008 ◽  
Vol 06 (02) ◽  
pp. 393-402 ◽  
Author(s):  
RAMEEZ-UL- ISLAM ◽  
MANZOOR IKRAM ◽  
ASHFAQ H. KHOSA ◽  
FARHAN SAIF
Keyword(s):  
Cavity Qed ◽  
Success Probability ◽  
Classical Field ◽  
Atomic State ◽  
Entangled State ◽  
High Fidelity ◽  
Classical Communication ◽  
Protocol Execution ◽  
Remote Preparation ◽  
Atomic States

A scheme for remote preparation of field (atomic) states is proposed. Protocol execution requires cavity QED based atom-field interactions successively supplemented with Ramsey interferometry. The state to be remotely prepared at the receiver's end is acquired by deterministically manipulating the sender's component of the pre-shared entangled state. In the case of field entanglement, it is carried out with the help of an atom that passes through the sender's cavity and then traverses a classical external field for specified times prior to detection. However, for atomic entangled states, only interactions with the classical field suffice to complete the task. The scheme guarantees good success probability with high fidelity and requires one bit of classical communication.

scholarly journals SCHEME FOR BELL-STATE-MEASUREMENT-FREE QUANTUM TELEPORTATION

2006 ◽  
Vol 04 (02) ◽  
pp. 341-346 ◽  
Author(s):  
MING YANG ◽  
ZHUO-LIANG CAO
Keyword(s):  
Quantum Teleportation ◽  
Cavity Qed ◽  
Thermal Field ◽  
Success Probability ◽  
Bell State ◽  
Bell State Measurement ◽  
State Measurement ◽  
Cavity Decay ◽  
Atomic States

A teleportation scheme for unknown atomic states is proposed in cavity QED. The Bell state measurement is not needed in the teleportation process, and the success probability can reach 1.0. In addition, the current scheme is insensitive to the cavity decay and thermal field.

scholarly journals Weakly invasive metrology: quantum advantage and physical implementations

Quantum ◽  
2021 ◽  
Vol 5 ◽  
pp. 446
Author(s):  
M. Perarnau-Llobet ◽  
D. Malz ◽  
J. I. Cirac
Keyword(s):  
Cavity Qed ◽  
Coherent States ◽  
Unknown Parameter ◽  
Quantum States ◽  
Atomic Ensembles ◽  
Fixed Rate ◽  
Fock States ◽  
Hamiltonian Parameter ◽  
Photonic States

We consider the estimation of a Hamiltonian parameter of a set of highly photosensitive samples, which are damaged after a few photons Nabs are absorbed, for a total time T. The samples are modelled as a two mode photonic system, where photons simultaneously acquire information on the unknown parameter and are absorbed at a fixed rate. We show that arbitrarily intense coherent states can obtain information at a rate that scales at most linearly with Nabs and T, whereas quantum states with finite intensity can overcome this bound. We characterise the quantum advantage as a function of Nabs and T, as well as its robustness to imperfections (non-ideal detectors, finite preparation and measurement rates for quantum photonic states). We discuss an implementation in cavity QED, where Fock states are both prepared and measured by coupling atomic ensembles to the cavities. We show that superradiance, arising due to a collective coupling between the cavities and the atoms, can be exploited for improving the speed and efficiency of the measurement.

Sign in / Sign up

Export Citation Format

Share Document