scholarly journals The creation and detection of arbitrary photon number states using cavity QED

2004 ◽  
Vol 6 ◽  
pp. 97-97 ◽  
Author(s):  
Benjamin T H Varcoe ◽  
Simon Brattke ◽  
Herbert Walther
Keyword(s):  
Cavity Qed ◽  
Photon Number ◽  
The Creation

DYNAMIC PROPERTIES OF THE LARGE-DETUNING CAVITY QED SYSTEM IN THE PRESENCE OF CAVITY DECAY

2008 ◽  
Vol 22 (26) ◽  
pp. 2561-2570
Author(s):  
CHENG-YUAN GAO ◽  
LEI MA ◽  
JIN-MING LIU
Keyword(s):  
Cavity Qed ◽  
Dynamic Properties ◽  
Photon Number ◽  
Quantum Phase Gate ◽  
Cavity Decay ◽  
Phase Gate ◽  
Physical Quantities ◽  
Population Probability ◽  
Average Photon Number ◽  
Epr State

We consider a physical process of two Λ-type three-level atoms interacting with a bimodal cavity including the influence of the cavity decay. We analyze the influence of cavity decay on several physical quantities of the process, such as atomic population probability, residual entanglement, concurrence of two atoms, average population inversion, average photon number, the fidelity for quantum phase gate, and the fidelity of generating atomic EPR state. It is found that all of these physical quantities decrease with the increase of cavity decay when the other relevant parameters are fixed.

"Seeking the Light in a Cavity" in Conversation with Nobel Laureate Serge Haroche

2014 ◽  
Vol 03 (02) ◽  
pp. 12-14
Author(s):  
Michael Good ◽  
Wei Liang Quek
Keyword(s):  
Cavity Qed ◽  
Quantum Physics ◽  
Photon Number ◽  
Nobel Laureate ◽  
Experimental Methods ◽  
Quantum Systems ◽  
Asia Pacific ◽  
Editorial Team ◽  
Collège De France ◽  
Quantum Feedback

Serge Haroche, Chair in Quantum Physics at the College de France. Professor Haroche was awarded the 2012 Nobel Prize for Physics for "groundbreaking experimental methods that enable measuring and manipulation of individual quantum systems". On 22 April 2013, the first day of the Berge Fest Conference, Professor Haroche delivered a talk on "Controlling photons in cavities". He reviewed recent experiments in Cavity QED in which his group count trapped microwave photons non-destructively and used quantum feedback methods to stabilize the photon number to a preset value. Further developments of these experiments were also discussed in his talk. The editorial team of Asia Pacific Physics Newsletter interviewed Professor Haroche during the Berge Fest Conference on 24 April 2014. For more information of the Berge Fest Conference, please visit http://bergefest.quantumlah.org/

DISCRIMINATING 16 MUTUALLY ORTHOGONAL 4-ATOM CLUSTER STATES VIA CAVITY QED IN TELEPORTING ARBITRARY UNKNOWN TWO-ATOM STATE WITH A 4-ATOM CLUSTER STATE AS QUANTUM CHANNEL

2008 ◽  
Vol 19 (05) ◽  
pp. 741-747 ◽  
Author(s):  
WEN ZHANG ◽  
YI-MIN LIU ◽  
ZHANG-YIN WANG ◽  
ZHAN-JUN ZHANG
Keyword(s):  
Quantum Channel ◽  
Cavity Qed ◽  
Thermal Field ◽  
Cluster State ◽  
Photon Number ◽  
Effective Hamiltonian ◽  
Cluster States ◽  
Present Scheme ◽  
Atom Cluster ◽  
Cavity Decay

We propose a scheme for discriminating 16 mutually orthogonal 4-atom cluster entangled states (CES) via cavity QED in teleporting an arbitrary unknown two-atom state with a 4-atom CES as quantum channel. Utilizing the interaction of atoms with cavity and classical field, the complicated 4-atom CESs are transformed into the simple 4-atom product states. Hence the difficulty of measurement during the teleportation process is degraded. In the present scheme, we allow for the case of a strong classical driving field and the detuning between the atoms and the cavity is assumed large enough. Thereby the photon-number-dependent parts in the effective Hamiltonian can be neglected, and the scheme is insensitive to both the cavity decay and the thermal field.

scholarly journals Schrödinger cat states in circuit QED

2019 ◽  
pp. 402-427
Author(s):  
Steven M. Girvin
Keyword(s):  
Quantum Optics ◽  
Error Correction ◽  
Cavity Qed ◽  
Photon Number ◽  
Quantum Error Correction ◽  
Circuit Qed ◽  
Schrödinger Cat ◽  
Microwave Regime ◽  
Cat States ◽  
Quantum Error

Circuit quantum electrodynamics (‘circuit QED’) describes the quantum mechanics and quantum optics of superconducting electrical circuits operating in the microwave regime near absolute zero temperature. It is the analog of cavity QED in quantum optics with the role of the atoms being played by superconducting qubits. The present lecture notes present a brief overview of circuit QED and then focus on some of the novel quantum states that can be produced and measured (via photon number parity and the Wigner function) using the strong coupling between an artificial atom and one or more cavities. Of particular importance are Schrödinger cat states of photons. Despite long being considered exemplars of frail quantum superpositions that quickly decohere, such states have recently been used as the basis for quantum error correction codes which have reached the long-sought goal of enhancing the lifetime of quantum information through active quantum error correction.

EFFICIENT TELEPORTATION OF UNKNOWN ATOMIC ENTANGLED STATES

2006 ◽  
Vol 04 (04) ◽  
pp. 627-631 ◽  
Author(s):  
YAN ZHAO ◽  
MING YANG ◽  
ZHUO-LIANG CAO
Keyword(s):  
Cavity Qed ◽  
Thermal Field ◽  
Photon Number ◽  
Success Probability ◽  
Bell State ◽  
Classical Field ◽  
Entangled States ◽  
Effective Hamiltonian ◽  
State Measurement ◽  
Cavity Decay

We propose a scheme for teleporting unknown atomic entangled states in cavity QED. With the assistance of a strong classical field, the photon number dependent parts in the effective Hamiltonian are canceled. Thus, the scheme is insensitive to both the cavity decay and the thermal field. In addition, our scheme does not require the Bell-state measurement directly and the success probability can reach 1.0 in our scheme.

scholarly journals Manifestation of the Purcell Effect in Current Transport through a Dot–Cavity–QED System

Nanomaterials ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 1023 ◽  
Author(s):  
Nzar Rauf Abdullah ◽  
Chi-Shung Tang ◽  
Andrei Manolescu ◽  
Vidar Gudmundsson
Keyword(s):  
Cavity Qed ◽  
Photon Number ◽  
Far Infrared ◽  
Purcell Effect ◽  
Photon Polarization ◽  
Resonant States ◽  
The Mean ◽  
Dimensional Electron Gas ◽  
Electron Photon ◽  
Photon Coupling

We study the transport properties of a wire-dot system coupled to a cavity and a photon reservoir. The system is considered to be microstructured from a two-dimensional electron gas in a GaAs heterostructure. The 3D photon cavity is active in the far-infrared or the terahertz regime. Tuning the photon energy, Rabi-resonant states emerge and in turn resonant current peaks are observed. We demonstrate the effects of the cavity–photon reservoir coupling, the mean photon number in the reservoir, the electron–photon coupling and the photon polarization on the intraband transitions occurring between the Rabi-resonant states, and on the corresponding resonant current peaks. The Rabi-splitting can be controlled by the photon polarization and the electron–photon coupling strength. In the selected range of the parameters, the electron–photon coupling and the cavity-environment coupling strengths, we observe the results of the Purcell effect enhancing the current peaks through the cavity by increasing the cavity–reservoir coupling, while they decrease with increasing electron–photon coupling. In addition, the resonant current peaks are also sensitive to the mean number of photons in the reservoir.

The Measurement of Photon Number States Using Cavity QED

2001 ◽  
pp. 419-426
Author(s):  
Simon Brattke ◽  
Benjamin Varcoe ◽  
Herbert Walther
Keyword(s):  
Cavity Qed ◽  
Photon Number

The role of affect in feelings of obligation

2020 ◽  
Vol 43 ◽  
Author(s):  
Stefen Beeler-Duden ◽  
Meltem Yucel ◽  
Amrisha Vaish
Keyword(s):  
Positive Emotions ◽  
The Creation ◽  
Sense Of Obligation

Abstract Tomasello offers a compelling account of the emergence of humans’ sense of obligation. We suggest that more needs to be said about the role of affect in the creation of obligations. We also argue that positive emotions such as gratitude evolved to encourage individuals to fulfill cooperative obligations without the negative quality that Tomasello proposes is inherent in obligations.

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