Abstract:Quantum technology resorts to efficient utilization of quantum resources to realize technique innovation. The systems are controlled such that their states follow the desired manners to realize different quantum protocols. However, the decoherence caused by the system-environment interactions causes the states deviating from the desired manners. How to protect quantum resources under the coexistence of active control and passive decoherence is of significance. Recent studies have revealed that the decoherence … Show more
“…Furthermore, the presence of Fe 2+ in the cathode chamber was confirmed using the phosphoric acid masking -potassium ferricyanide coloring method. [43] K 3 Fe(CN) 6 was employed to rapidly form Teng's blue precipitate upon reaction with Fe 2+ . H 3 PO 4 was added to the solutions before and after the photoreaction to promote the formation of a colorless complex between Fe 3+ and H 3 PO 4 , thereby eliminating interference from Fe 3+ .…”
The efficient utilization of solar energy in battery systems has emerged as a crucial strategy for promoting green and sustainable development. In this study, an innovative dual‐photoelectrode vanadium–iron energy storage battery (Titanium dioxide (TiO2) or Bismuth vanadate (BiVO4) as photoanodes, polythiophene (pTTh) as photocathode, and VO2+/Fe3+ as redox couples.) is proposed, which can autonomously charge under sunlight. The dual‐photoelectrode structure enables the efficient harnessing of solar energy. All processes are spontaneous and do not require external power sources. It is noteworthy that the vanadium–iron energy storage battery demonstrates excellent stability and remarkably low cost. The results show that the combinations of TiO2‐pTTh and BiVO4‐pTTh as photoelectrodes achieve spontaneous conversion rates of 29.17% and 25.46% for VO2+ and 25.6% and 23% for Fe3+ after 4 h of light charging. This study offers a promising solution for the development of large‐scale, low‐cost solar energy storage batteries.
“…Furthermore, the presence of Fe 2+ in the cathode chamber was confirmed using the phosphoric acid masking -potassium ferricyanide coloring method. [43] K 3 Fe(CN) 6 was employed to rapidly form Teng's blue precipitate upon reaction with Fe 2+ . H 3 PO 4 was added to the solutions before and after the photoreaction to promote the formation of a colorless complex between Fe 3+ and H 3 PO 4 , thereby eliminating interference from Fe 3+ .…”
The efficient utilization of solar energy in battery systems has emerged as a crucial strategy for promoting green and sustainable development. In this study, an innovative dual‐photoelectrode vanadium–iron energy storage battery (Titanium dioxide (TiO2) or Bismuth vanadate (BiVO4) as photoanodes, polythiophene (pTTh) as photocathode, and VO2+/Fe3+ as redox couples.) is proposed, which can autonomously charge under sunlight. The dual‐photoelectrode structure enables the efficient harnessing of solar energy. All processes are spontaneous and do not require external power sources. It is noteworthy that the vanadium–iron energy storage battery demonstrates excellent stability and remarkably low cost. The results show that the combinations of TiO2‐pTTh and BiVO4‐pTTh as photoelectrodes achieve spontaneous conversion rates of 29.17% and 25.46% for VO2+ and 25.6% and 23% for Fe3+ after 4 h of light charging. This study offers a promising solution for the development of large‐scale, low‐cost solar energy storage batteries.
“…On the other hand, driven-dissipative quantum systems have recently attracted intensive research interests, particularly in the context of quantum control (for a very recent, comprehensive review, the reader is referred to Ref. 64 ). Generally, the steady state of such systems can be far from equilibrium because of the unavoidable competition between driving and dissipation.…”
We propose an experimentally feasible optomechanical scheme to realize a negative cavity photon spectral function (CPSF). The system under consideration is an optomechanical system (OMS) consisting of two mechanical (phononic) modes which are linearly coupled to a common cavity mode via the radiation pressure while parametrically driven through the coherent time-modulation of their spring coefficients. We find that, in the red-detuned and weak-coupling regimes, a frequency-dependent effective cavity damping rate (ECDR) is induced in the system. Furthermore, using the equations of motion for the cavity retarded Green's function obtained in the framework of a generalized linear response theory (GLRT), we show that a negative ECDR corresponding to a negative CPSF can be realized by controlling the cooperativities and modulation parameters while the system still remains in the stable regime. Nevertheless, such a negativity never occurs in a standard cavity optomechanical system. Besides, we find that the presence of two modulated mechanical degrees of freedom provides more controllability on the negativity of CPSF with a smaller parametric drive in comparison to the setup with a single modulated mechanical oscillator (MO). Interestingly, the introduced negativity may open a new platform to realize an extraordinary (modified) optomechanically induced transparency (OMIT) leading to perfect tunable optomechanical filters, and a negative effective temperature (NET) corresponding, respectively, to the probe reflection above the unity and the coupled qubit-cavity population inversion.
“…Other than the above-listed protocols, it has also long been confirmed that temporal periodic driving on the open system can impose significant effects on the system dynamics [36][37][38][39][40][41][42]. Some methods of dealing with this problem, e.g., spectral filtering theory [43][44][45][46][47] and those based on the Floquet theory [48][49][50], have also been developed. Different from the bound states generated in the time-independent system, e.g., the impurity system in the solid system, the bound states generated by temporal periodic driving fields are time-dependent and are dubbed as Floquet bound states [48][49][50].…”
Section: Introductionmentioning
confidence: 99%
“…Some methods of dealing with this problem, e.g., spectral filtering theory [43][44][45][46][47] and those based on the Floquet theory [48][49][50], have also been developed. Different from the bound states generated in the time-independent system, e.g., the impurity system in the solid system, the bound states generated by temporal periodic driving fields are time-dependent and are dubbed as Floquet bound states [48][49][50]. The conditions for their formation as well as their applications in the quantum information technologies are also discussed [48,50].…”
Section: Introductionmentioning
confidence: 99%
“…In this work, we shall analyze the influences of the driving field and propose the potential application of the driving based on the numerical results and theoretical analysis. The framework is based on the picture of energy transfer and renormalization effect originating from the driving field, which is different from those based on the Floquet theory [41,[48][49][50]. The paper is organized as follows.…”
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