scholarly journals Eternally non-Markovian dynamics of a qubit interacting with a single-photon wavepacket

2021 ◽  
Author(s):  
Anita Dabrowska ◽  
Dariusz Chruscinski ◽  
Sagnik Chakraborty ◽  
Gniewomir Sarbicki
Keyword(s):  
Characteristic Feature ◽  
Wave Packet ◽  
Detailed Analysis ◽  
Single Photon ◽  
Level System ◽  
Resonant Case ◽  
Temporal Correlations ◽  
Input Field ◽  
Markovian Dynamics ◽  
Local Generator

Abstract An evolution of a two-level system (qubit) interacting with a single-photon wave packet is analyzed. It is shown that a hierarchy of master equations gives rise to phase covariant qubit evolution. The temporal correlations in the input field induce nontrivial memory effects for the evolution of a qubit. It is shown that in the resonant case whenever time-local generator is regular (does not display singularities) the qubit evolution never displays information backflow. However, in general the generator might be highly singular leading to intricate non-Markovian effects. A detailed analysis of the exponential profile is provided which allows to illustrate all characteristic feature of the qubit evolution.

scholarly journals Leggett-Garg Inequalities for Quantum Fluctuating Work

Entropy ◽  
2018 ◽  
Vol 20 (3) ◽  
pp. 200 ◽  
Author(s):  
◽  
Keyword(s):  
Quantum System ◽  
Quantum Correlations ◽  
Weak Measurement ◽  
Projective Measurement ◽  
Level System ◽  
Quantum Regime ◽  
Measurement Scheme ◽  
Temporal Correlations ◽  
Classical Thermodynamics ◽  
Work Done

The Leggett-Garg inequalities serve to test whether or not quantum correlations in time can be explained within a classical macrorealistic framework. We apply this test to thermodynamics and derive a set of Leggett-Garg inequalities for the statistics of fluctuating work done on a quantum system unitarily driven in time. It is shown that these inequalities can be violated in a driven two-level system, thereby demonstrating that there exists no general macrorealistic description of quantum work. These violations are shown to emerge within the standard Two-Projective-Measurement scheme as well as for alternative definitions of fluctuating work that are based on weak measurement. Our results elucidate the influences of temporal correlations on work extraction in the quantum regime and highlight a key difference between quantum and classical thermodynamics.

scholarly journals On-chip photonic transistor based on the spike synchronization in circuit QED

2018 ◽  
Vol 32 (08) ◽  
pp. 1850088 ◽  
Author(s):  
Yusuf Gül
Keyword(s):  
Single Photon ◽  
Impedance Matching ◽  
Normal Modes ◽  
Single Mode ◽  
Circuit Qed ◽  
Gain Enhancement ◽  
Input Field ◽  
Cavity System ◽  
Photon Conversion ◽  
On Chip

We consider the single photon transistor in coupled cavity system of resonators interacting with multilevel superconducting artificial atom simultaneously. Effective single mode transformation is used for the diagonalization of the Hamiltonian and impedance matching in terms of the normal modes. Storage and transmission of the incident field are described by the interactions between the cavities controlling the atomic transitions of lowest lying states. Rabi splitting of vacuum-induced multiphoton transitions is considered in input/output relations by the quadrature operators in the absence of the input field. Second-order coherence functions are employed to investigate the photon blockade and delocalization–localization transitions of cavity fields. Spontaneous virtual photon conversion into real photons is investigated in localized and oscillating regimes. Reflection and transmission of cavity output fields are investigated in the presence of the multilevel transitions. Accumulation and firing of the reflected and transmitted fields are used to investigate the synchronization of the bunching spike train of transmitted field and population imbalance of cavity fields. In the presence of single photon gate field, gain enhancement is explained for transmitted regime.

scholarly journals WAVE PACKETS AND QUANTUM OSCILLATIONS

2004 ◽  
Vol 19 (05) ◽  
pp. 677-694 ◽  
Author(s):  
STEFANO DE LEO ◽  
CELSO C. NISHI ◽  
PIETRO P. ROTELLI
Keyword(s):  
Wave Packet ◽  
Detailed Analysis ◽  
Wave Packets ◽  
Particle Creation ◽  
Quantum Oscillations ◽  
Standard Formula ◽  
Unknown Form

We give a detailed analysis of the oscillation formula within the context of the wave packet formalism. Particular attention is made to insure flavor eigenstate creation in the physical cases (Δp≠0). This requirement imposes noninstantaneous particle creation in all frames. It is shown that the standard formula is not only exact when the mass wave packets have the same velocity, but it is a good approximation when minimal slippage occurs. For more general situations the oscillation formula contains additional arbitrary parameters, which allows for the unknown form of the wave packet envelope.

scholarly journals Non-Markovian Dynamics of an Open Two-Level System with Amplitude-Phase Damping

2013 ◽  
Vol 03 (01) ◽  
pp. 27-33 ◽  
Author(s):  
Ning Tang ◽  
Guoyou Wang ◽  
Zilong Fan ◽  
Haosheng Zeng
Keyword(s):  
Level System ◽  
Phase Damping ◽  
Markovian Dynamics

Generation of single-photon and two-photon pulses from a quantum two-level system (Conference Presentation)

2019 ◽  
Author(s):  
Lukas Hanschke ◽  
Kevin A. Fischer ◽  
Jakob Wierzbowski ◽  
Stefan Appel ◽  
Daniil Lukin ◽  
...  
Keyword(s):  
Single Photon ◽  
Level System ◽  
Two Photon
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