In the framework of standard quantum mechanics, particles are not considered to be in a superposition of times. Quantum superposition typically refers to the state of a system being a combination or superposition of multiple possible states or configurations at a given moment in time.
However, it's important to note that time is treated differently in quantum mechanics compared to space or position. In quantum mechanics, time is typically treated as a parameter that allows for the evolution of quantum states over time. The Schrödinger equation, which describes the time evolution of quantum systems, describes how the quantum state of a particle or system changes as time progresses.
While quantum systems can exhibit superposition of different states at a given moment in time, there is no direct analogy in quantum mechanics for superposition across different points in time. The time evolution of quantum states is typically described by unitary transformations that preserve the normalization of the wavefunction and reflect the deterministic evolution of the system.
However, it's worth noting that there are more speculative and advanced areas of physics, such as certain approaches to quantum gravity and quantum cosmology, where the concept of superpositions involving time has been explored. These areas of research involve attempting to reconcile quantum mechanics with general relativity and understand the behavior of the universe on cosmological scales. Nonetheless, these ideas are still under active investigation, and there is currently no widely accepted theory that incorporates time superposition within the framework of standard quantum mechanics.