Stabilizing two-qubit entanglement by mimicking a squeezed environment

Govia, Luke C. G.; Lingenfelter, Andrew; Clerk, Aashish A.

doi:10.1103/physrevresearch.4.023010

Cited by 17 publications

(5 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The studied physics also applies to other implementations, e.g., based on atomic scatterers or mechanically modulated devices. Our result adds to the growing interest of time-modulated qubits and interactions that have, e.g., been suggested for faster 2-qubit gate implementations 39 , entanglement stabilization 40 and already been used for controlled photon release in photonic cluster state generation 41 .…”

Section: Discussionmentioning

confidence: 67%

Tunable directional photon scattering from a pair of superconducting qubits

Poshakinskiy

Sett

et al. 2023

Nat Commun

View full text Add to dashboard Cite

The ability to control the direction of scattered light is crucial to provide flexibility and scalability for a wide range of on-chip applications, such as integrated photonics, quantum information processing, and nonlinear optics. Tunable directionality can be achieved by applying external magnetic fields that modify optical selection rules, by using nonlinear effects, or interactions with vibrations. However, these approaches are less suitable to control microwave photon propagation inside integrated superconducting quantum devices. Here, we demonstrate on-demand tunable directional scattering based on two periodically modulated transmon qubits coupled to a transmission line at a fixed distance. By changing the relative phase between the modulation tones, we realize unidirectional forward or backward photon scattering. Such an in-situ switchable mirror represents a versatile tool for intra- and inter-chip microwave photonic processors. In the future, a lattice of qubits can be used to realize topological circuits that exhibit strong nonreciprocity or chirality.

show abstract

Section: Discussionmentioning

confidence: 67%

Tunable directional photon scattering from a pair of superconducting qubits

Poshakinskiy

Sett

et al. 2023

Nat Commun

View full text Add to dashboard Cite

show abstract

“…Recent years have witnessed successful implementations of quantum computation principles in systems featuring multiple qubits. Within this context, various studies have advocated using driven qubits as a strategy for stabilization [2,3]. The scalability of coherently interacting qubits is pivotal for achieving efficient fault-tolerant quantum computation.…”

Section: Introductionmentioning

confidence: 99%

Dissipative stability and dynamical phase transition in two driven interacting qubits

Shulga

2024

Quantum Sci. Technol.

View full text Add to dashboard Cite

We examine a two-qubit system influenced by a time-periodic external field while interacting with a Markovian bath. This scenario significantly impacts the temporal coherence characteristics of the system. By solving the evolution equation for the density matrix operator, we determine the characteristic equilibration time and analyze the concurrence parameter—a key metric for quantifying entanglement. Our findings reveal the system's ability to navigate through a dynamic phase transition. These results pave the way to designing systems of interacting qubits demonstrating robust entanglement under realistic conditions of interaction with the environment.

show abstract

“…Most dissipative state stabilization protocols proposed and implemented to date have focused on few-body entanglement stabilization, e.g. 2-qubit Bell states [18][19][20][21][22][23][24][25][26][27], 3-qubit W states [28], bosonic cat states [29,30], or small manifolds of states in bosonic systems [31][32][33]. Beyond this, the design and implementation of "scalable" dissipative stabilization protocols which can be extended to stabilize N -qubit entangled states persists as an open question.…”

Section: Introductionmentioning

confidence: 99%

“…Further, we will not consider approximate stabilization protocols, which rely on stabilizing a pure state |ψ = N (|ψ + |ξ ) which has a large overlap with the desired target state |ψ . Several works have explored such protocols for stabilizing Bell states, as the freedom available in choosing |ξ can translate into simpler interactions; for instance, only local drives and linear dissipation [25,27]. However, these protocols always have some minimum intrinsic steady-state error, ∼ | | 2 , which invariably leads to a tradeoff between the stabilization time (τ ) and achievable steady-state error (ε ∞ ) [18].…”

mentioning

confidence: 99%

Scalable entanglement stabilization with modular reservoir engineering

Doucet¹,

Govia²,

Kamal³

2023

Preprint

View full text Add to dashboard Cite

Dissipation engineering is a powerful framework for quantum state preparation and autonomous error correction in few-qubit systems. In this work, we examine the scalability of this approach and give three criteria which any dissipative state stabilization protocol should satisfy to be truly scalable as the number of qubits grows. Besides the requirement that it can be constructed in a resource-efficient manner from simple-to-engineer building blocks, a scalable protocol must also exhibit favorable scaling of the stabilization time with the increase in system size. We present a family of protocols which employ fixed-depth qubit-qubit interactions alongside engineered linear dissipation to stabilize an N -qubit W state. We find that a modular approach to dissipation engineering, with several overlapping few-qubit dissipators rather than a single N -qubit dissipator, is essential for our protocol to be scalable. With this approach, as the number of qubits increases our protocol exhibits low-degree polynomial scaling of the stabilization time and linear growth of the number of control drives in the best case. While the proposed protocol is most easily accessible with current state-of-the-art circuit-QED architectures, the modular dissipation engineering approach presented here can be readily adapted to other platforms and for stabilization of other interesting quantum states.

show abstract

Stabilizing two-qubit entanglement by mimicking a squeezed environment

Cited by 17 publications

References 49 publications

Tunable directional photon scattering from a pair of superconducting qubits

Tunable directional photon scattering from a pair of superconducting qubits

Dissipative stability and dynamical phase transition in two driven interacting qubits

Scalable entanglement stabilization with modular reservoir engineering

Contact Info

Product

Resources

About