Quantum optical feedback control for creating strong correlations in many-body systems

Mazzucchi, Gabriel; Caballero-Benítez, Santiago F.; Иванов, Д. А.; Mekhov, Igor B.

doi:10.1364/optica.3.001213

Cited by 31 publications

(36 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The applications can also include control schemes for optical information processing [99]. Experiments can be based on quantum many-body gases in a cavity [43][44][45][46][47]92], and circuit QED, where ultra-strong coupling has been obtained [61,62] or effective spins can be considered [59,60,74]. Feedback methods can be extended by,…”

mentioning

confidence: 99%

Feedback-Induced Quantum Phase Transitions Using Weak Measurements

et al. 2020

View full text Add to dashboard Cite

We show that applying feedback and weak measurements to a quantum system induces phase transitions beyond the dissipative ones. Feedback enables controlling essentially quantum properties of the transition, i.e., its critical exponent, as it is driven by the fundamental quantum fluctuations due to measurement. Feedback provides the non-Markovianity and nonlinearity to the hybrid quantumclassical system, and enables simulating effects similar to spin-bath problems and Floquet time crystals with tunable long-range (long-memory) interactions.

show abstract

mentioning

confidence: 99%

Feedback-Induced Quantum Phase Transitions Using Weak Measurements

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Instead of stabilizing on a constant mean intra-cavity photon number, the feedback scheme can be modified to modulate the atom-light coupling strength according to more complex schemes. Such control is important to engineer non-equilibrium phases and phase transitions [22,23,34,35].…”

Section: Discussionmentioning

confidence: 99%

Continuous feedback on a quantum gas coupled to an optical cavity

et al. 2020

View full text Add to dashboard Cite

We present an active feedback scheme acting continuously on the state of a quantum gas dispersively coupled to a high-finesse optical cavity. The quantum gas is subject to a transverse pump laser field inducing a self-organization phase transition, where the gas acquires a density modulation and photons are scattered into the resonator. Photons leaking from the cavity allow for a real-time and non-destructive readout of the system. We stabilize the mean intra-cavity photon number through a micro-processor controlled feedback architecture acting on the intensity of the transverse pump field. The feedback scheme can keep the mean intra-cavity photon number n ph constant, in a range between n ph =0.17(4) and n ph =27.6(5), and for up to 4 s. Thus we can engage the stabilization in a regime where the system is very close to criticality as well as deep in the self-organized phase. The presented scheme allows us to approach the self-organization phase transition in a highly controlled manner and is a first step on the path towards the realization of many-body phases driven by tailored feedback mechanisms.

show abstract

“…Here we use the term 'nondestructive' in the measurement of an observable of interestÂ such as a spin or an atom number in the sense that the probability distributions P a of measurement outcome a ofÂ are the same before and after the measurement [15]. An example of interesting quantum many-body dynamics is the quantum critical behavior of the Bose-Hubbard systems influenced by measurement backaction [16] and the creation of a strong correlation with feedback control [17]. From a technical viewpoint, realization of the nondestructive limit of quantum gas microscopy relaxes the crucial requirement of incorporating an elaborate cooling scheme for an extremely deep optical lattice depth.…”

Section: Introductionmentioning

confidence: 99%

Schemes for nondestructive quantum gas microscopy of single atoms in an optical lattice

et al. 2020

View full text Add to dashboard Cite

We propose a quantum gas microscope for ultracold atoms that enables nondestructive atom detection, thus evading higher-band excitation and change of the internal degrees of freedom. We show that photon absorption of a probe beam cannot be ignored even in dispersive detection to obtain a signal-to-noise ratio greater than unity because of the shot noise of the probe beam under a standard measurement condition. The first scheme we consider for the nondestructive detection, applicable to an atom that has an electronic ground state without spin degrees of freedom, is to utilize a magicwavelength condition of the optical lattice for the transition for probing. The second is based on the dispersive Faraday effect and squeezed quantum noise and is applicable to an atom with spins in the ground state. In this second scheme, a scanning microscope is adopted to exploit the squeezed state and reduce the effective losses. Application to ultracold ytterbium atoms is discussed.

show abstract

Quantum optical feedback control for creating strong correlations in many-body systems

Cited by 31 publications

References 65 publications

Feedback-Induced Quantum Phase Transitions Using Weak Measurements

Feedback-Induced Quantum Phase Transitions Using Weak Measurements

Continuous feedback on a quantum gas coupled to an optical cavity

Schemes for nondestructive quantum gas microscopy of single atoms in an optical lattice

Contact Info

Product

Resources

About