Mixed-Species Trapped-Ion Node for Qubit Isolation and Networking
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Solution Overview
Problem
Trapped atomic ions in quantum information networks face challenges in achieving extreme isolation between memory qubits and photonic interfaces, which can disturb the quantum state, particularly due to resonant photons that destroy the coherence of memory qubits.
Innovation Solution
The use of multiple species in a trapped-ion node, specifically co-trapping 171Yb+ and 138Ba+ qubits, where 171Yb+ serves as memory qubits and 138Ba+ as communication qubits, enables local and remote entanglement through their collective motion and photonic channels, providing necessary isolation by leveraging disparate electronic transition frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If trapped atomic ions are used for quantum information networks, then long-lived identical qubit memories can be achieved, but extreme isolation between spectator qubit memories and photonic interface qubits is required to prevent resonant photons from destroying coherence
Solution Approach 1:
The system segments qubits into two distinct functional groups: memory qubits (171Yb+) and communication qubits (138Ba+). This segmentation allows each type to be optimized for its specific function while minimizing interference between them, as the different species have non-overlapping transition frequencies that prevent resonant coupling.
Solution Approach 2:
Different regions of the ion trap are assigned different qubit species with different properties. The memory qubits have long coherence times optimized for storage, while communication qubits have transition frequencies optimized for photonic coupling. This local differentiation of properties enables simultaneous optimization of both memory fidelity and communication efficiency.
2Object-affected harmful factors
If multiple species of ions are co-trapped in a single node, then isolation between memory and communication qubits is achieved through disparate transition frequencies, but the system complexity increases
Solution Approach 1:
The communication qubits (138Ba+) serve as intermediaries that mediate between the photonic channel and the memory qubits (171Yb+). They couple to photons for communication while being spectrally isolated from the memory qubits, thus acting as a buffer that enables photonic interfaces without directly exposing memory qubits to harmful resonant photons.
Solution Approach 2:
The quantum node uses a composite system of two different ion species (171Yb+ and 138Ba+) trapped together. Each species contributes different properties to the overall system, creating a composite quantum system that combines the advantages of both: long coherence times from 171Yb+ and efficient photonic coupling from 138Ba+.
3Adaptability or versatility
If communication qubits are used for photonic interfaces, then remote entanglement can be achieved, but the presence of communication qubits may disturb the quantum state of memory qubits
Solution Approach 1:
The system segments qubits into two distinct functional groups: memory qubits (171Yb+) and communication qubits (138Ba+). This segmentation allows each type to be optimized for its specific function while minimizing interference between them, as the different species have non-overlapping transition frequencies that prevent resonant coupling.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach maintains the coherence of 171Yb+ memory qubits while enabling efficient communication and quantum logic operations, with demonstrated coherence times exceeding minutes and error rates reduced to less than 10^-5, facilitating scalable quantum networking.
Implementation Method 1
Trapped atomic ions are a leading platform for quantum information networks (QINs), with long-lived identical qubit memories that can be locally entangled through their Coulomb interaction
Implementation Method 2
entangling a 138Ba+ qubit with an emitted visible photon
Data Source
AI summary
The disclosure describes aspects of using multiple species in trapped-ion nodes for quantum networking. In an aspect, a quantum networking node is described that includes multiple memory qubits, each memory qubit being based on a 171Yb+ atomic ion, and one or more communication qubits, each communication qubit being based on a 138Ba+ atomic ion. The memory and communication qubits are part of a lattice in an atomic ion trap. In another aspect, a quantum computing system having a modular optical architecture is described that includes multiple quantum networking nodes, each quantum networking node including multiple memory qubits (e.g., based on a 171Yb+ atomic ion) and one or more communication qubits (e.g., based on a 138Ba+ atomic ion). The memory and communication qubits are part of a lattice in an atomic ion trap. The system further includes a photonic entangler coupled to each of the multiple quantum networking nodes.